51 Main Street-Specifications PERMITPROJECT MANUAL
Smith Charities
Phase 1 Restoration
Northampton, MA
January 2021
Engineer:
Structures North Consulting Engineers, Inc.
60 Washington Street
Salem, MA 01970
978-745-6817
Please direct all project correspondence to:
John Wathne X10
jwathne@structures-north.com
Structures North Smith Charities Phase 1 Restoration
January 2021 Northampton, MA
SUMMARY OF WORK 01010-1
SECTION 01010
SUMMARY OF WORK
PART 1- GENERAL
1.1 GENERAL REQUIREMENTS
A. Portions of this project were detailed to utilize a unique and specific proprietary system to
stabilize the lower portion of the tower. The Contractor may propose or devise an
alternate system that achieves the same result as the specified proprietary system with
the same level of safety but that does not infringe upon any of the patents or restricted
trade secrets of the system specified.
B. All work shall comply with the Massachusetts State Building Code and referenced
standards.
C. All work shall be coordinated between related trades.
D. Contractor shall field verify all existing conditions and dimensions and shall be
responsible for dimensional coordination. Notify the Engineer of any and all
discrepancies.
E. The contractor shall be responsible for all temporary shoring and guying of the existing
and new structure during the work, and for temporary protection of the surrounding
environs.
F. The Contractor shall be solely responsible for all means and methods of construction
employed on this project, and for all temporary bracing, support, and protection of the
existing structure. Any sequences of work or methods indicated or implied in the contract
documents are present only as assumptions on which the design of the permanent
installations were based and are to be considered as suggested options for review by the
contractor. Following review of existing conditions and the scope of work, the contractor
shall submit his own statement of means and methods as well as schedule to the
Engineer and shall keep the Engineer abreast of all progress and the beginning and
completion of each phase or item of work.
G. The Contractor shall be solely responsible for maintaining the safety and stability of the
structure and all adjacent structures during all phases of the work, and shall correct any
defects or damage which results from his actions.
H. The Contractor shall clean-up the property at the end of each day. Maintain site in a
clean, unencumbered fashion from the end of work on Friday to the start of work on
Monday.
I. The Contractor shall protect the property, the street, sidewalk and abutters’ properties
from any water spray, spatter or windblown soil or mortar materials.
J. The Contractor shall submit a weekly schedule to the Owner for their use, along with an
overall project schedule updated on a monthly basis.
K. All work shall meet applicable requirements of the Secretary of the Interior’s Standards
for Historic Preservation. The contractor shall be responsible for treatment, protection
and restoration of all historic finishes affected by the structural work.
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SUMMARY OF WORK 01010-2
1.2 TECHNICAL SPECIFICATION SECTIONS
Section 00100 Invitation to Bid
Section 00150 Instructions to Bidders
Section 00230 Qualification Statement
Section 00400 Form for General Bid
Section 01010 Summary of Work
Section 01351 Historic Treatment Procedures
Section 02050 Structural Dismantling
Section 02051 Historic Removal and Dismantling
Section 02210 Temporary Shoring and Bracing
Section 04100 Masonry Restoration
Section 04720 Unit Cast Stone
Section 04730 Unit Brownstone
Section 07920 Joint Sealants
1.3 CONTRACT DRAWINGS
S1.1 Elevations
S2.1 Sections and Details
S2.2 Sections and Details
PART 2- PRODUCTS
2.1 PROVIDE: Products as indicated in the respective specification sections that are referenced in
the description of work.
PART 3- EXECUTION
3.1 DESCRIPTION OF WORK, MEASUREMENT AND PAYMENT:
A. General- Perform all work in accordance with the drawings and specifications under the
respective Base Bid or Alternate for this contract, which will include at least the following
items of work along with all incidental work required for the completion of these items in
conformance with this Specification and all referenced documents and drawings:
1. Protection of all structural, architectural, window, door and roofing elements and
adjacent structures to remain, as well as erection of a protection system for
passersby and to allow for safe access and egress into and out of the building at
all times.
2. All specified masonry, flashing and sealant work.
3. All necessary staging, protection and site storage.
4. Return of the premises to a clean, orderly and attractive condition following
completion of the work.
5. The following items of work shall be under the respective Base Bide or Alternate
Items on a unit cost basis, measured and paid as follows:
U1-Pinning and Grouting of Interior Brick Back-up Masonry, including inspection,
drilling and installation of helical ties, pre-wetting and gravity feeding of
restoration grout from above, measured by the square foot of interior wall
face.
U2- Re-Setting of Interior Brickwork, including removal of loose, detached
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SUMMARY OF WORK 01010-3
brickwork and setting and bonding back into place with perpendicular
headers of stainless steel ties, measured by the square foot of each re-set
wythe.
U3- Repair of Exterior Masonry Wall Cracks, including cutting, jet-cleaning,
pointing and injection with restoration grout, measured by the lineal foot.
U4- Installation of Stone Dutchmen above Keystones over window arches,
including replication with salvaged stone, re-setting and pointing.
U5- Replacement of Failed Keystones in window arches, including shoring,
removal, cleaning, replication with salvaged stone, re-setting and pointing.
U6- Replacement of Failed Windowsills, including removal, cleaning, replication
with salvaged stone, re-setting and pointing.
Unit Prices under Items U1 through U6 shall include the respective shares of
Division 1 costs. No separate increase or decrease in Division 1 costs shall be
made for changes in unit quantities, rather, they shall be included in the unit
prices themselves.
B. Base Bid- Perform the following work under the Base Bid, including all incidentals and all
general requirements of work:
1. Cutting back of brown stand stone cornice units and replacing with new bonded
cast stone dutchmen blind-pinned to the remaining stone and back-up
construction with double-tailed sock anchors and bonded with restoration grout
by the lump sum.
2. All incidental items and work that is associated with and required for the proper
completion of the above.
C. Alternate #A1- Perform the following work under the Alternate #A1, including all
incidentals and all general requirements of work:
1. Cutting back of brown stand stone pediment units and replacing with new bonded
cast stone dutchmen blind-pinned to the remaining stone and back-up
construction with double-tailed sock anchors and bonded with restoration grout
by the lump sum.
2. All incidental items and work that is associated with and required for the proper
completion of the above.
D. Alternate #A2- Perform the following work under the Alternate #A1, including all
incidentals and all general requirements of work:
1. Locally rebuilding and grouting brickwork at interior side of front cornice within
attic under item #U1 and U2.
E. Alternate #A3- Perform the following work under the Alternate #A3, including all
incidentals and all general requirements of work:
1. Repair of cracks in exterior stonework under item #U3.
2. Filling gaps over window arches under item #U4.
3. Replacement of window arch keystones under item #U5.
4. Replace failed windowsills under item #U6.
5. All incidental items and work that is associated with and required for the proper
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SUMMARY OF WORK 01010-4
completion of the above.
F. Alternate #A4- Perform the following work under the Alternate #A3, including all
incidentals and all general requirements of work:
1. Replacement of windowsills under item #U6.
2. All incidental items and work that is associated with and required for the proper
completion of the above.
END OF SECTION
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HISTORIC TREATMENT PROCEDURES 01351 - 1 of 9
SECTION 01351
HISTORIC TREATMENT PROCEDURES
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specification Sections, apply to this Section.
1.2 SUMMARY
A. This Section includes special procedures for historic treatment on Project including, but not
limited to, the following:
1. Storage and protection of existing historic materials.
2. Temporary protection of historic materials during construction.
3. Protection during application of chemicals.
4. Protection during use of heat-generating equipment.
5. Historic treatment procedures.
1.3 REFERENCES
A. Historic Quality Standard: Comply with National Park Service, U.S. Department of the Interior;
The Secretary of the Interior’s Standards for the Treatment of Historic Properties, with
Guidelines for Preserving, Rehabilitating, Restoring & Reconstructing Historic Buildings, and the
Preservation Briefs for each type of restoration and repair required for this Project.
1.4 DEFINITIONS
A. Consolidate: To strengthen loose or deteriorated materials in place.
B. Design Reference Sample: A sample that represents the Architect's prebid selection of work to
be matched; it may be existing work or work specially produced for the Project.
C. Dismantle: To disassemble or detach a historic item from a surface, or a nonhistoric item from a
historic surface, using gentle methods and equipment to prevent damage to historic items and
surfaces; disposing of items unless indicated to be salvaged or reinstalled.
D. Historic: Spaces, areas, rooms, surfaces, materials, finishes, and overall appearance that are
important to the successful restoration and reconstruction as determined by Architect.
Designated historic surfaces are indicated on Drawings.
E. Match: To blend with adjacent construction and manifest no apparent difference in material
type, species, cut, form, detail, color, grain, texture, or finish; as approved by Architect.
F. Refinish: To remove existing finishes to base material and apply new finish to match original, or
as otherwise indicated.
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G. Reinstall: To protect removed or dismantled item, repair and clean it as indicated for reuse, and
reinstall it in original position, or where indicated.
H. Remove: To take down or detach a nonhistoric item located within a historic space, area, or
room, using methods and equipment to prevent damage to historic items and surfaces;
disposing of items unless indicated to be salvaged or reinstalled.
I. Repair: To correct damage and defects, retaining existing materials, features, and finishes while
employing as little new material as possible. This includes patching, piecing-in, splicing,
consolidating, or otherwise reinforcing or upgrading materials.
J. Replace: To remove, duplicate, and reinstall entire item with new material. The original item is
the pattern for creating duplicates unless otherwise indicated.
K. Replicate: To reproduce in exact detail, materials, and finish unless otherwise indicated.
L. Reproduce: To fabricate a new item, accurate in detail to the original, and from either the same
or a similar material as the original, unless otherwise indicated.
M. Restore: To consolidate, replicate, reproduce, repair, and refinish as required to achieve the
indicated results.
N. Retain: To keep existing items that are not to be removed or dismantled.
O. Reversible: New construction work, treatments, or processes that can be removed or undone in
the future without damaging historic materials unless otherwise indicated.
P. Salvage: To protect removed or dismantled items and deliver them to Owner.
Q. Stabilize: To provide structural reinforcement of unsafe or deteriorated items while maintaining
the essential form as it exists at present; also, to reestablish a weather-resistant enclosure.
R. Strip: To remove existing finish down to base material unless otherwise indicated.
1.5 COORDINATION
A. Historic Treatment Subschedule: General Contractor to provide construction schedule
coordinating the sequencing and scheduling of historic treatment work for entire Project,
including each activity to be performed in historic spaces, areas, and rooms, and on historic
surfaces; and based on Contractor's Construction Schedule. Secure time commitments for
performing critical construction activities from separate entities responsible for historic treatment
work.
1. Schedule construction operations in sequence required to obtain best historic treatment
results.
2. Coordinate sequence of historic treatment work activities to accommodate the following:
a. Owner's continuing occupancy of portions of existing building.
b. Owner's partial occupancy of completed Work.
c. Other known work in progress.
d. Tests and inspections.
3. Detail sequence of historic treatment work, with start and end dates.
4. Utility Services: Indicate how long utility services will be interrupted. Coordinate shutoff,
capping, and continuation of utility services.
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5. Equipment Data: List gross loaded weight, axle-load distribution, and wheel-base
dimension data for mobile and heavy equipment proposed for use. Do not use such
equipment without certification from Contractor's professional engineer that the structure
can support the imposed loadings without damage.
B. Public Circulation: Coordinate historic treatment work with public circulation patterns at Project
site. Some work is near public circulation patterns. Public circulation patterns cannot be closed
off entirely, and in places can be only temporarily redirected around small areas of work. Plan
and execute the Work accordingly.
1.6 PROJECT MEETINGS FOR HISTORIC TREATMENT
A. Preliminary Historic Treatment Conference: Before starting historic treatment work, Architect will
conduct conference at Project site.
1. Attendees: In addition to representatives of Owner, Architect, and Contractor, testing
service representative, historic treatment specialists, chemical-cleaner manufacturer, and
installers whose work interfaces with or affects historic treatment shall be represented at
the meeting.
