079200MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
07 92 00 - 1
SECTION 07 92 00
JOINT SEALANTS
PART 1 - GENERAL
1.01 DESCRIPTION OF WORK
A. Provide all joint sealer Work as indicated on the Drawings, as required for the completed
Work, and as specified herein. This Section includes joint sealants for the following
applications:
1. Exterior joints in the following vertical surfaces and horizontal non traffic
surfaces:
a. Perimeter joints at all roofing terminations as indicated on the drawings
b. Perimeter joints between existing exterior frames in doors, windows and
louvers where indicated
c. Joints between new and existing metal panels and trims.
d. Joints between conduit and pipe penetrations through metal panels and
roofing membrane.
. e. Joints around flanges of scuppers, downspouts and trims
f. Other joints where indicated on drawings
1.02 REFERENCES
A. References and industry standards listed in this Section are applicable to the Work.
Unless more restrictive criteria or differing requirements are explicitly stated in the
Specifications, or mandated by governing codes or regulations, the recommendations,
suggestions, and requirements described in the referenced standards shall be deemed
mandatory and applicable to the Work
1. American Society for Testing and Materials (ASTM)
1.03 SUBMITTALS
A. Product Data
Catalog sheets, specifications, and installation instructions for each product specified
except miscellaneous materials.
B. Samples for Initial Selection:
1. For general purpose use around windows and at relieving angles, Colors of
Exposed Joint Sealants: Match Architect's samples. Provide custom colors as
specified.
2. For all other uses: provide Manufacturer’s color charts consisting of strips of
cured sealants showing the full range of Manufacturer’s standard colors available
for each product exposed to view.
MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
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C. Samples for Verification: For each type and color of joint sealant required, provide
Samples with joint sealants in 1/2-inch-(13-mm-) wide joints formed between two 6-inch-
(150-mm-) long strips of material matching the appearance of exposed surfaces adjacent
to joint sealants
D. Quality Control Submittals
1. Product Certificates: For each type of joint sealant and accessory, signed by
product manufacturer.
2. Installer's Qualifications Data: Affidavit required under Quality Assurance Article.
3. Company Field Advisor Data: Name, business address, and telephone number of
Company Field Advisor.
4. Test Results
a. Sealant manufacturer’s test reports certifying compatibility with all
contiguous materials.
b. Sealant manufacturer’s test reports certifying that the sealant will not
stain contiguous materials.
c. The results of field adhesion testing.
1.04 QUALITY ASSURANCE
A. Installer's Qualifications
The persons installing the sealants and their supervisor shall be personally experienced
in the installation of sealants and shall have been regularly employed by a company
engaged in the installation of sealants for a minimum of two years.
1. Furnish a letter from the sealant manufacturer, stating that the Installer is
authorized to install the manufacturer's sealant materials.
B. Container Labels
Include manufacturer's name, trade name of product, kind of material, federal
specification number (if applicable), expiration date (if applicable), and packaging date or
batch number.
1.05 DELIVERY, STORAGE, AND HANDLING
A. Deliver, store, and handle joint sealer materials as recommended by the Manufacturer, to
protect from damage.
1.06 PROJECT CONDITIONS
A. Environmental Requirements
1. Temperature: Unless otherwise approved or recommended in writing by the
sealant manufacturer, do not install sealants at temperatures below 40 degrees F
or above 85 degrees F.
MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
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2. Humidity and Moisture: Do not install the Work of this Section under conditions
that are detrimental to the application, curing, and performance of the materials.
3. Ventilation: Provide sufficient ventilation wherever sealants, primers, and other
similar materials are installed in enclosed spaces. Follow manufacturer's
recommendations.
4. Do not proceed with installation of joint sealants under the following conditions
a. When joint substrates are wet.
b. Where joint widths are less than those allowed by joint sealant
manufacturer for applications indicated.
c. Where joint widths are less than those allowed by joint-sealant
manufacturer for applications indicated.
d. Contaminants capable of interfering with adhesion have not yet been
removed from joint substrates.
e. Surfaces are frozen.
f. Surfaces are superheated by the sun.
B. Protection
1. Protect all surfaces adjacent to sealants with non-staining removable tape or
other approved covering to prevent soiling or staining.
