2-075300-Roofing and Flashing ADD-1Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
1 of 14
SECTION 07 53 00
Membrane Roofing and Flashing
PART 1 GENERAL REQUIREMENTS
1.01. RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and Supplementary
Conditions and other Division 1 Specification Sections, apply to this Section
1.02. DESCRIPTION OF WORK
A. The full set of contract documents affects this section and such effects shall be
accommodated in the execution of the work specified herein.
B. Work Included: Provide labor, materials and equipment necessary to complete the work
of this Section, including but not limited to the following:
1 Removal of all equipment, curbs and other items on existing roof.
2 Removal and replacement of roof hatches.
3 Vacuum all stone ballast from main and lower roofs. Stones to be then part of Site
Scope.
4 Remove existing membrane from main roof and lower roofs.
5 Evaluate existing 3” polyiso. Remove & Replace as needed. Provide a Unit price/sf.
6 Replace existing wood blocking with new pt wood blocking to same depth of new
insulation around perimeter of roofs and at roof hatches, skylights and equipment
curbs.
7 Insulation:
a. Mechanically attach 7.5” of polyiso over existing 3” polyiso to entire upper roof to
acquire an R60 insulation value.
b. Taper insulation to provide positive drainage to existing roof drain locations.
c. Maintain existing insulation on lower roofs. (R60 value is to be achieved by
adding closed cell foam to underside of deck on lower roofs.
8 Mechanically attach white .060 PVC over main roof, and lower flat roofs.
9 Install .24g Kynar finish gravel stop to all roof edges. Color: to be determined.
10 Install required flashing and/or pitch pockets for (2) RTUs, skylights.
11 All PVC related flashings and terminations installed per manufacturer's specifications.
12 Install fall protection tie offs priced under allowance.
a. Scope to include spacing, anchoring, load calculations and equipment design by
a professional engineer to ensure all local, state and national regulations.
13 All roof drains to be replaced.
14 Install new roof hatches and guards at 2 existing locations.
15 Install new roof hatch and guard at 1 new location.
16 Install walk-off mats where indicated.
17 All hoisting and craning of roofing material and equipment by roofing contractor.
18 Fasteners, adhesives, and other accessories required for a complete roofing
installation.
19 All roof related debris to be disposed of by roofing contractor.
20 20 year NDL Total System Warranty.
21 All work performed to OSHA regulations and standards
A. Alternates: Not Applicable.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
2 of 14
B. Items To Be Installed Only:
1. Section 100000 MISCELLANEOUS SPECIALTIES
a. Installation of roof hatches and curbs and guards.
C. Items To Be Furnished Only: Not Applicable.
D. Related Work: The following items are not included in this Section and will be performed
under the designated Sections:
1. Section 024100 DEMOLITION
a. Disposal of removed materials.
2. Section 042000 UNIT MASONRY
a. Installation of sheet metal flashings set in masonry.
b. Parapet wall and cap repairs and re-setting.
3. Section 061000 ROUGH CARPENTRY
a. Installation of wood blocking and pt. plywood back-up.
4. Section 08 63 00 SKYLIGHTS
a. Installation of skylights on curbs.
5. Section 079200 JOINT SEALANTS
a. Caulking related to flashing set into masonry.
6. Section 221000 PLUMBING
a. Supply and installation roof drains, snaking and clearing of
roof drain lines.
1.02. REFERENCES
A. ASTM D 751 - Standard Test Methods for Coated Fabrics.
B. ASTM D 4434 - Standard Specification for Poly(Vinyl Chloride) Sheet Roofing.
C. ASTM E 108 - Standard Test Methods for Fire Tests of Roof Coverings.
D. ASTM E 119 - Standard Test Methods for Fire Tests of Building Construction and
Materials.
E. UL - Roofing Materials and Systems Directory, Roofing Systems (TGFU.R10128).
F. ASCE 7 - Minimum Design Loads For Buildings And Other Structures.
G. NRCA - The NRCA Roofing and Waterproofing Manual.
1.03. SYSTEM DESCRIPTION
A. General: Provide installed roofing membrane and base flashings that remain
watertight; do not permit the passage of water; and resist specified uplift
pressures, thermally induced movement, and exposure to weather without failure.