2. Agenda: Discuss items of significance that could affect progress of historic treatment
work, including review of the following:
a. Historic Treatment Subschedule: Discuss and finalize; verify availability of
materials, historic treatment specialists' personnel, equipment, and facilities
needed to make progress and avoid delays.
b. Fire-prevention plan.
c. Governing regulations.
d. Areas where existing construction is to remain and the required protection.
e. Hauling routes.
f. Sequence of historic treatment work operations.
g. Storage, protection, and accounting for salvaged and specially fabricated items.
h. Existing conditions, staging, and structural loading limitations of areas where
materials are stored.
i. Qualifications of personnel assigned to historic treatment work and assigned
duties.
j. Requirements for extent and quality of work, tolerances, and required clearances.
k. Methods and procedures related to historic treatments, including product
manufacturers' written instructions and precautions regarding historic treatment
procedures and their effects on materials, components, and vegetation.
l. Embedded work such as flashings and lintels, special details, collection of wastes,
protection of occupants and the public, and condition of other construction that
affect the Work or will affect the work.
3. Reporting: Architect will record conference results and distribute copies to everyone in
attendance and to others affected by decisions or actions resulting from conference.
B. Coordination Meetings: Conduct coordination meetings specifically for historic treatment work at
weekly intervals. Coordination meetings are in addition to specific meetings held for other
purposes, such as progress meetings and preinstallation conferences.
1. Attendees: In addition to representatives of Owner, Architect, and Contractor, each
historic treatment specialist, supplier, installer, and other entity concerned with progress
or involved in planning, coordination, or performance of historic treatment work activities
shall be represented at these meetings. All participants at conference shall be familiar
with Project and authorized to conclude matters relating to historic treatment work.
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2. Agenda: Review and correct or approve minutes of previous coordination meeting.
Review other items of significance that could affect progress of historic treatment work.
Include topics for discussion as appropriate to status of Project.
a. Historic Treatment Subschedule: Review progress since last coordination meeting.
Determine whether each schedule item is on time, ahead of schedule, or behind
schedule. Determine how construction behind schedule will be expedited with
retention of quality; secure commitments from parties involved to do so. Discuss
whether schedule revisions are required to ensure that current and subsequent
activities are completed within the Contract Time.
b. Schedule Updating: Revise Contractor's Historic Treatment Subschedule after
each coordination meeting where revisions to schedule have been made or
recognized. Issue revised schedule concurrently with report of each meeting.
c. Review present and future needs of each entity present, including review items
listed in the "Preliminary Historic Treatment Conference" Paragraph above and the
following:
1) Interface requirements of historic treatment work with other Project Work.
2) Status of submittals for historic treatment work.
3) Access to historic treatment work.
4) Effectiveness of fire-prevention plan.
5) Quality and work standards of historic treatment work.
6) Change Orders for historic treatment work.
3. Reporting: Record meeting results and distribute copies to everyone in attendance and to
others affected by decisions or actions resulting from each meeting.
1.7 MATERIALS OWNERSHIP
A. Historic items, relics, and similar objects including, but not limited to, cornerstones and their
contents, commemorative plaques and tablets, antiques, and other items of interest or value to
Owner that may be encountered or uncovered during the Work, regardless of whether they
were previously documented, remain Owner's property.
1. Carefully dismantle and salvage each item or object and protect it from damage, then
promptly deliver it to Owner where directed.
1.8 INFORMATIONAL SUBMITTALS
A. Historic Treatment Subschedule:
1. Submit historic treatment subschedule within seven days of date established for
commencement of historic treatment work.
B. Preconstruction Documentation: Show preexisting conditions of adjoining construction and site
improvements, including finish surfaces, that might be misconstrued as damage caused by
Contractor's historic treatment operations.
C. Historic Treatment Program: Submit seven days before work begins.
D. Fire-Prevention Plan: Submit seven days before work begins.
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1.9 QUALITY ASSURANCE
A. Historic Treatment Specialist Qualifications: An experienced firm regularly engaged in historic
treatments similar in nature, materials, design, and extent to this work as specified in each
section and that has completed a minimum of five recent projects with a record of successful in-
service performance that demonstrates the firm's qualifications to perform this work.
1. Field Supervisor Qualifications: Full-time supervisors experienced in historic treatment
work similar in nature, material, design, and extent to that indicated for this Project.
Supervisors shall be on Project site when historic treatment work begins and during its
progress. Supervisors shall not be changed during Project except for causes beyond the
control of the specialist firm.
a. Construct new mockups of required work whenever a supervisor is replaced.
B. Historic Treatment Program: Prepare a written plan for historic treatment for whole Project,
including each phase or process and protection of surrounding materials during operations.
Describe in detail the materials, methods, and equipment to be used for each phase of work.
Show compliance with indicated methods and procedures specified in this and other Sections.
Coordinate this whole-Project historic treatment program with specific requirements of programs
required in other historic treatment Sections.
1. Dust and Noise Control: Include locations of proposed temporary dust- and noise-control
partitions and means of egress from occupied areas coordinated with continuing on-site
operations and other known work in progress.
2. Debris Hauling: Include plans clearly marked to show debris hauling routes, turning radii,
and locations and details of temporary protective barriers.
C. Fire-Prevention Plan: Prepare a written plan for preventing fires during the Work, including
placement of fire extinguishers, fire blankets, rag buckets, and other fire-prevention devices
during each phase or process. Coordinate plan with Owner's fire-protection equipment and
requirements. Include fire-watch personnel's training, duties, and authority to enforce fire safety.
D. Safety and Health Standard: Comply with ANSI/ASSE A10.6.
1.10 STORAGE AND HANDLING OF HISTORIC MATERIALS
A. Salvaged Historic Materials:
1. Clean loose dirt and debris from salvaged historic items unless more extensive cleaning
is indicated.
2. Pack or crate items after cleaning; cushion against damage during handling. Label
contents of containers.
3. Store items in a secure area until delivery to Owner.
4. Transport items to Owner's storage area on-site.
5. Protect items from damage during transport and storage.
B. Historic Materials for Reinstallation:
1. Repair and clean historic items for reuse as indicated.
2. Pack or crate items after cleaning and repairing; cushion against damage during
handling. Label contents of containers.
3. Protect items from damage during transport and storage.
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4. Reinstall items in locations indicated. Comply with installation requirements for new
materials and equipment unless otherwise indicated. Provide connections, supports, and
miscellaneous materials to make item functional for use indicated.
C. Existing Historic Materials to Remain: Protect construction indicated to remain against damage
and soiling from construction work. Where permitted by Architect, items may be dismantled and
taken to a suitable, protected storage location during construction work and reinstalled in their
original locations after historic treatment and construction work in the vicinity is complete.
D. Storage: Catalog and store historic items within a weathertight enclosure where they are
protected from moisture, weather, condensation, and freezing temperatures.
1. Identify each item with a nonpermanent mark to document its original location. Indicate
original locations on plans, elevations, sections, or photographs by annotating the
identifying marks.
2. Secure stored materials to protect from theft.
3. Control humidity so that it does not exceed 85 percent. Maintain temperatures 5 deg F or
more above the dew point.
E. Storage Space:
1. Arrange for off-site locations for storage and protection of historic material that cannot be
stored and protected on-site. There shall be no storage of historic materials on site.
1.11 FIELD CONDITIONS
A. Size Limitations in Historic Spaces: Materials, products, and equipment used for performing the
Work and for transporting debris, materials, and products shall be of sizes that clear surfaces
within historic spaces, areas, rooms, and openings, including temporary protection, by 12
inches or more.
PART 2 - PRODUCTS - (Not Used)
PART 3 - EXECUTION
3.1 PROTECTION, GENERAL
A. Protect persons, motor vehicles, surrounding surfaces of building, building site, plants, and
surrounding buildings from harm resulting from historic treatment procedures.
1. Use only proven protection methods, appropriate to each area and surface being
protected.
2. Provide temporary barricades, barriers, and directional signage to exclude the public from
areas where historic treatment work is being performed.
3. Erect temporary barriers to form and maintain fire-egress routes.
4. Erect temporary protective covers over walkways and at points of pedestrian and
vehicular entrance and exit that must remain in service during historic treatment work.
5. Contain dust and debris generated by historic treatment work, and prevent it from
reaching the public or adjacent surfaces.
6. Provide shoring, bracing, and supports as necessary. Do not overload structural
elements.
7. Protect floors and other surfaces along hauling routes from damage, wear, and staining.
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8. Provide supplemental sound-control treatment to isolate removal and dismantling work
from other areas of the building.
B. Temporary Protection of Historic Materials:
1. Protect existing historic materials with temporary protections and construction. Do not
remove existing materials unless otherwise indicated.
2. Do not attach temporary protection to historic surfaces except as indicated as part of the
historic treatment program and approved by Architect.
C. Comply with each product manufacturer's written instructions for protections and precautions.
Protect against adverse effects of products and procedures on people and adjacent materials,
components, and vegetation.
D. Utility and Communications Services:
1. Notify Owner, Architect, authorities having jurisdiction, and entities owning or controlling
wires, conduits, pipes, and other services affected by historic treatment work before
commencing operations.
2. Disconnect and cap pipes and services as required by authorities having jurisdiction, as
required for historic treatment work.
3. Maintain existing services unless otherwise indicated; keep in service, and protect
against damage during operations. Provide temporary services during interruptions to
existing utilities.
E. Existing Drains: Prior to the start of work in an area, test drainage system to ensure that it is
functioning properly. Notify Architect immediately of inadequate drainage or blockage. Do not
begin work in an area until the drainage system is functioning properly.
1. Prevent solids such as stone or mortar residue or other debris from entering the drainage
system. Clean out drains and drain lines that become sluggish or blocked by sand or
other materials resulting from historic treatment work.
2. Protect drains from pollutants. Block drains or filter out sediments, allowing only clean
water to pass.
3.2 PROTECTION FROM FIRE
A. General: Follow fire-prevention plan and the following:
1. Comply with NFPA 241 requirements unless otherwise indicated.
2. Remove and keep area free of combustibles, including rubbish, paper, waste, and
chemicals, unless necessary for the immediate work.
a. If combustible material cannot be removed, provide fire blankets to cover such
materials.
3. Prohibit smoking by all persons within Project work and staging areas, in the building and
the entire site.
B. Heat-Generating Equipment and Combustible Materials: Comply with the following procedures
while performing work with heat-generating equipment or combustible materials, including
welding, torch-cutting, soldering, brazing, removing paint with heat, or other operations where
open flames or implements using high heat or combustible solvents and chemicals are
anticipated:
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1. Obtain Owner's approval for operations involving use of welding or other high-heat
equipment. Use of open-flame equipment is not permitted. Notify Owner at least 72
hours before each occurrence, indicating location of such work.
2. As far as practicable, restrict heat-generating equipment to shop areas or outside the
building.
3. Do not perform work with heat-generating equipment in or near rooms or in areas where
flammable liquids or explosive vapors are present or thought to be present. Use a
combustible gas indicator test to ensure that the area is safe.
4. Use fireproof baffles to prevent flames, sparks, hot gases, or other high-temperature
material from reaching surrounding combustible material.
5. Prevent the spread of sparks and particles of hot metal through open windows, doors,
holes, and cracks in floors, walls, ceilings, roofs, and other openings.
6. Fire Watch: Before working with heat-generating equipment or combustible materials,
station personnel to serve as a fire watch at each location where such work is performed.
Fire-watch personnel shall have the authority to enforce fire safety. Station fire watch
according to NFPA 51B, NFPA 241, and as follows:
a. Train each fire watch in the proper operation of fire-control equipment and alarms.
b. Prohibit fire-watch personnel from other work that would be a distraction from fire-
watch duties.
c. Cease work with heat-generating equipment whenever fire-watch personnel are
not present.
d. Have fire-watch personnel perform final fire-safety inspection each day beginning
no sooner than 30 minutes after conclusion of work at each area of Project site to
detect hidden or smoldering fires and to ensure that proper fire prevention is
maintained.
e. Maintain fire-watch personnel at each area of Project site until 60 minutes after
conclusion of daily work.
C. Fire Extinguishers, Fire Blankets, and Rag Buckets: Maintain fire extinguishers, fire blankets,
and rag buckets for disposal of rags with combustible liquids. Maintain each as suitable for the
type of fire risk in each work area. Ensure that nearby personnel and the fire-watch personnel
are trained in fire-extinguisher and blanket use.
3.3 PROTECTION DURING APPLICATION OF CHEMICALS
A. Protect motor vehicles, surrounding surfaces of building being restored, building site, plants,
and surrounding buildings from harm or damage resulting from applications of chemicals and
adhesives.