2. Protect all other surfaces in the Work area with tarps, plastic sheets, or other
approved covering to prevent defacement from droppings.
3. Protect any painted surfaces which are not included in the Work from impact or
damage.
PART 2 - PRODUCTS
2.01 MANUFACTURERS
A. General Electric Co., Waterford, NY 12188
B. Dow Corning Corp., Midland, Michigan 48686
C. Pecora Corp., Harleyville, PA
D. ChemRex Inc. - Sonneborn, Shakopee, MN 55379
E. Tremco Sealing and Coatings,Wading River, NY 11792
F. Bostik, Midland, MA 01949
G. Sika Corporation, Lyndhurst, NJ 07071
2.02 SEALANTS
MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
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A. Type 1 Sealant - For general use around windows, door frames, louvers, general pipe
penetrations and flashings.
One-part silicone sealant; ASTM C920 classifications type S, grade NS, class 25, uses
NT, M, G, A and O: Pecora 890; Tremco Spectrum-1 or Sika’s SikaSil WS 295.
Provide custom colors for use around window perimeters, to match window frame or
masonry, or other colors as determined by the Architect.
B. Type 2 Sealant (for concealed bedding only).
One-part butyl rubber sealant; Pecora's BC-158, PTI's 707, Bostik's Chem-Calk 300, or
Tremco Butyl.
C. Type 3 Sealant (use at high temperature applications, e.g., gas flues)
One-part silicone sealant for high temperature; ASTM C920 classifications type S, grade
NS, class 25, uses NT, M, G, and A: Dow Corning's Silastic 726 RTV, General Electric's
RTV 106, or Tremco Spectrem 1.
2.03 JOINT FILLERS
A. Elastomeric Tubing Sealant Backings: (for precast panel joints not compatible with
Silicone Sealants): Neoprene, butyl or EPDM tubing complying with ASTM D 1056,
nonabsorbent to water and gas, and capable of remaining resilient at temperatures down
to minus 26 deg F (minus 32 deg C). Provide products with low compression set and of
size and shape to provide a secondary seal, to control sealant depth, and to otherwise
contribute to optimum sealant performance.
ASTM D 1056, Class SC (oil resistant and medium swell), 2 to 5 psi compression
deflection.
B. Expanded Polyethylene Joint Filler (for existing joints)
Flexible, compressible, closed-cell polyethylene of not less than 10 psi compression
deflection (25 percent).
C. Closed-Cell Polyurethane or Closed-Cell Expanded polyethylene Joint Filler (for all cast-
in-place concrete work).
Resilient, compressible, semi-rigid; W.R. Meadow's Ceramar; A. C. Horn's Closed Cell
Plastic Foam Filler, Code 5401; Sonneborn's Sonoflex F.
D. ASTM D1056, Class RE41 (for masonry joints) where shown on the Drawings.
E. Filler Sealant (for Parapet Expansion Joints)
Polybutylene impregnated compressible polyurethane foam precompressed to 50% of its
uncompressed length: "Polytite" by Polytite Manufacturing Corp. and distributed by W.R.
Grace Co.
2.04 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.
MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
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1. For primers used on site and within the weatherproofing/waterproof membrane
(interior) of the building comply with V.O.C. requirements specified in Section
G01600.
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.
1. For cleaners used on site and within the weatherproofing/waterproof membrane
(interior) of the building comply with V.O.C. requirements specified in Section
G01600.
C Masking Tape: Nonstaining, nonabsorbent material compatible with joint sealants and
surfaces adjacent to joints.
1. 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.
2. Cylindrical Sealant Backings: ASTM C 1330, Type C (closed-cell material with a
surface skin)], O (open-cell material)] or B (bicellular 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:
D. Bond Breaker Tape
Polyethylene or other plastic tape as recommended by the sealant manufacturer; non-
bonding to sealant; self-adhesive where applicable.
PART 3 - EXECUTION
3.01 EXAMINATION
A. Examine all joint surfaces for conditions that may be detrimental to the performance of
the completed Work. Do not proceed until satisfactory corrections have been made.
3.02 PREPARATION
A. Clean joint surfaces immediately before installation of sealant and other materials
specified in this Section.
1. Remove all loose materials, dirt, dust, rust, oils and other foreign matter that will
impair the performance of materials installed under this Section.