B. Material Compatibility: Provide roofing materials that are compatible with one
another under conditions of service and application required, as demonstrated by
roofing membrane manufacturer based on testing and field experience.
C. Physical Properties
1. Roof product must meet the requirements of type III PVC sheet roofing as
defined by ASTM D 4434 and must meet or exceed the following physical
properties.
2. Thickness: 60 mil, nominal, in accordance with ASTM D 751.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
3 of 14
3. Breaking Strengths: ≥ 390 lbf. (MD) and ≥ 438 lbf. (XMD) in accordance
with ASTM D 751, Grab Method.
4. Elongation at Break: ≥ 31% (MD) and ≥ 31% (XMD) in accordance with
ASTM D 751, Grab Method.
5. Heat Aging in accordance with ASTM D 3045: 176 °F for 56 days. No sign
of cracking, chipping or crazing. (In accordance with ASTM D 4434).
6. Factory Seam Strength: ≥ 417 lbf. in accordance with ASTM D 751, Grab
Method.
7. Tearing Strength: ≥ 132 lbf. (MD) and 163 lbf. (XMD) in accordance with
ASTM D 751, Procedure B.
8. Low Temperature Bend (Flexibility): Pass at -40 °F in accordance with
ASTM D 2136.
9. Accelerated Weathering: No cracking, checking, crazing, erosion or
chalking after 5,000 hours in accordance with ASTM G 154.
10. Linear Dimensional Change: < 0.5% in accordance with ASTM D 1204 at
176 ± 2 °F for 6 hours.
11. Water Absorption: < 1.7% in accordance with ASTM D 570 at 158 °F for
166 hours.
12. Static Puncture Resistance: ≥ 56 lbs. in accordance with ASTM D 5602.
13. Dynamic Puncture Resistance: ≥ 14.7 ft-lbf. in accordance with ASTM D
5635.
D. Cool Roof Rating Council (CRRC) Listing.
1. Membrane must be listed on CRRC website.
a. Initial Thermal Emittance: ≥ 88%
b. Initial Solar Reflectance: ≥ 87%
c. Initial Solar Reflective Index (SRI): ≥ 111
d. 3-Year Aged Solar Reflectance: ≥ 68%
e. 3-Year Aged Thermal Emittance: ≥ 84%
f. 3-Year Aged Solar Reflective Index (SRI): ≥ 82
1.04. SUBMITTALS
A. Product data: Submit manufacturer's product data, specifications and installation
and maintenance instructions for all roofing and flashing materials including
certifications and other data as may be required to show compliance with the
Contract Documents.
B. Data sheet on each product to be used, including:
1. Preparation instructions and recommendations.
2. Storage and handling requirements and recommendations.
3. Installation methods.
4. Maintenance requirements.
C. Shop Drawings: Indicate insulation pattern, overall membrane layout, field seam
locations, joint or termination detail conditions, and location of fasteners.
D. Verification Samples: For each finish product specified, two samples, representing
actual product, color, and finish.
1. 4 inch by 6 inch (102 by 150 mm) sample of roofing membrane, of color
specified.
2. Sample of roofing membrane with factory weld and T-shaped lap.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
4 of 14
3. 4 inch by 6 inch (102 mm by 150 mm) sample of walkway pad.
4. Termination bar, fascia bar with cover, drip edge and gravel stop if to be
used.
5. Each fastener type to be used for installing membrane, insulation/recover
board, termination bar and edge details.
E. Manufacturer's Certificates: Certify products meet or exceed specified
requirements.
F. Installer Certification: Certification from the roofing system manufacturer that
Installer is approved, authorized, or licensed by manufacturer to install roofing
system.
G. Manufacturer's warranties.
1.05. CONTRACTOR'S AND MANUFACTURER'S STATEMENTS
A. Contractor's Review: Accompanying manufacturer's literature and data approval
request, submit written statement signed by the General Contractor and the roofing
and flashing subcontractor stating that the Contract Drawings and Specifications
for roofing, flashing and roof insulation have been reviewed with an agent of the
manufacture of the primary roofing materials, and that he is in agreement that the
selected systems for roofing, flashing and roof insulation are proper, compatible
and adequate for the application shown, and that the conditions and details are
acceptable and not in conflict with the roofing manufacturer's requirements for 10-
year elastomeric roofing and flashing guarantee. Show, by copy of transmittal form
that copy of statement has been transmitted to manufacturer.