B. Cover adjacent surfaces with protective materials that are proved to resist chemicals selected
for Project unless chemicals being used will not damage adjacent surfaces as indicated in
historic treatment program. Use covering materials and masking agents that are waterproof and
UV resistant and that will not stain or leave residue on surfaces to which they are applied. Apply
protective materials according to manufacturer's written instructions. Do not apply liquid
masking agents or adhesives to painted or porous surfaces. When no longer needed, promptly
remove protective materials.
C. Do not apply chemicals during winds of sufficient force to spread them to unprotected surfaces.
D. Neutralize alkaline and acid wastes and legally dispose of off Owner's property.
E. Collect and dispose of runoff from chemical operations by legal means and in a manner that
prevents soil contamination, soil erosion, undermining of paving and foundations, damage to
landscaping, or water penetration into building interior.
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3.4 GENERAL HISTORIC TREATMENT
A. Have historic treatment work performed only by qualified historic treatment specialists.
B. Ensure that supervisory personnel are present when historic treatment work begins and during
its progress.
C. Record existing work before each procedure (preconstruction), and record progress during the
work. Use digital preconstruction documentation photographs or video recordings.
D. Perform surveys of Project Site as the Work progresses to detect hazards resulting from historic
treatment procedures.
E. Follow the procedures in subparagraphs below and procedures approved in historic treatment
program unless otherwise indicated:
1. Retain as much existing material as possible; repair and consolidate rather than replace.
2. Use additional material or structure to reinforce, strengthen, prop, tie, and support
existing material or structure.
3. Use reversible processes wherever possible.
4. Use historically accurate repair and replacement materials and techniques unless
otherwise indicated.
5. Record existing work before each procedure (preconstruction) and progress during the
work with digital preconstruction documentation photographs or video recordings.
F. Notify Architect of visible changes in the integrity of material or components whether from
environmental causes including biological attack, UV degradation, freezing, or thawing or from
structural defects including cracks, movement, or distortion.
1. Do not proceed with the work in question until directed by Architect.
G. Where missing features are indicated to be repaired or replaced, provide work with appearance
based on accurate duplications rather than on conjecture, subject to approval of Architect.
H. Where work requires existing features to be removed or dismantled and reinstalled, perform
these operations without damage to the material itself, to adjacent materials, or to the substrate.
I. Identify new and replacement materials and features with permanent marks hidden in the
completed Work to distinguish them from original materials. Record a legend of identification
marks and the locations of the items on record Drawings.
END OF SECTION
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02050-1
SECTION 02050
STRUCTURAL DISMANTLING
PART 1 - GENERAL
1.1 INCLUDED IN THIS SECTION
A. Dismantling of designated masonry, some of which is to be re-used.
B. Dismantling of additional masonry elements that have become loose.
1.2 RELATED SECTIONS
A. Section 02210 - Temporary Shoring and Bracing
B. Section 04100 - Masonry Restoration
1.3 REFERENCES
A. Comply with all similarly applicable demolition standards of the Connecticut Department
of Public Works.
B. Comply with all applicable OSHA requirements.
1.4 SUBMITTALS
A. Submit certificates attesting to legal disposal of refuse materials if requested by the
Engineer.
1.5 PROTECTION
A. Provide for the uninterrupted safety of workers and adjacent structures to remain as well
as the general public during all phases of the work. Provide warning signs, and
barricades as required to maintain a separated, safe, secure site.
B. Protect all elements which are to remain and all historic elements to be retained and/or
re-set. Do not dismantle anything other than what is specifically indicated on the contract
documents unless specifically requested to do so in writing by the Engineer.
PART 2 - PRODUCTS AND MATERIALS
2.1 PROVIDE PRODUCTS AND MATERIALS: which are incidental to the dismantling and demolition
work, disposing of these or salvaging them for re-use as best suits the project conditions.
PART 3 - EXECUTION
3.1 SITE REVIEW: Perform full review of site to verify extent of dismantling and to plan for
coordination with other trades.
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02050-2
3.2 DISMANTLE (REMOVE FROM PRESENT POSITION) THE FOLLOWING:
A. Masonry that has been designated to be removed.
B. Masonry that has loosened or shifted that is immediately contiguous to the designated
removal.
C. Gutters and flashing to allow masonry work.
3.3 DISMANTLING OPERATIONS
A. Carefully study each item to be dismantled and determine the safest, least disturbing and
potentially damaging method of disassembly.
B. Dismantle the specific items and store items designated for re-use or salvage in a safe
place.
D. Notify the Engineer immediately if any damage has occurred to any of the dismantled
items and propose appropriate methods of repair.
3.4 RETENTION OF MATERIALS
A. Retain and protect dismantled brown sandstone pediment units for use as harvesting
source for repair dutchmen.
END OF SECTION
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HISTORIC REMOVAL AND DISMANTLING 02051 - 1 of 5
SECTION 02051
HISTORIC REMOVAL AND DISMANTLING
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specification Sections, apply to this Section.
1.2 SUMMARY
A. Section includes historic treatment procedures in the form of special types of selective
demolition work for designated historic spaces, areas, rooms, and surfaces and the following
specific work:
1. Removal and disposal of existing ridge cap flashing.
2. Removal and disposal of damaged slate shingles as indicated.
3. Removal and disposal of damaged roof deck boards as indicated.
4. Removal and disposal of metal flashing as indicated.
B. Related Requirements:
1. Section 01351 "Historic Treatment Procedures" for general historic treatment
requirements.
2. Section 07315 “Slate Shingles.”
3. Section 07620 “Sheet Metal Flashing and Trim.”
1.3 DEFINITIONS
A. Dismantle: To disassemble or detach a historic item from a surface, or a nonhistoric item from a
historic surface, using gentle methods and equipment to prevent damage to historic items and
surfaces; disposing of items unless indicated to be salvaged or reinstalled.
B. Existing to Remain: Existing items that are not to be removed or dismantled, except to the
degree indicated for performing required Work.
C. Remove: To take down or detach a nonhistoric item located within a historic space, area, or
room, using methods and equipment to prevent damage to historic items and surfaces;
disposing of items unless indicated to be salvaged or reinstalled.
D. Retain: To keep existing items that are not to be removed or dismantled.
E. Salvage: To protect removed or dismantled items and deliver them to Owner.
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1.4 PRECONSTRUCTION MEETINGS
A. Preconstruction Conference: Conduct conference at Project site.
1. Review minutes of Preliminary Historic Treatment Conference that pertain to removal and
dismantling procedures and protection of historic areas and surfaces.
2. Review list of items indicated to be salvaged.
3. Verify qualifications of personnel assigned to perform removal and dismantling.
4. Inspect and discuss condition of each construction type to be removed or dismantled.
5. Review requirements of other work that depends on condition of substrates exposed by
removal and dismantling work.
6. Review methods and procedures related to removal and dismantling work, including, but
not limited to, the following:
a. Historic removal and dismantling specialist's personnel, equipment, and facilities
needed to make progress and avoid delays.
b. Materials, material application, sequencing, tolerances, and required clearances.
c. Fire prevention.
d. Coordination with building occupants.
1.5 INFORMATIONAL SUBMITTALS
A. Qualification Data: For historic removal and dismantling specialist and historic removal and
dismantling specialist's field supervisors.
B. Preconstruction Documentation: Show preexisting conditions of adjoining construction and site
improvements, including finish surfaces, that might be misconstrued as damage caused by
Contractor's removal and dismantling operations.
C. Removal and Dismantling Historic Treatment Program: Submit 30 days before work begins.
D. List of Items Indicated to Be Salvaged: Prepare a list of items indicated on Drawings to be
salvaged for Owner's use or for reinstallation. Submit 15 days before preconstruction
conference.
E. Inventory of Salvaged Items: After removal or dismantling work is complete, submit a list of
items that have been salvaged.
1. Include item description, item condition, number of items if more than one of a type, and
tag number. Include photo of item in original location.
2. As work proceeds, include on the inventory items that were indicated to be salvaged and
items of historic importance discovered during the work. Document reasons, if any, why
an item indicated to be salvaged was not salvaged.
1.6 QUALITY ASSURANCE
A. Historic Removal and Dismantling Specialist Qualifications: A qualified historic treatment
specialist. General selective demolition experience is insufficient experience for historic removal
and dismantling work.
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HISTORIC REMOVAL AND DISMANTLING 02051 - 3 of 5
B. Removal and Dismantling Historic Treatment Program: Prepare a written, detailed description of
materials, methods, equipment, and sequence of operations to be used for each phase of
removal and dismantling work, including protection of surrounding and substrate materials and
Project site.
1. Dust and Noise Control: Include locations of proposed temporary dust- and noise-control
partitions and means of egress from occupied areas coordinated with continuing on-site
operations and other known work in progress.
2. Debris Hauling: Include plans clearly marked to show debris hauling routes, turning radii,
and locations and details of temporary protective barriers.
C. Mockups: Prepare mockups of specific historic removal and dismantling procedures specified in
this Section to demonstrate aesthetic effects and to set quality standards for materials and
execution.
1. Approval of mockups does not constitute approval of deviations from the Contract
Documents contained in mockups unless Architect specifically approves such deviations
in writing.
D. Regulatory Requirements: Comply with notification regulations of authorities having jurisdiction
before beginning removal and dismantling work. Comply with hauling and disposal regulations
of authorities having jurisdiction.
1.7 FIELD CONDITIONS
A. Conditions existing at time of inspection for bidding purpose will be maintained by Owner as far
as practical.
B. Notify Architect of discrepancies between existing conditions and Drawings before proceeding
with removal and dismantling work.
C. Hazardous Materials: Hazardous materials may be present in construction affected by removal
and dismantling work.
1. Do not disturb hazardous materials or items suspected of containing hazardous
materials, except under procedures specified elsewhere in the Contract Documents.
2. If unanticipated asbestos is suspected, stop work in the area of potential hazard, shut off
fans and other air handlers ventilating the area, and rope off area until the questionable
material is identified. Reassign workers to continue work in unaffected areas. Resume
work in the area of concern after safe working conditions are verified.
D. Storage or sale of removed or dismantled items on-site is not permitted unless otherwise
indicated.
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HISTORIC REMOVAL AND DISMANTLING 02051 - 4 of 5
PART 2 - PRODUCTS - (Not Used)
PART 3 - EXECUTION
3.1 HISTORIC REMOVAL AND DISMANTLING EQUIPMENT
A. Removal Equipment: Use only hand-held tools, except as follows or unless otherwise approved
by Architect on a case-by-case basis:
1. Light jackhammers are allowed subject to Architect's approval.
2. Large air hammers are not permitted.
B. Dismantling Equipment: Use manual, hand-held tools, except as follows or otherwise approved
by Architect on a case-by-case basis:
1. Hand-held power tools and cutting torches are permitted only as submitted in the historic
treatment program. They must be adjustable so as to penetrate or cut only the thickness
of material being removed.
2. Pry bars more than 18 inches long and hammers weighing more than 2 lb are not
permitted for dismantling work.
3.2 EXAMINATION
A. Preparation for Removal and Dismantling: Examine construction to be removed or dismantled to
determine best methods to safely and effectively perform removal and dismantling work.
Examine adjacent work to determine what protective measures are necessary. Make
explorations, probes, and inquiries as necessary to determine condition of construction to be
removed or dismantled and location of utilities and services to remain that may be hidden by
construction that is to be removed or dismantled.
1. Verify that affected utilities are disconnected and capped.
2. Inventory and record the condition of items to be removed and dismantled for
reinstallation or salvage. Enter this information on the submittal of inventory of salvaged
items.
3. Before removal or dismantling of existing building elements that will be reproduced or
duplicated in final Work, make permanent record of measurements, materials, and
construction details required to make exact reproduction.
4. Engineering Survey: Engage a professional engineer to survey condition of building to
determine whether removing any element might result in structural deficiency or
unplanned collapse of any portion of structure or adjacent structures as a result of
removal and dismantling work.
B. Survey of Existing Conditions: Record existing conditions by use of preconstruction
photographs.
1. Comply with requirements specified in Section 01 32 33 "Photographic Documentation."
C. Perform surveys as the Work progresses to detect hazards resulting from historic removal and
dismantling procedures.
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HISTORIC REMOVAL AND DISMANTLING 02051 - 5 of 5
3.3 HISTORIC REMOVAL AND DISMANTLING
A. General: Have removal and dismantling work performed by a qualified historic removal and
dismantling specialist. Ensure that historic removal and dismantling specialist's field supervisors
are present when removal and dismantling work begins and during its progress.