2. Remove protective coatings and similar materials from joint faces with
manufacturer's recommended solvents.
3. Use methods such as grinding, acid etching or other approved and
manufacturer's recommended means, if required, to clean the joint surfaces,
assuring that the sealant materials will obtain positive and permanent adhesion.
MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
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3.03 JOINT BACKING INSTALLATION
A. Install bond breaker tape in relaxed condition as it comes off the roll. Do not stretch the
tape. Lap individual lengths.
B. Install backer rod of sufficient size to fill the joint width at all points in a compressed state.
Compress backer rod at the widest part of the joint by a minimum of 25 percent. Do not
cut or puncture the surface skin of the rod.
3.04 SEALANT INSTALLATION
A. Except as shown or specified otherwise, install sealants in accordance with the
manufacturer's printed instructions.
B. Install sealants with ratchet hand gun or other approved mechanical gun. Where gun
application is impracticable, install sealant by knife or by pouring, as applicable.
C. Finishing
Tool all vertical, non-sag sealants so as to compress the sealant, eliminating all air voids
and providing a neat smoothly finished joint. Provide slightly concave joint surface, unless
otherwise indicated or recommended by the manufacturer.
1. Use tool wetting agents as recommended by the sealant manufacturer.
3.05 FIELD QUALITY CONTROL
A. Field Adhesion Testing of Sealants - Test completed elastomeric joints as follows:
1. Extent of Testing: Test completed elastomeric sealant joints as follows:
a. Perform 10 tests for the first 1000 feet of joint length for each type of
elastomeric sealant and join substrate.
b. Perform one test for each 1000 feet of joint length thereafter or one test
per each floor per elevation.
2. Test Method – Test joints by hand pull method described below:
a. Make knife cuts from one side of the joint to
the other, followed by two cuts approximately 2 inches long at sides of
joint and meeting cross cut at one end. Place a mark 1 inch from cross-
cut end of 2 inch piece.
b. Use fingers to grasp 2 inch piece of sealant between cross-cut end and
1” mark, pull firmly at a 90 degree angle or more in direction of side cuts
while holding a ruler along sides of sealant. Pull sealant out of joint to the
distance recommended by the sealant manufacturer for testing adhesive
capability, but not less than that equaling specified maximum movement
capability in extension, hold this position for 10 seconds.
MSBA Accelerated Repair Program RK Finn/Ryan Road and Leeds Elementary Schools Northampton, Massachusetts
Joint Sealants
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c. For joints with dissimilar substrates, check adhesion to each substrate
separately. Do this by extending cut along one side, checking adhesion
to opposite side.
3. Inspect joints for complete fill, for absence of voids, and for joint configuration
complying with specified requirements. Record results in a field-adhesion-test
log.
4. Inspect tested joints and report on the following:
a. Whether sealants in joints connected to pulled-out portion failed to
adhere to joint substrates or tore cohesively. Include data on pull
distance used to test each type of product and joint substrate. Compare
these results to determine if adhesion passes sealant manufacturer's
field-adhesion hand-pull test criteria.
b. Whether sealants filled joint cavities and are free of voids.
c. Whether sealant dimensions and configurations comply with specified
requirements.
5. Record test results in a field-adhesion-test log. Include dates when sealants were
installed, names of persons who installed sealants, test dates, test locations,
whether joints were primed, adhesion results and percent elongations, sealant
fill, sealant configuration, and sealant dimensions.
6. Repair sealants pulled from test area by applying new sealants following same
procedures used originally to seal joints. Ensure that original sealant surfaces are
clean and that new sealant contacts original sealant.
7. Evaluation of Field Test Results: Sealants not evidencing adhesive failure from
testing or noncompliance with other indicated requirements will be considered
satisfactory. Remove sealants that fail to adhere to joint substrates during testing
or to comply with other requirements. Retest failed applications until test results
prove sealants comply with indicated requirements.
3.06 CLEANING
A. Immediately remove misapplied sealant and droppings from metal surfaces with solvents
and wiping cloths. On other materials, remove misapplied sealant and droppings by
methods and materials recommended in writing by the manufacturer of the sealant
material.
B. After sealants are applied and before skin begins to form on sealant, remove all masking
and other protection and clean up remaining defacement caused by the Work.
END OF SECTION