B. Statement of Application: Upon completion of the work of this section, submit a
statement signed by the General contractor and the roofing and flashing
subcontractor, stating that the roofing, flashing, and roof insulation installed comply
with the requirements of this section, and that installation methods complied with
the manufacturer's printed instructions and were proper and adequate for the
condition of installation and use.
C. Membrane manufacturer shall inspect the work during roof installation and furnish
copies of his inspection reports to the Architect. Reports shall be on roofing
manufacturer's standard inspection report form, dated and signed. Such inspection
shall be provided at no additional cost to the Owner.
D. Rubbish Removal: Submit description of method of rubbish control and removal
during roof removal and replacement including protection from scattering of nails,
roofing and other materials.
1.06. QUALITY ASSURANCE
A. Perform work in accordance with manufacturer's installation instructions.
B. Manufacturer Qualifications: A manufacturer specializing in the production of
PVC membranes systems and utilizing a Quality Control Manual during the
production of the membrane roofing system that has been approved by and is
inspected by Underwriters Laboratories.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
5 of 14
C. Installer Qualifications: Company specializing in installation of roofing systems
similar to those specified in this project and approved by the roofing system
manufacturer.
D. Source Limitations: Obtain components for membrane roofing system from
roofing membrane manufacturer.
E. There shall be no deviations from the roof membrane manufacturer's
specifications or the approved shop drawings without the prior written approval of
the manufacturer.
1.07. INSPECTION AND TESTING
A. An independent roofing inspector and/or testing laboratory may be engaged and
paid for by the Owner to perform inspection and testing of vapor barriers,
insulation, roofing and flashing material and systems furnished and installed under
this section.
B. Cooperate with such roofing inspector and/or testing laboratory. Furnish materials
and labor as may be required and provide for convenient access to all parts of the
work for purposes of inspection and testing.
C. Accept as find the results of all such inspection and testing.
D. If any material or system tested is not in conformance with specified requirements,
roofing and flashing subcontractor, using new approved materials, shall replace
any portion of roofing or flashing, as the Owner deems necessary.
E. Roofing and flashing subcontractor shall bear all costs for tests where materials or
systems have been found unacceptable, and all costs for replacement required due
to such unacceptability.
F. If any replacement work is required, such work shall also be subject to the terms of
this section.
1.08. REGULATORY REQUIREMENTS
A. Conform to applicable code for roof assembly wind uplift and fire hazard
requirements.
B. Fire Exposure: Provide membrane roofing materials with the following fire-test-
response characteristics. Materials shall be identified with appropriate markings
of applicable testing and inspecting agency.
1. Exterior Fire-Test Exposure:
a. Class A; ASTM E 108, for application and roof slopes indicated.
2. Fire-Resistance Ratings: Comply with ASTM E 119 for fire-resistance-
rated roof assemblies of which roofing system is a part.
3. Conform to applicable code for roof assembly fire hazard requirements.
C. Wind Uplift:
1. Roofing System Design: Provide a roofing system designed to resist
uplift pressures calculated according to the most recent edition of the
ASCE-7 Specification Minimum Design Loads for Buildings And Other
Structures.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
6 of 14
1.09. PROJECT CONDITIONS
A. Proceed with removal of existing and installation only when existing and
forecasted weather conditions permit roofing system to be installed according to
manufacturer's specification.
B. Do not apply roofing membrane during inclement weather, or to damp or frozen
deck surface or when precipitation is anticipated.
C. Do not expose materials vulnerable to water or sun damage in quantities greater
than can be weatherproofed in the same day.
D. All new and temporary construction, including equipment and accessories, shall
be secured from wind damage or blowoff.
E. Temporary waterstops shall be installed at the end of each day's work and shall
be removed before proceeding with the next day's work. Waterstops shall be
compatible with all materials and shall not emit dangerous or incompatible fumes.
F. Prior to and during application all dirt, debris and dust shall be removed from
surfaces either by vacuuming, sweeping, blowing with compressed air and/or by
similar methods.