B. Perform work according to the historic treatment program and approved mockup.
1. Perform removal and dismantling to the limits indicated.
2. Provide supports or reinforcement for existing construction that becomes temporarily
weakened by removal and dismantling work, until the Project Work is completed unless
otherwise indicated.
3. Perform cutting by hand or with small power tools wherever possible. Cut holes and slots
neatly to size required, with minimum disturbance of adjacent work.
4. Do not operate air compressors inside building unless approved by Architect in each
case.
5. Do not drill or cut columns, beams, joints, girders, structural slabs, or other structural
supporting elements, without having Contractor's professional engineer's written approval
for each location before such work is begun.
6. Dispose of removed and dismantled items off-site unless indicated to be salvaged or
reinstalled.
C. Water-Mist Sprinkling: Use water-mist sprinkling and other wet methods to control dust only with
adequate, approved procedures and equipment according to the historic treatment program to
ensure that such water does not create a hazard or adversely affect other building areas or
materials.
D. Unacceptable Equipment: Keep equipment that is not permitted for historic removal or
dismantling work away from the vicinity where such work is being performed.
E. Removing and Dismantling Items on or Near Historic Surfaces:
1. Use only dismantling equipment and procedures within 12 inches of historic surface. Do
not use pry bars. Protect historic surface from contact with or damage by tools.
2. Unfasten items in the opposite order from which they were installed.
3. Support each item as it becomes loosened to prevent stress and damage to the historic
surface.
4. Dismantle anchorages.
F. Anchorages:
1. Remove anchorages associated with removed items.
2. Dismantle anchorages associated with dismantled items.
3. In nonhistoric surfaces, patch holes created by anchorage removal or dismantling
according to the requirements for new work.
4. In historic surfaces, patch or repair holes created by anchorage removal or dismantling
according to Section that is specific to the historic surface being patched.
END OF SECTION
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SECTION 02210
TEMPORARY SHORING AND BRACING
PART 1 - GENERAL
1.1 INCLUDED IN THIS SECTION
A.Detailing and installation of all required temporary shoring, bracing and support to enable
the specified masonry reconstruction and restoration to be completed in a safe and
expedient manner.
1.2 REFERENCES
A.Comply with the following standard material specifications that apply to the materials
used.
1.3 SUBMITTALS
A.Submit the following items to the Engineer for review:
1.Drawings showing shoring, bracing, and temporary supports.
2.A written sequence of all phases of significant structural operations and related
temporary support.
1.4 QUALITY ASSURANCE
A.Comply with all referenced standards for the products employed.
B.Schedule all appropriate site visits and inspections.
PART 2 - PRODUCTS
2.1 MATERIALS AND PRODUCTS
A.Products and materials that are appropriate to the application and permitted by the
Massachusetts State Building Code.
PART 3 - EXECUTION
3.1 TEMPORARY SHORING, BRACING AND PROTECTION
A.The contractor shall be solely responsible for all means and methods of construction
employed on this project including all temporary bracing, support and protection of the
existing Structure. Contractor shall be prepared to retain the services of a
Massachusetts registered professional structural engineer at his own expense if
necessary in order to maintain safe and stable conditions on the project. Any sequences
of work or methods indicated or implied in the contract documents are present only as
assumptions on which the design of the permanent installations was based and are to be
considered as a suggested option for review by the contractor.
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B.Field Survey and Analysis:
1.Field-verify indicated shoring locations and measure all existing geometry and
note existing conditions. Locate points of attachment and support that will best
suit progress of work.
2.Perform a structural analysis of the areas to be affected by the work and
determine loads on temporary shoring, bracing and support system.
C.Design Shoring, Bracing and Protection:
1.Shoring and bracing shall be designed to maintain the stability and existing
elements without deflection during work. Design shall be in accordance with
gravity dead, live and wind load resistance requirements of the Massachusetts
State Building Code and referenced standards.
2.Shoring and bracing shall be sufficient for existing and new material loads and
anticipated construction loads.
3.Shoring and bracing shall allow for distribution of loads to supporting structure
and shall limit all movement to less than 1/16" at full loading. Stresses on
supporting structure shall not exceed safe, commonly allowable stresses for the
materials in consideration of their age and conditions. Bending members shall
allow deflections of not more than the span lengths divided by 720 at full loading.
4.Protection shall be detailed to protect the remaining structure, its contents, and
the immediate environs against damage from falling projectiles, debris and/or
soiling that is related to or a result of any of the operations that are part of this
project. This shall include barricades, shields, tarpaulins, scrims and restraining
devices, along with any other devices and structures as may be needed to
provide safe protection. All structures shall be detailed and constructed to
withstand all possible live, snow, wind and impact loads without failure.
D.Construct shoring, bracing and protection in accordance with approved submittals and
proper and standard construction practice. Work shall be installed so as not to
permanently mar or stain the exposed stone faces of the structure.
E.Maintenance: Maintain shoring, bracing and support in a safe condition during all phases
of work. Keep wood generally dry and at constant moisture content. Protect wood from
swelling or shrinking with weather and humidity fluctuations.
F.Removal: Remove all shoring and bracing after surrounding work is complete and
masonry has adequately cured to support itself. Remove all temporary inserts and clean
all contact surfaces and plug all holes per applicable requirements of Section 04500 –
Masonry Restoration.
END OF SECTION
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SECTION 04100
MASONRY RESTORATION
PART 1 - GENERAL
1.1 INCLUDED IN THIS SECTION
A.The following items of work as described in the construction documents:
1.Replacement of damaged stone units with harvested brownstone and new cast
stone.
2.Pinning and grouting of collar joint cracks.
3.Grouting of wall cracks.
1.2 SCOPE OF WORK
A.The base bid shall include all masonry work, the nature and quantities of which are
detailed and described herein and on the Contract Drawings.
B.The masonry Contractor shall be responsible for coordinating and insuring that all
flashing and weep holes are installed.
C.Portions of this project were detailed to utilize a unique and specific proprietary
system to stabilize the lower portion of the tower. The Contractor may propose or
devise an alternate system that achieves the same result as the specified proprietary
system with the same level of safety but that does not infringe upon any of the
patents or restricted trade secrets of the system specified.
1.3 RELATED SECTIONS
A.Section 02050 - Structural Dismantling
B.Section 02210 - Shoring, Bracing and Protection
C.Section 04720 – Unit Cast Stone
D.Section 04730 – Unit Brownstone
1.4 SUBMITTALS
A.Submit the following items to the Engineer for review:
1.Test reports required as per paragraph 1.5 - Quality Control.
2.Grout mix design where needed.
3.Samples of new structural pointing and patching mortars and grouts cured in
same fashion as will be applied to structure.
4.24”x24” raking (joint cutting) test/sample patches for (as preparation for
repointing work) to be provided by the Contractor at exterior and interior wall
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surfaces and located as agreed with Engineer on site. No raking or joint cutting
shall be started until samples are approved.
5.24”x24” pointing / repointing test/sample patches to be provided by the
Contractor at exterior and interior wall surfaces and located at agreed with the
Engineer on site. No repointing shall be started until samples are approved.
6.Four completed hole and plug mortar applications to simulate completed retrofit
facing tie installations.
1.6 QUALITY CONTROL
A.Comply with all referenced standards for the products employed.
B.Coordinate times of Special Inspections to comply with International Existing Building
Code.
C.During periods of cold or questionable weather, keep a log of work including air
temperature and weather conditions, work started and completed per day, and tests
taken. No work shall be done when the ambient temperature of the structure or the air is
less than 45 degrees F.
D.Produce mortar and grout samples in the form of 2" x 2” x 2” flat slabs, placed against
wooden side forms and backing, for easy removal of cured sample. Provide 8 samples
per mortar and grout type taken on different days and cured under conditions that match
field conditions to testing laboratory for compression testing. Provide at least four 2" x 2"
x 2" field cut samples of existing mortar to the testing laboratory for comparative
compression testing. Contractor shall arrange for and pay for all testing and shall submit
results at 7 days and at 28 days to the Engineer. Adjustments in mix and re-tests shall
be made as required at no additional cost to the owner. Test existing mortar samples
and trial mixes at least three weeks before commencing masonry work.
E.Masonry Contractor shall be a qualified, well-referenced brick and stone mason with at
least 10 years of experience in stone construction, repair, and restoration.
PART 2 - PRODUCTS
2.1 MASONRY UNITS
A.Cast Stone: Provided in accordance with Section 04720- Unit Cast Stone.
B.Salvaged Brownstone: Harvested from larger natural stone units and fabricated in
accordance with Section 04730- Unit Brownstone.
2.2 MORTAR AND GROUT
A.Provide mortar in accordance with ASTM C1713 “Proportion Specification” in the following
formulations. Provide other products meeting ASTM C1713 as well as crack filling grout
mixes which shall be fluidified versions of C1713 compliant mortars.
1.Mortar for exposed masonry for Setting and Pointing of reconstructed stonework
shall be shall be 1 part type I or II Portland Cement, 1 parts Hydrated Lime and 6
parts Bulked Sand. Sand shall be properly selected and blended to match the color,
texture and appearance of the existing mortar sand, and when used, Portland
Cement shall be a combination of white and gray cement that bests suits the color
matching of the existing mortar binder. Where additionally needed, up to 10% by
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mineral oxide pigment by weight of binder may be added to best match the color of
the original mortar. Pigments shall be chemically pure mineral oxides, alkali proof
and light fast, and shall be equal or equivalent to “Solomon Grind” as manufactured
by Chem Services Inc, of Springfield, IL.
2.Mortar for exposed masonry for Repointing of stonework to remain shall be shall be
1 part type I or II Portland Cement, 2 parts Hydrated Lime and 9 parts Bulked Sand.
Sand shall be properly selected and blended to match the color, texture and
appearance of the existing mortar sand, and when used, Portland Cement shall be a
combination of white and gray cement that bests suits the color matching of the
existing mortar binder. Where additionally needed, up to 10% by mineral oxide
pigment by weight of binder may be added to best match the color of the original
mortar. Pigments shall be chemically pure mineral oxides, alkali proof and light fast,
and shall be equal or equivalent to “Solomon Grind” as manufactured by Chem
Services Inc, of Springfield, IL.
3.Restoration Grout shall be equal or equivalent to VoidSpan PHLc Grout, as
supplied by VoidSpan Technologies, LLC of Salem, MA (800-966-VOID).
B.Portland Cement: Type I, II or IIA white and/or gray cement as follows: ASTM C150
complying with staining requirements of ASTM C91 for not more than 0.03% water
soluble alkali. Mortar shall show no efflorescence when cast in a 2” x 7” x ½” slab
consisting of 1 part of the cement to be used, 2 parts Ottawa plastic mortar sand and
distilled water, and subjected to a 7 day “wick test” conforming to ASTM C67.
C.Hydrated Lime: ASTM C207, Type S.
D.Fine Aggregate / Sand:
1.Sand for mortar and grout: ASTM C144, washed. “Bulk” or moisten sand before
mixing with binder (proportions based on damp sand).
a.Sand for use in exterior-exposed pointing or re-pointing mortar and for
plug and filler mortar shall match the sand of the original, exposed
mortar.
2.For surface fill: Clean, fine sand free of salts.
E.The contractor shall review the water content and any required adjustments along with
proposed products with the Engineer. Contractor shall then submit a record mortar mix
design along with product data sheets to the Engineer for verification, review and approval
before beginning any mixing or installation.
F.Thoroughly mix mortar ingredients in accordance with ASTM C270 in quantities needed for
immediate use.
G.Mix grout in accordance with ASTM C94 or thoroughly mix grout ingredients in quantities
needed for immediate use in accordance with ASTM C476 Fine or Course grout.
H.Do not use anti-freeze compounds to lower the freezing point of grout.
I.Restoration Grout: Equal or Equivalent to VoidSpan PHLc Gravity Feed Grout as
supplied by VoidSpan Technologies, LLC of Salem, MA (disclosure: VoidSpan is
owned by the same party as Structures North).
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2.3 REINFORCEMENT, ANCHORAGE AND ADHESIVE PRODUCTS
A. Equal or Equivalent to Cintec Sock Anchors shall be as manufactured by Cintec America,
available through Conspec Associates of East Haven, CT.
