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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C
<br /> SECTION 07 92 00 —ELASTOMERIC JOINT SEALANTS
<br /> E. Shelf Life: Products over 9 months old shall not be used unless Manufacturer's published literature allow. Contractor
<br /> shall document product shelf-life information, and check expiration date before use.
<br /> F. Handling. Material shall be handled in such a manner to prevent exposure to moisture. During cold temperatures
<br /> (less than 40°F)store containers at room temperature for 24 hours.
<br /> 1.7 PROJECT CONDITIONS
<br /> A. Sealant shall not be applied during precipitation or started in the event there is a probability of precipitation during the
<br /> application. Conditions shall be forecast to be dry for no less than 24 hours after application.
<br /> B. Contractor shall ensure all of the sealant Manufacturer's published requirements are followed, including the following
<br /> general limitations for silicone sealants:
<br /> 1. Do not apply silicone sealants to polyurethane sealants.
<br /> 2. Do not allow silicone sealant to come in contact with alcohol-based sealants, butyl sealants, acrylic sealants or
<br /> any other incompatible materials.
<br /> 3. Do not allow silicone sealant to come in contact with oil-based caulking/sealants, oil, asphalt, polysulfides, or
<br /> fillers impregnated with oil, asphalt or tar.
<br /> 4. Do not install sealant on damp substrates.
<br /> 5. Do not install where sealant will be continually immersed in water.
<br /> 6. Contractor shall prime masonry, stainless steel, copper, galvanized steel and Kynar finished metal with sealant
<br /> Manufacturer's approved primer. Refer to specified primers.
<br /> 7. Contractor shall follow all of the Manufacturer's published precautions.
<br /> C. No more sealant shall be installed than can cure for 24 hours before precipitation.
<br /> PART 2 -PRODUCTS
<br /> 2.1 MATERIALS
<br /> A. Silicone sealant: Shall be a single-component, premium grade, silicone-based elastomeric material. It shall be
<br /> applicable in horizontal, vertical, and overhead joints. The sealant shall cure under the influence of atmospheric
<br /> moisture to form an elastomeric substance. Shall meet Federal Specification TT-S-00230C, Class A and ASTM C
<br /> 920,Type S, Grade NS, Class 50, Use NT, M, G,A or O. Color to match adjacent substrate materials and approved
<br /> by Owner in advance of application. Acceptable Manufacturers include Dow Corning 795 Silicone Building Sealant
<br /> or approved equivalent.
<br /> B. Polyurethane sealant:Shall be a single-component,premium grade,polyurethane-based elastomeric material. It shall
<br /> be applicable in horizontal, vertical, and overhead joints. The sealant shall cure under the influence of atmospheric
<br /> moisture to form an elastomeric substance. Shall meet Federal Specification TT-S-00227E, Type II, Class A and
<br /> ASTM C 920, Type M, Grade NS, Class 25, Use NT, M, G,A or O. Color to match adjacent substrate materials and
<br /> approved by Owner in advance of application. Acceptable Manufacturers include MasterSeal NP 1 by BASF
<br /> Corporation or approved equivalent.
<br /> C. Primer: Primer manufactured and recommended by Sealant Manufacturer. Contractor shall consult sealant
<br /> Manufacturer's published literature for specific substrate and primer types.
<br /> D. Backer-rod: Closed-cell backer-rod or soft backer-rod as recommended by sealant Manufacturer. Closed-cell backer
<br /> rod shall be 1/8" larger than joint for compression, and soft backer-rod shall be 25% greater than joint for tight fitting
<br /> compression in the joint.
<br /> E. Bond-breaker: Polyethylene strip or tape,as recommended by or supplied by the sealant Manufacturer to prevent 3-
<br /> sided bond in joints.
<br /> F. Preformed silicone seal:
<br /> 1. Type: Preformed, ultra-low modulus silicone extrusion for bonding to substrates with silicone sealant.Acceptable
<br /> Manufacturers include Dow Corning® 123 Silicone Seal, as manufactured by Dow Corning Corporation or
<br /> approved equivalent.
<br /> 2. Roll width: Two[2] inches.
<br /> 3. Color: As selected by Owner from manufacturer's standard colors.
<br /> 4. Material physical properties.
<br /> a. Hardness: 25-durometer hardness, Shore A,tested in accordance with ASTM C661.
<br /> b. Properties,tested in accordance with ASTM D412.
<br /> 1) Tensile strength: [400 psi] [2.75 MPa].
<br /> 2) Elongation:400 percent.
<br /> c. Tear strength, die B: [100 ppi] [17.5 kN/m],tested in accordance with ASTM C624.
<br /> d. Surface: Smooth matte.
<br /> G. Preformed silicone bonding sealant:
<br /> 1. Type: Compatible silicone type as recommended and provided by silicone seal manufacturer. Acetoxy-cure
<br /> silicone sealants are not acceptable.
<br /> ©BOOMERANG DESIGN 07 92 00-2 510 Meadowlands Drive,Hillsborough,NC
<br /> BD#1835 ORANGE COUNTY, NC 12/07/2018
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