G. The Subcontractor shall provide all necessary temporary protection and barriers
to segregate the work area and to prevent damage to adjacent areas.
H. The Subcontractor is cautioned that compounded rubber materials are
incompatible with oil-based and plastic-based cement. Creosote and "Penta"
based materials are also incompatible. The subcontractor should consult the
manufacturer with respect to material compatibility.
I. Liquid materials such as solvents and adhesives shall be stored and used away
from open flames, sparks and excess heat.
J. The building will be open to normal use during the time of construction. The
Subcontractor shall take all precautions to create as little disruption as possible
during the course of the work
K. Completed roof areas shall not be trafficked. Work shall be coordinated to
prevent this situation by working towards the roof edges and access ways. Roof
areas of higher elevation shall be completed prior to low roof areas. Should
access to completed roof areas be necessary, the Subcontractor shall provide
plywood protection for the trafficked areas.
1.10. PRE-INSTALLATION MEETING
A. Convene meeting not less than one week before starting work of this section.
B. Review methods and procedures related to roof deck construction and roofing
system including, but not limited to, the following.
1. Meet with Owner, Architect, Owner's insurer if applicable, testing and
inspecting agency representative, roofing installer, roofing system
manufacturer's representative, deck installer, and installers whose work
interfaces with or affects roofing including installers of roof accessories
and roof-mounted equipment.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
7 of 14
2. Review and finalize construction schedule and verify availability of
materials, installer's personnel, equipment, and facilities needed to make
progress and avoid delays.
3. Examine deck substrate conditions and finishes for compliance with
requirements, including flatness and fastening.
4. Review structural loading limitations of roof deck during and after roofing.
5. Review base flashings, special roofing details, roof drainage, roof
penetrations, equipment curbs, and condition of other construction that
will affect roofing system.
6. Review governing regulations and requirements for insurance and
certificates if applicable.
7. Review temporary protection requirements for roofing system during and
after installation.
8. Review roof observation and repair procedures after roofing installation.
1.11. DELIVERY, STORAGE AND HANDLING
A. Deliver roofing materials to Project site in original containers with seals unbroken
and labeled with manufacturer's name, product brand name and type, date of
manufacture, and directions for storing and mixing with other components.
B. Store liquid materials in their original undamaged containers in a clean, dry,
protected location and within the temperature range required by roofing system
manufacturer. Protect stored liquid material from direct sunlight.
C. Protect roof insulation materials from physical damage and from deterioration by
sunlight, moisture, soiling, and other sources. Store in a dry location. Comply
with insulation manufacturer's written instructions for handling, storing, and
protecting during installation.
D. Store roof materials and place equipment in a manner to avoid permanent
deflection of deck.
E. Store and dispose of solvent-based materials, and materials used with solvent-
based materials, in accordance with requirements of local authorities having
jurisdiction.
F. Protect roof insulation materials from physical damage and from deterioration by
sunlight, moisture, soiling, and other sources. Comply with insulation
manufacturer's written instructions for handling, storing, and protecting during
installation.
G. Handle and store roof materials and place equipment in a manner to avoid
permanent deflection of deck.
1.12. PROTECTION OF WORK
A. Protect other work from spillage of roofing materials and prevent materials from
entering and clogging drains and conductors.
B. Replace or restore other work which has been soiled or otherwise damaged by
the performance of the roofing and associated work.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
8 of 14
1.13. WARRANTY
A. Contractor Warranty: The contractor shall warrant the roof application with
respect to workmanship and proper application for two (2) years from the
effective date of the warranty issued by the manufacturer.
B. Manufacturer's Warranty: Must be no-dollar limit type and provide for completion
of repairs, replacement of membrane or total replacement of the roofing system
at the then-current material and labor prices throughout the life of the warranty. In
addition the warranty must meet the following criteria:
1. Warranty Period: 20 years from date issued by the manufacturer.
2. No exclusion for damage caused by ponding water.
3. No exclusion for damage caused by biological growth.
4. Issued direct from and serviced by the roof membrane manufacturer.
5. Transferable for the full term of the warranty.
PART 2 MATERIALS
2.01. MANUFACTURER
A. Basis of design:
1. Duro-Last Roofing, Inc.
B. Acceptable Manufacturers:
1. Duro-Last Roofing, Inc.
2. Sarnafil
3. Fiber-tite
2.02. ROOFING SYSTEM COMPONENTS
A. PVC Roofing Membrane: Conforming to ASTM D 4434, Type III, fabric
reinforced, PVC. Membrane properties as follows:
1. Thickness:
a. 60 mil, nominal.