B. Helefix Dryfix Anchors shall be as manufactured by Halfen, USA, and available through
Conspec Associates of East Haven, CT.
C. Provide stainless steel ties and anchors for the tie-back to stone construction meeting the
requirements of ASTM A276, Type 304/316.
D. Adhesive Anchoring System for Miscellaneous Embedded Items (where indicated on the
Contract Drawings as “Adhesive Anchors”):
1. For anchorage to masonry (except as noted below under #2 or 3): Hilti HY200
Adhesive Injection System with properly sized Screen Tubes as manufactured by
the HILTI Corporation of Tulsa, OK.
2. For anchorage to large, non-porous solid masonry units (w/out crossing voids or
cavities): Hilti RE500 Adhesive Injection System as manufactured by the HILTI
Corporation of Tulsa, OK or Sikadur Injection Gel as manufactured by the Sika
Corporation of Lyndurst, NJ.
E. Adhesive Anchoring System for Miscellaneous Embedded Items (where indicated on the
Contract Drawings as “Adhesive Anchors”):
1. For anchorage to masonry (except as noted below under #2 or 3): Hilti HY20
Adhesive Injection System with properly sized Screen Tubes as manufactured by
the HILTI Corporation of Tulsa, OK.
2. For anchorage to large, non-porous solid masonry units (w/out crossing voids or
cavities): Hilti RE 500 Adhesive Injection System as manufactured by the HILTI
Corporation of Tulsa, OK or Sikadur Injection Gel as manufactured by the Sika
Corporation of Lyndurst, NJ.
3. For pinning of stone dutchmen or fragments to parent units: Sikadur Injection Gel
as manufactured by the Sika Corporation of Lyndhurst, NJ.
2.4 MISCELLANEOUS
A.Mortar Washdown Cleaner:
1.For Pigmented Mortar- Equal or equivalent to “Vanatrol” as
manufactured by ProSoCo Inc. of Lawrence, KS.
2.For Unpigmented Mortar- Equal or equivalent to “Sureclean 600” as
manufactured by ProSoCo Inc. of Lawrence, KS.
B.Helical Wall Ties shall be Helifix or equivalent as supplied by Halfen USA.
C.Sealant and Backer Rods
1.Provide closed cell backer rod at all sealant joints. Backer rod shall be carefully
sized per sealant manufacturer instructions for each joint.
2.Provide 2-component polyurethane complying with ASTM C-920 and Federal
Specification TT-S-00227E.
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3.Acceptable manufacturers: Sika, Tremco or equivalent product line.
PART 3 - EXECUTION
3.1 DISMANTLING OF DESIGNATED MASONRY
A.Mark removal lines and provide temporary support and protection to adjacent work to
remain. Maintain existing structure in safe condition at all times.
B.Evaluate each piece of stonework in place and determine the best, most gentle
method(s) of removal for each unit. Locate and cut any anchors that are holding the units
in place, providing support to the units while the anchors are being detached or cut so
that the units do not fall or become stressed. If any of the units are found to be
“headered” or irremovably locked into the back-up construction, stop removal work, brace
the unit and notify the Engineer of the condition.
3.2 RESTORATION OF EXISTING BACK-UP MASONRY TO REMAIN
A.Remove all loose masonry units, mortar and residue from surface of back-up construction
without disturbing or weakening or destabilizing the masonry. Employ a "pressure
washer" and regulate the nozzle pressure to clean but not damage the surfaces. Nozzle
pressure shall be in the range of 600 psi with a 15 degree fan at the tip.
B.Identify and remove loose units and re-set them with new mortar slushed into
surrounding voids. Add bricks as may be appropriate to re-stitch the wall to a sound,
unfragmented condition.
1.Locate damaged and/or loose brick or stone units to be removed. Pull unit(s) out
of wall with a gentle rocking action, driving wedges into surrounding joints only as
required to snap this joint off. Stones shall be removed one at a time, bricks may
be removed up to 4 at a time.
2.Set new replacement brick units into wall in orientation and locations of existing
damaged units. Pre-wet existing construction and fully butter all contact surfaces
of new units during setting, striking mortar at distance of 1” back from the ashlar
face of the masonry to allow for final tuck pointing.
C.Grout-inject cracks and small voids encountered in masonry to remain per the
requirements of this Section.
D.Fill hollow cavities encountered in existing masonry to remain with extended lime-cement
grout or mortar per the requirements of this Section.
E.Inspect all joints and rake deteriorated or softened mortar joints to a minimum depth of 1”,
or as deeply as necessary to reach sound mortar, but not to exceed one half of the
thickness of the joint without supplementary means of support. Employ tools that are
sharp and will completely cut out joints at intersections without splitting or damaging
stones. Drive hardwood shims into joints that will be cut more deeply than 1 ½” to
prevent the wall construction from shifting.
F.Moist-cure all work under a tarpaulin or plastic sheets. Following curing period, maintain
weather protection to interior of structure until exterior wall system is replaced.
G.Work under this subsection shall only be done when the ambient air, material, and
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substrate temperatures are above 40 degrees F. by 9:00 AM and rising.
3.3 INSTALLATION OF ADHISIVE ANCHORS, PINS AND RODS
A.Install Adhesive-Set pins, connectors and dowels as shown on the Contract Drawings
and as described below using the applicable Injection System.
1.Carefully drill holes of the proper oversize diameter for the screen tube (in
masonry) and for injection resin or sealants 1/8" larger in diameter than the
anchor rod or pin, or as indicated on the Drawings or specified by the
manufacturer of the injection system if different.
2.Locate and size anchors and pins in as indicated in the Contract Documents and
as needed per Engineer’s field instructions following exposure of hidden
conditions.
3.Provide embedments as noted or instructed but not less than 8” embedment at
½” diameter and larger anchors or 4” embedment at anchors of less than ½’
diameter.
4.Incrementally core-drill all holes being careful not to damage or loosen substrate
and being careful to avoid embedded metal if any.
5.Simultaneously with injection of holes, pre-butter rods’ surfaces with injection
resin so that there is a uniform coating all around the rod of between 1/16” and
1/8” in thickness and insert rods immediately thereafter.
6.Wipe off excess resin and clean out remaining hole depth. Do not allow resin to
leak out of holes and stain stone surface(s). Remove resin immediately if this
happens!
7.Monitor progress and quality of work, adjusting techniques as may be necessary
with approval of the Engineer. Check that annular space is filled around the end
of each rod following insertion. If properly installed, resin should be oozing out
beyond end of rod all around annular space, showing that the annular space and
the hole are completely filled. Supplementary injection may be necessary due to
the presence of voids.
8.Work under this subsection shall only be done when the ambient air, material,
and substrate temperatures are above 40 degrees F. by 9:00 AM and rising.
3.4 INSTALLATION OF DRY-SET WALL TIES INTO EXISTING BRICK MASONRY
A.The following work shall be performed by an experienced mason who had at least 10
years of practical experience with work on older brick and stone structures and who has
been successfully trained in the installation of the “Helifix” system. The following
requirements apply to anchoring of existing veneers and wythes to back-up masonry.
C.Carefully drill lead holes through external veneer of wall and into back-up masonry to the
depths and diameters specified in the general notes on the contract drawings and in the
spacing(s) and arrangement(s) indicated on the wall elevations or by the Architect.
1.Locate holes within the faces of masonry units so that they are at least ¾” of all free
edges of brick units, 2” from all free edges of stone units and 3” from the nearest
crack or spall.
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2.Monitor Conditions of brick as the drill is advancing into the wall. Check for vibration
or movement of brick units halfway through each by tapping with the bit. Notify the
Architect / Engineer if the brickwork feels “soft”.
3.Incline the lead holes at an angle of 30 degrees from perpendicular in the vertical and
horizontal directions. Randomly vary the direction of each lead hole over the wall
area so that all four directions have been included.
D.Anchor Installation: Install Anchors as follows:
1.Place end of “Helifix” anchor at hole and vibrate into hole using a rotary hammer with
“Helifix” installation tool that fits around the anchor to brace it against buckling during
installation.
2.Change tools during advance of anchor to successively shorter lengths but not too
short that anchor will buckle.
3.Complete anchor installation using finishing tool to set end of anchor into veneer with
1/4” to ½” recess.
4.Install anchors in quantity arrangement and size as indicated on the contract
documents following any required adjustments in lead hole diameter and following
completion of trial load test procedure.
E.Fill installation holes in exterior veneer with matching “plug mortar”.
F.Additional Limitations on Drilling: Do not drill more than ten holes on any given wall
surface until at least 5 consecutive anchors have been completely and satisfactorily
installed 3 consecutive trial load test have been successfully completed on that wall
surface. If the 5 successful installations and 3 successful load tests have not been
completed, then the lead holes may either be to small (anchors bending during
installation) or too large (anchors pulling out under load). Stop work and notify
Manufacturer’s representative and Architect to modify lead hole diameter. See Item F for
load test procedure.
F. Trial Load Test Procedure: Drill 3 initial lead holes in each type of veneer installation and
perform 3 pull-out load tests using the procedure set forth by the manufacturer and as
follows: install test anchor 3 3/4” into veneer and place test gage arou nd anchor to press
against wall surface. Place test cap on anchor and screw tight. Apply test load of at
least 250 lbs on anchor and adjust following initial creep. Sustain test load for 2 minutes
and release. Complete installation load tested anchor after completion of test.
C. Work under this subsection shall only be done when the ambient air, material, and
substrate temperatures are above 40 degrees F. by 9:00 AM and rising.
3.5 INSTALLATION OF CINTEC ANCHORS
A. Install Cintec Anchors in accordance with the following:
1. Coordinate design and installation of Cintec anchoring system with manufacturer.
a. Forward contract drawings, required load information and description of conditions to a
representative of Cintec America, Inc. and arrange site visit to observe existing
conditions and review installation.
b. Cintec America shall provide written verification of design load and installation and
shall provide additional installation requirements and instructions. Submit to Engineer
for review before proceeding with installation. Adjustments shall be made if necessary
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to the anchor design at no additional cost to the owner but no adjustments shall be
made in diameter of rod nor reduction in embedment.
c. Satisfy Cintec contractor training and certification requirements and successfully
complete at least 4 trial anchor installations in field satisfaction of a qualified Cintec
representative (unless more are required to obtain certification).
d. Successful trial installations may be used as permanent installations.
2. Install anchors in arrangement indicated on the contract drawings and by the size indicated
on the contract drawings and verified or modified by the manufacturer in accordance with
the approved procedures. Coordinate anchor rod installation and layout with layout and
installation of connected members and within required tolerances. Provide sufficient
thread length and clearance for attachments where required. Cut-off or remove grouting
ports following installation.
3.6 GROUT INJECTION OF CRACKS AND CAVITIES IN EXSTING MASONRY TO REMAIN
A.The following pertains to grout injection of structural cracks of up to 2" in width.
B.Mechanically widen outer edges of structural cracks and drill ¼” diameter holes at 6” to
12” o.c. and install grouting ports. Seal surface of crack and around ports with removable
sealant or jute. Leave bottom 4” of crack open and seal after water flushing. Removable
Crack Seal for cementitious grouting shall be placed on both sides of the wall or crack to
be injected.
C.Flood crack with water at 10 psi maximum pressure and allow deleterious materials and
any sand or masonry residue to flow out at bottom. Seal remaining drainage opening at
bottom of crack with removable Crack Seal for cementitious grouting.
D.Pressure-inject grout into crack, starting at bottom and progressing upward until all ports
are filled and plugged. Injection shall be performed within 30 minutes of water saturation
but after all free water has run out. Injection pressure shall not exceed 10 psi. Lifts shall
not exceed 48” in height.
E.Remove ports and removable Crack Seal and inspect penetration of crack. Begin
remainder of restoration work if acceptable, or re-inject if not well penetrated
F.At collar joint cracks, pre-dampen and then gravity feed grout into the tops of the cracks
in 24” max lifts until filled.
G.Work under this subsection shall only be done when the ambient air, material, and
substrate temperatures are above 40 degrees F. by 9:00 AM and rising.
3.7 REPLACEMENT OF STONEWORK
A.At bed joints, add lead shims as needed to help float large units without squeezing out
the mortar. Install stone anchors at proper alignments and stack next courses of units
properly over them. Incorporate cotton chord weeps as indicated . Tool the interior edge
of the mortar bedding at cavities to provide “shed joints” at a 1:1 slope, keeping the weep
extensions clear of mortar. Incorporate flashing where indicated, providing solid bedding
below the flashing to minimize “oil canning”.