2. Exposed Face Color:
a. white.
B. Accessory Materials: Provide accessory materials supplied by or approved for
use by roof system manufacturer.
1. Sheet Flashing: Manufacturer's standard sheet flashing of same material,
type, reinforcement, thickness, and color as PVC sheet membrane.
2. Factory Prefabricated Flashings: manufactured using manufacturer's
PVC membrane.
a. Parapet flashings.
b. Stack flashings.
c. Curb flashings.
d. Inside and outside corners.
3. Sealants and Adhesives: Compatible with roofing system and supplied
by roof system manufacturer.
a. Water-based adhesive.
b. Caulk.
c. Strip mastic.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
9 of 14
4. Slip Sheet: Compatible with roofing system and supplied by roof system
manufacturer.
5. Fasteners and Plates: Factory-coated steel fasteners and metal or
plastic plates meeting corrosion-resistance provisions in FMG 4470,
designed for fastening membrane and insulation to substrate. Supplied
by roof system manufacturer.
a. #14 heavy duty fasteners.
6. Termination and Edge Details: Supplied by roof system manufacturer.
a. Termination bar.
b. 2-Piece compression metal edge system.
7. Vinyl Coated Metal Flashings: Supplied by roof system manufacturer. 24
gauge, hot-dipped galvanized, grade 90 metal with a minimum of 17 mil
of PVC membrane laminated to one side.
C. Substrate Board:
1. Glass-mat-faced, water-resistant gypsum substrate conforming to ASTM
C 1177/C 1177M. Provide to:
a. ½ inch thick.
D. Substrate Board Attachment:
1. Roof system manufacture's supplied mechanical fasteners.
E. Walkways:
1. Provide non-skid, maintenance-free walkway pads in areas of heavy foot
traffic and around mechanical equipment.
a. Remove and reinstall exiting pads at same locations.
b. Remove and reinstall existing ladder to lower roof deck.
2.03. VINYL COATED METAL FLASHING AT MASONRY
A. New vinyl coated flashing at masonry is limited to replacement of existing as
indicated on drawings.
B. Vinyl Coated Metal Flashings: Supplied by roof system manufacturer. 24 gauge,
hot-dipped galvanized, grade 90 metal with a minimum of 17 mil of pvc
membrane laminated to one side.
PART 3 EXECUTION
3.01. EXAMINATION
A. Before any roofing and flashing work is begun, roof deck shall be carefully
inspected and checked for all conditions affecting application and performance.
Carefully check wood nailing strips, blocking and plywood for adequate
anchorage and proper ventilating. Defects shall be reported in writing to the
Architect and roofing work shall not proceed until defects have been corrected.
Commencement of work shall constitute acceptance of conditions of surfaces to
which insulation and roofing work are to be applied. All defects in work resulting
from such accepted surfaces shall be corrected under this section without
additional expense to the Owner.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
10 of 14
B. Decks shall be rigid, tight, clean, dry, smooth, and free from fins, sharp edges,
other defects and oily substances. Nailers at decks shall be completely fastened
and all concrete and masonry work finished prior to commencement of roofing.
Immediately before application of roofing, thoroughly inspect surfaces in manner
specified above.
C. Ensure that all openings through the roof decks for fans, vents, and other such
items have been either temporarily or permanently covered to prevent the entry
of water into the building prior to commencing the work of this section. Notify the
General Contractor of any uncovered openings and request that such openings
be covered.
D. Fill all cracks, spalls or uneven surfaces of the decks to provide a smooth finish
for installation. Allow repairs to cure prior to installing insulation. Follow
manufacturers application rates and procedures. Submit application procedures
to Architect for approval prior to construction.
E. Have sufficient materials on hand to insure immediate temporary coverage of
roof areas to maintain weather tightness as work progresses.
F. Remove all debris and discard in accordance with the municipal laws and
regulations of the City of Adams.
G. Verify that the deck surfaces are dry and free of standing water, ice or snow.
H. Verify that all roof openings or penetrations through the roof are solidly set.
I. Notify Architect of unsatisfactory preparation before proceeding.
J. Coordinate with plumbing subcontractor for clearing of drain lines and installation
of new roof drain inserts.
K. Prior to re-covering an existing roofing system, conduct an inspection of the roof
system accompanied by a representative of the membrane manufacturer or an
authorized contractor.
1. Determine required fastener type, length, and spacing.
2. Verify that moisture content of existing roofing is within acceptable limits.
3. Identify damaged areas requiring repair before installation of new
roofing.
4. Conduct core cuts as required to verify information required.
3.02. PREPARATION
A. Clean surfaces thoroughly prior to installation.
B. Prepare surfaces using the methods recommended by the manufacturer for
achieving the best result for the substrate under the project conditions.
C. Surfaces shall be clean, smooth, free of fins, sharp edges, loose and foreign
material, oil, grease, and bitumen.
D. Re-Roofing Over Existing Insulation Decking:
1. Remove all membrane and metal roof flashings down to insulation layer..
2. Remove all loose or high fasteners.
3. Repair damaged insulation.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
11 of 14
3.03. INSTALLATION
A. Install roofing system in accordance with the roof manufacturer's installation
instructions.
B. B. Separation Board: Fiberglass-faced primed roof board
1. Use only fasteners, stress plates and fastening patterns accepted for use
by the roof manufacturer. Fastening patterns must meet applicable
design requirements.
a. Install fasteners in accordance with the roof manufacturer's
requirements. Fasteners that are improperly installed must be
replaced or corrected.
b. Attach boards in parallel courses with end joints staggered 50%
and adjacent boards butted together with no gaps greater than ¼
inch (6.3 mm).
C. Roof Membrane: 60 mil, PVC thermoplastic membrane
1. Install in accordance with the roof manufacturer's requirements.
2. Use only membrane adhesive acceptable to the roof manufacturer's that
meets the applicable design requirements.
a. Water-based membrane adhesive.
3. Cut membrane to fit neatly around all penetrations and roof projections.
4. Unroll roofing membrane and positioned with a minimum 6 inch overlap.
5. Apply adhesive in accordance with the roof manufacturer's requirements.
a. Apply at the required rate in smooth, even coatings without
voids, globs, puddles or similar irregularities. Use care not to
contaminate the area of the membrane where hot air welding will
occur.
b. Follow guidelines outlined in the adhesive's Product Data Sheet.
c. Read the adhesive's Material Safety Data Sheet (MSDS) prior to
using the adhesive.
D. Seaming:
1. Weld overlapping sheets together using hot air. Minimum weld width is 1-
1/2 inches (38 mm).
2. Check welded seams for continuity and integrity by the end of each work
day. Repair all imperfections.
E. Membrane Termination/Securement: All membrane terminations shall be
completed in accordance with the membrane manufacturer's requirements.
1. Provide securement at all membrane terminations at the perimeter of
each roof level, roof section, curb flashing, skylight, expansion joint,
interior wall, penthouse, and other similar condition.
2. Provide securement at any angle change where the slope or combined
slopes exceeds two inches in one horizontal foot.
F. Flashings: Complete all flashings and terminations as indicated on the Drawings
and in accordance with the membrane manufacturer's requirements.
1. Provide securement at all membrane terminations at the perimeter of
each roof level, roof section, curb flashing, skylight, expansion joint,
interior wall, penthouse, and other similar condition.
a. Do not apply flashing over existing thru-wall flashings or weep
holes.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
12 of 14
b. Secure flashing on a vertical surfaces before the seam between
the flashing and the main roof sheet is completed.
c. Extend flashing membrane a minimum of 6 inches (152 mm)
onto the main roof sheet beyond the mechanical securement.
d. Use care to ensure that the flashing does not bridge locations
where there is a change in direction (e.g. where the parapet
meets the roof deck).
2. Penetrations:
a. Flash all pipes, supports, soil stacks, cold vents, and other
penetrations passing through the roofing membrane as indicated
on the Drawings and in accordance with the membrane
manufacturer's requirements.
b. Utilize custom prefabricated flashings supplied by the membrane
manufacturer.
c. Existing Flashings: Remove when necessary to allow new
flashing to terminate directly to the penetration.