B.Install ties and connectors to hold stones in place, looping these where indicated around
04100-9
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reinforcing steel cages, being careful not to mar the epoxy coating so as to keep the
stainless steel galvanically separated from the protected non-stainless reinforcing steel.
C.At head joints, fill the gaps between stone ends solidly with mortar, using backer rods at
the interior edges of cavity construction if needed. Add slate shims if greater than 1”
thickness, in order to minimize shrinkage and sloughing.
D.At bonded collar joints, hand rub a mortar paste slurry over the contact surfaces of the
stone to be set and pre-butter depressions which are deeper than 1/4" to provide a non-
concave surface.
E.Stones shall be re-set to within ¼” of their previous positions and surface alignment, with
individual joints’ widths along all sides within 1/8” of their cumulative average width per
stone.
F.Install all indicated stainless steel anchors, pints and ties to reinforce the cores of
buttresses and pinnacles, and to laterally tie out wythes of walls.
G.Strike outer joints at a recessed depth of 2 ½ times the joints’ widths from the
surrounding masonry and provide dovetail transitions to existing surrounding joints and to
those that are to be re-pointed or removed.
H.Conventionally mortar fill tied collar joints behind facing stones by packing sufficient stone
chinkers into the joint in order that no unchinked mortar thickness exceed 5/8”.
Alternatively, collar joints may be gravity-filled with PHLc grout. Grout may be amended
with up to 1/3 washed pea stone aggregate by volume.
I.Reconstruct reinforced cores of buttresses and pinnacles by one of the following
methods:
a.Conventionally reconstruct using original stones and sufficient chinking stones to
limit the maximum unchinked mortar thickness to 5/8”.
b.Loosely dry stack up to three feet of angular stone at a time with sufficient
pathways for the flow of grout, then gravity feed PHLc grout into the cores to fully
surround the dry-stacked stone.
J.Finish point outer surfaces of the joints to match surrounding work after not less than 24
hours from the setting of the stones and filling of the joints.
K.Work under this subsection shall only be done when the ambient air, material, and
substrate temperatures are above 40 degrees F. by 9:00 AM and rising.
3.8 RE-SETTING TOLERANCES
A.Maximum Variation from Plane of Wall: 1/4" in 10 feet or as required by elevator clearances.
B.Maximum Variation from Plumb: 1/4" per story non-cumulative, 1/2" total, or as required by
elevator clearances.
C.Maximum Variation from Level Coursing: 1/8" in 4 feet, 1/4" in 10 feet.
D.Maximum Variation of Joint Thickness: 1/8".
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3.9 PREPARATION OF JOINTS FOR REPOINTING
A.Rake mortar joints in existing construction in areas designated to be repointed to a
minimum depth of 2.5 times the mortar joint width, 1", or as deeply as necessary to reach
sound mortar (whichever is greatest), but not to exceed one half of the thickness of the
stone thickness without supplementary means of support. Employ tools that are sharp
and will completely cut out joints at intersections without splitting or damaging stones or
bricks. Raking work shall match the approved test sample.
B.Gently drive wedges or hardwood shims into wide, deep cracks in masonry where there
is a possibility that the vertical and in-plane lateral support of masonry work will be
compromised during deep raking of the joints. This should at least be done where more
than half of the length of a specific joint is removed to a depth of more than one third of
the thickness of the stone.
C.Cut flashing reglets in new or existing masonry as indicated on the Contract Drawings.
D.Wire brush clean and then pre-wet the joints and allow for the existing mortar to dry or
saturate to a dull, non-glossy finish immediately before applying new mortar.
3.10 FINISH POINTING
A.Pre-wet prepared mortar joint surfaces until they are saturated but surface dry. At
flashing reglets, verify that flashing has been fully installed and is stable.
B.Apply final "tuck" lift of tuck pointing mortar and strike-off for flush surface.
C.Install lead weathercaps at sky-facing joints as indicated.
D.Moist cure all work, spraying with a water mist and cover with damp cloth or tarpaulin.
E.Clean mortar from all surfaces following completion and curing of work.
F.Work under this subsection shall only be done when the ambient air, material, and
substrate temperatures are above 40 degrees F. by 9:00 AM and rising.
G.The Contractor shall be responsible for matching the joints of the mock-up surrounding
work and shall re-cut and replace any joints that are poorly formed or do not match the
mock-up or the surrounding work, as determined by the Engineer, at the Contractor's
own expense.
H.Moist cure all work, spraying with a water mist and cover with damp cloth or tarpaulin.
I.Chemically clean all surfaces following completion and curing of work.
J.Completed work shall match approved sample patch or shall be re-done at the
Contractor’s expense.
3.11 CLEANING AND PROTECTION OF COMPLETED MASONRY WORK
A.As work proceeds and upon completion, remove excess mortar, smears and droppings.
Clean adjacent and adjoining surface of marks arising out of execution of work in this
Section.
B.Sweep up and remove daily sand, cleaning compounds and mixtures, dirt, debris and
rubbish. Sweep or flush away nightly, all residual washed materials. Keep the premises
neat and clean at all times.
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C.After installation and pointing are completed, carefully clean all surfaces of all dirt, excess
mortar, grout splatter, stains and/or other site incident defacements. Clean soiled
surfaces using a non-acidic solution that will not harm stone or adjacent materials.
Consult stone fabricator for acceptable cleaners. Do not use wire brushes, acid or other
solutions which may cause discoloration. Use nonmetallic tools in cleaning operation.
Apply in accordance with cleaner manufacturer recommendations.
D.Mechanically remove all loose mortar and concrete splatter with hand tools without
scratching, gouging or otherwise marring the existing substrate.
E.Chemically clean stone following completion of work, and where specifically specified on
the drawings.
END OF SECTION 04100
Structures North Smith Charities Phase 1 Restoration
November 2020 Northampton, MA
UNIT CAST STONE
04720 - 1
SECTION 04720
UNIT CAST STONE
PART 1 - GENERAL
1.1 GENERAL REQUIREMENTS
A. Drawings and general provisions of the Contract, including General and
Supplementary Conditions and Division1 Specification Sections, apply to this Section.
B. Portions of this project were detailed to utilize a unique and specific proprietary system
to stabilize the lower portion of the tower. The Contractor may propose or devise an
alternate system that achieves the same result as the specified proprietary system with
the same level of safety but that does not infringe upon any of the patents or restricted
trade secrets of the system specified.
1.2 WORK INCLUDED
A. The Work of this Section includes all labor, materials, equipment and services
necessary to complete the cast stone work as shown on the drawings and specified
herein, including but not necessarily limited to the following:
1. Cast stone units for replacement of existing damaged sandstone units.
1.3 RELATED WORK
A. Masonry Restoration - Section 04100.
1.4 QUALITY ASSURANCE
A. Manufacturer Qualifications: A firm with a minimum of five (5) years experience in
manufacturing cast stone units similar to those indicated for this Project and with a
record of successful in-service performance, as well as sufficient production capacity
to manufacture required units.
B. Source Limitations for Cast Stone: Obtain cast stone units through one source from a
single manufacturer.
C. Reference Standards: Comply with the following:
1. Cast Stone Institute Technical Manual, current edition.
2. ASTM C 150; Specification for Portland Cement.
3. ASTM C 615; Specification for deformed and plain billet steel bars for concrete
reinforcement.
4. ASTM C 979 - Standard Specification for Pigments for Integrally Colored
Concrete.
Structures North Smith Charities Phase 1 Restoration
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04720 - 2
5. ASTM C 1194; Compressive strength, 6000 psi minimum for products at 28
days.
6. ASTM C 1195 or ASTM C 642: Absorption, 6% maximum for products at 28
days.
1.5 SUBMITTALS
A. Shop Drawings: Show fabrication and installation details for all cast stone units.
Include dimensions, details of anchorages and reinforcement, if any; and indication of
finished faces. Indicate type and location of reinforcement steel, wire cages and
anchors that are cast into the units.
1. The Contractor shall be responsible for fully documenting and measuring
existing designated stone units for replication in cast stone. The Contractor shall
also be responsible for working with the Engineer in order to detail the anchors
that tie the cast stone to the building.
2. The shop drawings shall show the setting mark of each unit of cast stone and its
location on the structure. The cast stone shall bear the same corresponding
setting mark on an unexposed surface.
3. Shop drawings shall show exact profiles for each cast stone unit.
4. Include building elevations showing layout of units and locations of joints and
anchors.
B. Samples:
1. Submit three 12" x 12" cast stone samples showing full range of colors and
textures proposed to match existing.
C. Material Test Reports: From a qualified testing agency indicating and interpreting test
results for compliance of cast stone with requirements indicated.
D. Qualification Data: For firms and persons specified in "Quality Assurance" Article to
demonstrate their capabilities and experience. Include lists of completed projects with
project names and addresses, names and addresses of Engineers and owners, and
other information specified.
1. Include copies of material test reports for completed projects, indicating
compliance of cast stone with ASTM C1364.
1.6 DELIVERY, STORAGE AND HANDLING
A. Pack, handle, and ship cast stone units in suitable packs or pallets.
1. Lift with wide-belt slings; do not use wire rope or ropes that might cause staining.
Move cast stone units, if required, using dollies with wood supports.
2. Store cast stone units on wood skids or pallets with non-staining, waterproof
covers. Arrange to distribute weight evenly and to prevent damage to units.
Ventilate under covers to prevent condensation.
Structures North Smith Charities Phase 1 Restoration
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04720 - 3
B. Store installation materials on elevated platforms, under cover, and in a dry location.
C. Protection:
1. Use all means necessary to protect cast stone and related materials before,
during and after installation and to protect the installed work and materials of all
other trades.
D. Replacements: In the event of damage, immediately make all repairs and
replacements necessary for Engineer’s approval, at no additional cost to the Owner.
1.7 COORDINATION
A. Coordinate production and delivery of cast stone with masonry restoration work to
minimize the need for on-site storage and to avoid delaying the Work.
PART 2 - PRODUCTS
2.1 CAST STONE COLOR AND FINISH
A. The Cast Stone used in this work shall match color, texture and variation of the
existing brown sandstone that is being replaced.
B. The samples shall be approved by the Engineer before the manufacturer shall be
required to proceed with the work.
C. Exposed surfaces, unless otherwise specified, shall exhibit a weathered appearance.
D. Models and Molds
1. Certain changes in profile, section and wash may be required in the
model/pattern phase in order to improve on the durability and water shedding
capability of the original units.
2. All models and patterns shall be prepared by skilled craftsmen in a correct and
artistic manner in strict accordance with the spirit and intent of the original units
and the contract drawings. Models shall be approved by Engineer before any
work is executed from them.
3. Provide forms and molds as required to produce finished surfaces. Accurately
construct forms that are mortar tight and of sufficient strength to provide cast
stone units of shape, lines and sizes shown.
4. Forms and molds shall be kept in good, re-usable condition for the duration of
the casting process and shall be turned over to the Church for future re-use
following completion of the work.
2.2 CAST STONE MATERIALS
A. General: Comply with ASTM C1364 and the following:
1. Portland Cement: ASTM C150, Type I White Cement
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04720 - 4
2. Fine aggregate shall be carefully graded and washed natural sands, or
manufactured granite, marble, quartz or limestone sands meeting ASTM C33,
except that gradation may vary to achieve desired finish and texture.
3. Coarse aggregate shall be carefully graded and washed natural gravel, or
crushed graded stone such as granite, marble quartz, limestone or other durable
stone meeting ASTM C33, except that gradation may vary to achieve desired
finish and texture that matches existing weathered cast stone.
4. Coloring: All colors added shall be inorganic (natural or synthetic) iron oxide
pigments meeting ASTM C979 excluding the use of a cement grade of carbon
black pigment, and shall be guaranteed by the manufacturer to be light fast and
lime proof. The amount of pigment shall not exceed ten (10) percent by weight
of the cement used.
5. Air-Entraining Admixture: ASTM C260, certified by the manufacturer to be
compatible with other admixtures used.
a. Add to mixes for units exposed to the exterior at manufacturer's
prescribed rate to result in an air content of 5 to 7 percent.