3. Pipe Clusters and Unusual Shapes:
a. Clusters of pipes or other penetrations which cannot be sealed
with prefabricated membrane flashings shall be sealed by
surrounding them with a prefabricated vinyl-coated metal pitch
pan and pourable sealer supplied by the membrane
manufacturer.
b. Vinyl-coated metal pitch pans shall be installed, flashed and filled
with pourable sealer in accordance with the membrane
manufacturer's requirements.
c. Pitch pans shall not be used where prefabricated or field
fabricated flashings are possible.
G. Roof Drains:
1. Coordinate installation of roof drains and vents specified in Section
221000 - Plumbing.
2. Remove existing flashing and asphalt at existing drains in preparation for
sealant and membrane.
3. Provide a smooth clean surface on the mating surface between the
clamping ring and the drain base.
4. Ensure that drains run free and clear prior to roofing work.
H. Edge Details:
1. Provide edge details as indicated on the Drawings. Install in accordance
with the membrane manufacturer's requirements.
2. Seal joints between individual sections in accordance with the membrane
manufacturer's requirements.
3. Coordinate installation of metal flashing and counter flashing with other
trades: Masonry
4. Existing roof hatch, ventilators
a. Remove hatch and ventilators, etc. prior to setting membrane
termination and re install after roof edge is set..
I. Walkways: Install walkways in accordance with the membrane manufacturer's
requirements.
1. Provide walkways where indicated on the Drawings.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
13 of 14
2. Install at roof hatches, access doors, rooftop ladders and all other traffic
concentration points regardless of traffic frequency. Provided in areas
receiving regular traffic to service rooftop units or where a passageway
over the surface is required.
3. Do not install walkways over flashings or fields seams until field
inspections by the membrane manufacturer have been completed.
J. Water cut-offs: Provide water cut-offs to ensure that water does not flow beneath
the completed sections of the new roofing system.
1. Provide water cut-offs on a daily basis at the completion of work and at
the onset of inclement weather.
2. Remove water cut-offs prior to the resumption of work.
3. The integrity of the water cut-off is the sole responsibility of the roofing
contractor.
4. 4Any membrane contaminated by the cut-off material shall be cleaned or
removed.
3.04. WORKMANSHIP: FLASHINGS AND SHEET METAL WORK
A. Except as otherwise indicated comply with manufacturer's installation instructions
and recommendations and with SMACNA "Architectural Sheet Metal Manual"
and Revere Products Co., "Copper and Common Sense."
B. Edges of all sheets of uncoated copper to be soldered shall be tinned with solder
on both sides for width not less than 1-1/2 inches.
C. Sheet metal seams, unless otherwise specified or detailed, shall be flat locked
and soldered and shall finish at least 1/2 inch in width.
D. All soldering shall be done slowly with well heated coppers, to heat sheet
thoroughly and to sweat solder completely through full width of seam. Ample
solder shall be used and seam shall show at least one full inch of evenly flowed
solder. Wherever possible, all soldering shall be done in flat position. Seams on
slopes steeper than 45 degrees shall be soldered a second time.
E. Soldering shall be done with heavy soldering coppers of blunt design, properly
tinned before using. For flat seam work and gutters, they shall weigh not less
than 10 pounds per pair except, when gas-heated soldering torch is used, copper
itself shall weigh not less than 3 pounds.
3.05. PROTECTION
A. Protect installed roofing products from construction operations until completion of
project.
B. Where traffic must continue over completed roofing membrane, protect from
damage using durable materials that are not incompatible with membrane.
C. Repair or replace damaged products before Substantial Completion.
3.06. FINAL CLEANING
A. Upon the completion of the work, remove and cart away from the premises all
rubbish and accumulated materials and leave the work in a satisfactory condition.
Prospect Place Family Housing Northampton, MA
February 24, 2024 Membrane Roofing and Flashing 075300
March 29, 2024 Addendum 1
14 of 14
B. All stains and damage to the exterior finish of the building caused by faulty
workmanship or improper handling of materials in regard to the installation of
roofing shall be cleaned or removed and replaced
END OF SECTION
This Page Intentionally Left Blank