B. Reinforcement: Deformed stainless steel rods conforming to ASTM A276, Type 304.
Reinforcing rod sizes shall be as shown on approved shop drawings. The material
covering in all cases shall be at least twice the diameter of the bars. Stone shall be
fully reinforced to take all stresses including handling, temperature changes and
structural stresses.
C. Anchors/ Ties: Provide at least one stainless steel tie from the cast stone units to the
building structure for up to every 2 square feet of exposed face of cast stone unit.
Fabrications and Hardware shall conform to ASTM A276, Type 304 or 316.
2.3 CAST STONE UNITS
A. Cast stone units shall exactly match and replicate the units that they are replacing.
Measure and document existing units as needed to produce re-usable forms for
casting of each component. Match aggregate and paste color and make-up of existing
units to provide, color, texture and appearance of the original units in their un-
weathered form.
B. Provide cast stone units complying with ASTM C1364.
1. Provide units that are resistant to freezing and thawing as determined by
laboratory testing according to ASTM C666, procedure, as modified by ASTM
C1364.
C. All Cast Stone used in this work shall have a minimum compressive strength of six
thousand (6,000) lbs. per square inch and absorption of not greater than five (5)
percent when tested in accordance with ACI 704.
D. Absorption: 6 percent maximum at 28 days, per ASTM C 1195 or ASTM C 642.
E. Reinforce units as indicated and as required by ASTM C1364. Use stainless steel
reinforcement. Provide reinforcement of at least 0.25% of cross-sectional area in any
direction exceeding 12” in length.
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04720 - 5
F. Fabricate units with sharp arris and details accurately reproduced with indicated
texture on all exposed surfaces, unless otherwise indicated.
1. Slope exposed horizontal surfaces at least 1:12, unless otherwise indicated.
2. Provide drips on projecting elements, unless otherwise indicated.
G. Casting Tolerances: Maintain casting, bowing, warping and dimension tolerance to
within the following:
1. Overall dimension for height, width and length of units: Plus zero of unit
dimension to minus 1/8” in each direction.
2. Bowing or warping: Not to exceed 1/360 of the span.
2.4 FABRICATION
A. Cast stone shall cured in a totally enclosed curing room or if weather permits; yard
cure.
B Yard cure units until the sum of the mean daily temperatures for each day equals or
exceeds 350 deg F.
C. Acid etch or lightly sandblast units to remove cement film from exposed surfaces to
achieve desired finish.
D. Cast stone shall have sharp arrises to match profiles on approved shop drawings.
Provide stone with sinkages to receive anchors.
PART 3 - EXECUTION
3.1 PREPARATION
A. CLEAN CAST STONE BEFORE SETTING BY THROUGHLY SCRUBBING WITH
FIBER BRUSHES FOLLOWED BY A THROUGH DRENCHING WITH CLEAR
WATER. USE ONLY MILD CLEANING COMPOUNDS THAT CONTAIN NO CAUSTIC
CHEMICALS.
3.2 INSTALLATION
A. Installation of cast stone is specified under Section 04100 – Masonry Restoration
END OF SECTION
Structures North Smith Charities Phase 1 Restoration
January 2021 Northampton, MA
UNIT BROWNSTONE
04730 - 1
SECTION 04730
UNIT BROWNSTONE
PART 1 - GENERAL
1.1 GENERAL PROVISIONS
A. Attention is directed to the existing conditions at the site. The Contractor shall become
thoroughly familiar with the existing conditions in order to assess the scope of work
required.
B. Portions of this project were detailed to utilize a unique and specific proprietary system to
stabilize the lower portion of the tower. The Contractor may propose or devise an alternate
system that achieves the same result as the specified proprietary system with the same
level of safety but that does not infringe upon any of the patents or restricted trade secrets
of the system specified.
1.2 WORK INCLUDED
A. This Section includes the following:
1. Provide all labor, materials, equipment, and services required to complete the work
as described on the drawings, as specified in this section, and as may be required.
2. Stone Fabrication: Fabricate new brownstone units to replace the failed brownstone
units.
1.3 RELATED SECTIONS
A. Section 04100 – Masonry Restoration
1.4 QUALITY ASSURANCE
A. Manufacturer Qualifications: A firm with a minimum of five (15) years experience in
manufacturing ornamental stone units similar to those indicated for this Project and with a
record of successful in-service performance, as well as sufficient production capacity to
manufacture required units.
1.5 REFERENCE STANDARDS
A. ASTM C119: Definitions of Terms Relating to Natural Building Stones
B. ASTM C144: Aggregate for Masonry Mortar
C. ASTM C150: Portland Cement
D. ASTM C170: Compressive Strength
E. ASTM C270: Mortar for Unit Masonry
Structures North Smith Charities Phase 1 Restoration
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UNIT BROWNSTONE
04730 - 2
1.6 SUBMITTALS
A. General: Submit the following according for review by the Engineer.
1. Shop Drawings:
a. Submit setting drawings showing the numbering system that will be used to
label elements. Indicate anchor locations, diameter of holes and length and
diameter of pins for all stone resetting.
b. Submit detailed shop drawings showing dimensions and profiles of
replacement stone units. Indicate anchor locations, diameter of holes and
length and diameter of pins to be used in setting.
c. Verify and take all necessary field measurements prior to fabrication.
d. Establish the jointing in accordance with industry standards if the Contract
Drawings do not show the intent of jointing.
e. Sizes, kinds and spacing of anchors and dowels shall be engineered by shop
drawing preparer for each type of anchoring system.
2. Do not fabricate or install any items until shop drawings have been approved.
B. Product data for each product indicated including recommendations for their application
and use. Include test reports and certifications substantiating that products comply with
requirements.
C. Qualification data for firms and persons specified in the "Quality Assurance" Article to
demonstrate their capabilities and experience. Include a list of completed projects with
project names, addresses, names of Engineers and Owners, and other information
specified.
1.7 DELIVERY, STORAGE AND HANDLING
A. Pack, handle, and ship Slate units in suitable packs or pallets.
1. Lift with wide-belt slings; do not use wire rope or ropes that might cause staining.
Move stone units, if required, using dollies with wood supports.
2. Store stone units on wood skids or pallets with non-staining, waterproof covers.
Arrange to distribute weight evenly and to prevent damage to units. Ventilate under
covers to prevent condensation.
B. Store installation materials on elevated platforms, under cover, and in a dry location.
C. Protection:
1. Use all means necessary to protect stone and related materials before, during and
after installation and to protect the installed work and materials of all other trades.
D. Replacements: In the event of damage, immediately make all repairs and replacements
necessary for Engineer’s approval, at no additional cost to the Owner.
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UNIT BROWNSTONE
04730 - 3
1.8 COORDINATION
A. Coordinate production and delivery of brownstone with masonry restoration work to
minimize the need for on-site storage and to avoid delaying the Work.
PART 2 - PRODUCTS
2.1 BROWNSTONE UNITS:
A. Replacement brownstone units shall exactly match the units that they are to replace but
in their original, as-fabricated conditions.
B. Exposed Finishes and Details: Sawcut or carved finishes to match the original.
C. Source Materials: Brownstone Units shall be cut and harvested from remaining sound
portoins of much larger brownstone units that are being replaced with cast stone. Re-
used material shall be cut from salvaged material that is at least 4” from any formerly
externally exposed face.
D. All units shall be naturally bedded in their orientations, with bedding planes running in the
horizotal direction.
2.2 UNIT FABRICATION
A. Cut all stone as required accurately to shape and dimensions and full to the square with
jointing as shown or required. Cut to curvature where required. All exposed faces shall be
dressed true. Beds and joints shall be at right angles to the face and joints shall have a
uniform thickness of 3/8 inch except as required to match existing conditions. All exposed
arrises shall be in true alignment and slightly eased to prevent snipping.
B. Provide all necessary holes, slots, recesses and sinkages for accessories in accordance
with industry standard practices. Provide cramp holes or Lewis pin holes for stones that can
not be handled manually. No holes for handling devices will be allowed in exposed
surfaces. Provide all cutting and drilling of stone to accommodate other trades.
1. Incidental Cutting and Drilling: Where thickness permits, all pieces weighing over 100
pounds may have Lewis holes for lifting if desired. Lewis holes may extend no closer
than 2" from the finished face, and will not be permitted on exposed surfaces except
with written permission of the Landscape Engineer. Pieces under 4" in thickness may
have holes for C-clamps if required, on surfaces not exposed.
C. Dimensional Tolerance
1. Thickness: the variation from nominal thickness as specified shall not exceed the
following:
a. Up to 2-1/2"+/- 1/8"
2. Face Dimensions: Maximum variation in the dimension of any piece shall be 1/4 of
the specified bed joint width, however, in any case not less than +/- 1/16".
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UNIT BROWNSTONE
04730 - 4
D. Flatness Tolerances: Variation from true plane, or flat surfaces shall be determined by a 4
foot dimension in any direction on the surface. Such variations on polished, honed and fine
rubbed surfaces shall not exceed tolerances listed below or 1/3 of the specified joint width,
whichever is greater. On surfaces having other finishes, the maximum variation from true
plane shall not exceed the tolerance listed below or 1/2 of the specified joint width
whichever is greater.
1. Sawn, 4-cut, 6-cut and 8-cut finishes: 1/8"
2. Thermal and coarse stippled finishes: 3/16"
E. Beds and Joints: Pieces shall be bedded and jointed as shown on the approved shop
drawings, and bed and joint surfaces shall be cut as follows:
1. Beds and joints shall be cut or sawn full square for the specified minimum thickness
of the piece. If the thickness is greater, the remainder shall fall under square not
more than 3" in 12".
2. Provide 3/8" joints unless otherwise shown on the Drawings.
3. Provide for beds as shown on the Drawings.
F. Backs of Pieces: Backs of pieces shall be sawn or roughly dressed to approximate true
planes. Sawn backs shall be cleaned of all rust stains and free from iron particles.
Wherever shown on approved shop drawings, pieces shall be backed off to clear structural
members or other obstructions.
G. Washes and Drips shall be constant in profile throughout their length, in strict conformity
with details shown on approved shop drawings.
H. Incidental Cutting and Drilling: Where thickness permits, all pieces weighing over 100
pounds may have Lewis holes for lifting if desired. Lewis holes may extend no closer than
2" from the finished face, and will not be permitted on exposed surfaces except with written
permission of the Engineer. Pieces under 4" in thickness may have holes for C-clamps if
required, on surfaces not exposed.
I. Anchor Tolerances
1. The centers of all back anchors cut into stone shall be within +/- 1/4" of the location
specified on the shop drawings. The dimensions of all back anchor sinkages shall be
as shown on the shop drawings within a tolerance of +/- 1/16". The thickness of slots
or kerfs cut into the edge of stone for anchorage purposes shall be within +/- 1/16" of
the dimension shown on the shop drawings. The location across the stone thickness
on the centers of slots or kerfs cut into the edge of stone shall be as stated on the
shop drawings within a tolerance of +/- 1/16".
2. Depth of kerfs, rebated kerfs or anchor holes shall be as shown on the shop
drawings, but shall be allowed to vary in depth to a minimum required for anchorage
clearance and a maximum not to impact the structural integrity of the anchoring
system. In any case tolerances of -1/8" +3/8" will be allowed.
J. Shop clean brownstone at time of final fabrication.
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UNIT BROWNSTONE
04730 - 5
PART 3 - EXECUTION
3.1 PREPARATION
A. Clean brownstone before setting by thoroughly scrubbing with fiber brushes followed by a
through drenching with clear water. Use only mild cleaning compounds that contain no
caustic chemicals.
3.2 INSTALLATION
A. Installation of Unit Brownstone is specified under Section 04100 – Masonry Restoration.
END OF SECTION 04730
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JOINT SEALANTS 07920 - 1 of 7
SECTION 07920
JOINT SEALANTS
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and Division 1 Specification Sections, apply to this Section.
1.2 SUMMARY
A. Section Includes:
1. Silicone joint sealants.
2. Urethane joint sealants.
B. Related Sections include the following:
1. Section 04100 Masonry Restoration
1.3 PRECONSTRUCTION TESTING
A. Preconstruction Compatibility and Adhesion Testing: Submit to joint-sealant manufacturers, for
testing indicated below, samples of materials that will contact or affect joint sealants.
1. Use ASTM C 1087 to determine whether priming and other specific joint preparation
techniques are required to obtain rapid, optimum adhesion of joint sealants to joint
substrates.
2. Submit not fewer than eight pieces of each type of material, including joint substrates,
shims, joint-sealant backings, secondary seals, and miscellaneous materials.
3. Schedule sufficient time for testing and analyzing results to prevent delaying the Work.
4. For materials failing tests, obtain joint-sealant manufacturer's written instructions for
corrective measures including use of specially formulated primers.
5. Testing will not be required if joint-sealant manufacturers submit joint preparation data
that are based on previous testing of current sealant products for adhesion to, and
compatibility with, joint substrates and other materials matching those submitted.
1.4 PERFORMANCE REQUIREMENTS
A. Provide elastomeric joint sealants that establish and maintain watertight and airtight continuous
joint seals without staining or deteriorating joint substrates.
B. Provide joint sealants for interior applications that establish and maintain airtight and water-
resistant continuous joint seals without staining or deteriorating joint substrates.
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1.5 ACTION SUBMITTALS
A. Product Data: For each joint-sealant product indicated.
B. Samples for Initial Selection: Manufacturer's color charts consisting of strips of cured sealants
showing the full range of colors available for each product exposed to view.
C. Samples for Verification: For each type and color of joint sealant required, provide Samples
with joint sealants in 1/2-inch- wide joints formed between two 6-inch- long strips of material
matching the appearance of exposed surfaces adjacent to joint sealants.
D. Joint-Sealant Schedule: Include the following information:
1. Joint-sealant application, joint location, and designation.
2. Joint-sealant manufacturer and product name.
3. Joint-sealant formulation.
4. Joint-sealant color.
1.6 INFORMATIONAL SUBMITTALS
A. Product Certificates: For each type of joint sealant and accessory, signed by product
manufacturer.
B. Qualification Data: For Installer.
C. Compatibility and Adhesion Test Reports: From sealant manufacturer, indicating the following:
1. Materials forming joint substrates and joint-sealant backings have been tested for
compatibility and adhesion with joint sealants.
2. Interpretation of test results and written recommendations for primers and substrate
preparation needed for adhesion.
D. Product Test Reports: Based on comprehensive testing of product formulations performed by a
qualified testing agency, indicating that sealants comply with requirements.
E. Preconstruction Compatibility and Adhesion Test Reports: From sealant manufacturer,
indicating the following:
1. Materials forming joint substrates and joint-sealant backings have been tested for
compatibility and adhesion with joint sealants.
2. Interpretation of test results and written recommendations for primers and substrate
preparation needed for adhesion.
F. Warranties: Special warranties specified in this Section.
1.7 QUALITY ASSURANCE
A. Installer Qualifications: Manufacturer's authorized Installer who is approved or licensed for
installation of elastomeric sealants required for this Project.
B. Source Limitations: Obtain each type of joint sealant through one source from a single
manufacturer.
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C. Product Testing: Test joint sealants using a qualified testing agency.
1. Testing Agency Qualifications: An independent testing agency qualified according to
ASTM C 1021 to conduct the testing indicated.
2. Test according to SWRI's Sealant Validation Program for compliance with requirements
specified by reference to ASTM C 920 for adhesion and cohesion under cyclic
movement, adhesion-in-peel, and indentation hardness.
D. Mockups: Build mockups incorporating sealant joints, as follows, to verify selections made
under sample submittals and to demonstrate aesthetic effects and set quality standards for
materials and execution:
1. Joints in mockups of assemblies specified in other Sections that are indicated to receive
elastomeric joint sealants, which are specified by reference to this Section.
2. Each type of sealant and joint substrate indicated.
E. Preinstallation Conference: Conduct conference at Project site.
1.8 PROJECT CONDITIONS
A. Do not proceed with installation of joint sealants under the following conditions:
1. When ambient and substrate temperature conditions are outside limits permitted by joint-
sealant manufacturer or are below 40 deg F.
2. When joint substrates are wet.
3. Where joint widths are less than those allowed by joint-sealant manufacturer for
applications indicated.
4. Contaminants capable of interfering with adhesion have not yet been removed from joint
substrates.
1.9 WARRANTY
A. Special Installer's Warranty: Installer's standard form in which Installer agrees to repair or
replace elastomeric joint sealants that do not comply with performance and other requirements
specified in this Section within specified warranty period.
1. Warranty Period: Two years from date of Substantial Completion.
B. Special Manufacturer's Warranty: Manufacturer's standard form in which elastomeric sealant
manufacturer agrees to furnish elastomeric joint sealants to repair or replace those that do not
comply with performance and other requirements specified in this Section within specified
warranty period.
1. Warranty Period: Five years from date of Substantial Completion.
C. Special warranties specified in this Article exclude deterioration or failure of elastomeric joint
sealants from the following:
1. Movement of the structure resulting in stresses on the sealant exceeding sealant
manufacturer's written specifications for sealant elongation and compression caused by
structural settlement or errors attributable to design or construction.
2. Disintegration of joint substrates from natural causes exceeding design specifications.
3. Mechanical damage caused by individuals, tools, or other outside agents.
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4. Changes in sealant appearance caused by accumulation of dirt or other atmospheric
contaminants.
PART 2 - PRODUCTS
2.1 MATERIALS, GENERAL
A. Compatibility: Provide joint sealants, backings, and other related materials that are compatible
with one another and with joint substrates under conditions of service and application, as
demonstrated by joint-sealant manufacturer, based on testing and field experience.
B. Liquid-Applied Joint Sealants: Comply with ASTM C 920 and other requirements indicated for
each liquid-applied joint sealant specified, including those referencing ASTM C 920
classifications for type, grade, class, and uses related to exposure and joint substrates.
C. Stain-Test-Response Characteristics: Where sealants are specified to be nonstaining to porous
substrates, provide products that have undergone testing according to ASTM C 1248 and have
not stained porous joint substrates indicated for Project.
D. Colors of Exposed Joint Sealants: As selected by Architect from manufacturer's full range.
2.2 URETHANE JOINT SEALANTS
A. Single-Component, Nonsag, Urethane Joint Sealant: ASTM C 920, Type S, Grade NS,
Class 25, for Use NT.
1. Products: Subject to compliance with requirements, provide one of the following:
a.BASF Corporation-Construction Systems; MasterSeal NP 1.
b. Pecora Corporation; Dynatrol I-XL.
c. Sherwin Williams; Loxon 1K Smooth.
d. Tremco; Dymonic.
B. Multicomponent, Nonsag, Urethane Joint Sealant: ASTM C 920, Type M, Grade NS, Class 50,
for Use NT.
1. Products: Subject to compliance with requirements, provide one of the following:
a.BASF Corporation-Construction Systems; MasterSeal NP 2.
b. Pecora Corporation; Dynatrol II.
c. Sherwin Williams; Loxon 2K NS.
d. Tremco; Dymeric 240 FC.
2.3 JOINT-SEALANT BACKING
A. General: Provide sealant backings of material and type that are nonstaining; are compatible
with joint substrates, sealants, primers, and other joint fillers; and are approved for applications
indicated by sealant manufacturer based on field experience and laboratory testing.
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B. Cylindrical Sealant Backings: ASTM C 1330, Type C (closed-cell material with a surface skin)
as approved in writing by joint-sealant manufacturer for joint application indicated, and of size
and density to control sealant depth and otherwise contribute to producing optimum sealant
performance.
C. Bond-Breaker Tape: Polyethylene tape or other plastic tape recommended by sealant
manufacturer for preventing sealant from adhering to rigid, inflexible joint-filler materials or joint
surfaces at back of joint where such adhesion would result in sealant failure. Provide self-
adhesive tape where applicable.
2.4 MISCELLANEOUS MATERIALS
A. Primer: Material recommended by joint-sealant manufacturer where required for adhesion of
sealant to joint substrates indicated, as determined from preconstruction joint-sealant-substrate
tests and field tests.
B. Cleaners for Nonporous Surfaces: Chemical cleaners acceptable to manufacturers of sealants
and sealant backing materials, free of oily residues or other substances capable of staining or
harming joint substrates and adjacent nonporous surfaces in any way, and formulated to
promote optimum adhesion of sealants to joint substrates.
C. Masking Tape: Nonstaining, nonabsorbent material compatible with joint sealants and surfaces
adjacent to joints.
PART 3 - EXECUTION
3.1 EXAMINATION
A. Examine joints indicated to receive joint sealants, with Installer present, for compliance with
requirements for joint configuration, installation tolerances, and other conditions affecting joint-
sealant performance.
B. Proceed with installation only after unsatisfactory conditions have been corrected.
3.2 PREPARATION
A. Surface Cleaning of Joints: Clean out joints immediately before installing joint sealants to
comply with joint-sealant manufacturer's written instructions and the following requirements:
1. Remove all foreign material from joint substrates that could interfere with adhesion of
joint sealant, including dust, paints (except for permanent, protective coatings tested and
approved for sealant adhesion and compatibility by sealant manufacturer), old joint
sealants, oil, grease, waterproofing, water repellents, water, surface dirt, and frost.
2. Clean porous joint substrate surfaces by brushing, grinding, blast cleaning, mechanical
abrading, or a combination of these methods to produce a clean, sound substrate
capable of developing optimum bond with joint sealants. Remove loose particles
remaining after cleaning operations above by vacuuming or blowing out joints with oil-free
compressed air. Porous joint substrates include the following:
a. Concrete.
b. Masonry.
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3. Remove laitance and form-release agents from concrete.
4. Clean nonporous surfaces with chemical cleaners or other means that do not stain, harm
substrates, or leave residues capable of interfering with adhesion of joint sealants.
Nonporous joint substrates include the following:
a. Metal.
b. Glass.
c. Porcelain enamel.
d. Glazed surfaces of ceramic tile.
B. Joint Priming: Prime joint substrates, where recommended in writing by joint-sealant
manufacturer, based on preconstruction joint-sealant-substrate tests or prior experience. Apply
primer to comply with joint-sealant manufacturer's written instructions. Confine primers to areas
of joint-sealant bond; do not allow spillage or migration onto adjoining surfaces.
C. Masking Tape: Use masking tape where required to prevent contact of sealant with adjoining
surfaces that otherwise would be permanently stained or damaged by such contact or by
cleaning methods required to remove sealant smears. Remove tape immediately after tooling
without disturbing joint seal.
3.3 INSTALLATION OF JOINT SEALANTS
A. General: Comply with joint-sealant manufacturer's written installation instructions for products
and applications indicated, unless more stringent requirements apply.
B. Sealant Installation Standard: Comply with recommendations in ASTM C 1193 for use of joint
sealants as applicable to materials, applications, and conditions indicated.
C. Install sealant backings of type indicated to support sealants during application and at position
required to produce cross-sectional shapes and depths of installed sealants relative to joint
widths that allow optimum sealant movement capability.
1. Do not leave gaps between ends of sealant backings.
2. Do not stretch, twist, puncture, or tear sealant backings.
3. Remove absorbent sealant backings that have become wet before sealant application
and replace them with dry materials.
D. Install bond-breaker tape behind sealants where sealant backings are not used between
sealants and backs of joints.
E. Install sealants using proven techniques that comply with the following and at the same time
backings are installed:
1. Place sealants so they directly contact and fully wet joint substrates.
2. Completely fill recesses in each joint configuration.
3. Produce uniform, cross-sectional shapes and depths relative to joint widths that allow
optimum sealant movement capability.
F. Tooling of Nonsag Sealants: Immediately after sealant application and before skinning or
curing begins, tool sealants according to requirements specified below to form smooth, uniform
beads of configuration indicated; to eliminate air pockets; and to ensure contact and adhesion of
sealant with sides of joint.
1. Remove excess sealant from surfaces adjacent to joints.
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2. Use tooling agents that are approved in writing by sealant manufacturer and that do not
discolor sealants or adjacent surfaces.
3. Provide concave joint configuration per Figure 5A in ASTM C 1193, unless otherwise
indicated.
3.4 CLEANING
A. Clean off excess sealant or sealant smears adjacent to joints as the Work progresses by
methods and with cleaning materials approved in writing by manufacturers of joint sealants and
of products in which joints occur.
3.5 PROTECTION
A. Protect joint sealants during and after curing period from contact with contaminating substances
and from damage resulting from construction operations or other causes so sealants are without
deterioration or damage at time of Substantial Completion. If, despite such protection, damage
or deterioration occurs, cut out and remove damaged or deteriorated joint sealants immediately
so installations with repaired areas are indistinguishable from original work.
END OF SECTION