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DocuSign Envelope ID:D561B1AE-DF34-4907-AD06-AOEB37BBE427 <br /> CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12,2020 <br /> 308 WEST FRANKLIN,CHAPEL HILL,NC <br /> 2.5 ACOUSTICAL JOINT SEALANTS <br /> A. Acoustical Joint Sealant: Manufacturer's standard nonsag, paintable, nonstaining latex sealant <br /> complying with ASTM C 834. Product effectively reduces airborne sound transmission through <br /> perimeter joints and openings in building construction as demonstrated by testing representative <br /> assemblies according to ASTM E 90. <br /> 1. Products: Subject to compliance with requirements, provide one of the following: <br /> a. Pecora Corporation,AIS 919 <br /> b. USG Corporation: Sheetrock Acoustic Sealant. <br /> B. ACOUSTIC SEALANT <br /> 1. Acoustic Sealant for application at top and bottom tracks of all demising and corridor <br /> walls. <br /> 2. Acoustic Sealant shall be non-skimming, non-hardening, permanently flexible sealant <br /> specifically designed for sealing gypsum wallboard systems. Sealant shall be capable of <br /> spanning11/2"wide gaps by 3/8"deep gaps. <br /> 3. Products: <br /> a. Presstite products No. 579.64 Acoustic Sealant. <br /> b. W.W.Henry"Sound Control Sealant"No 313B. <br /> 2.6 JOINT SEALANT BACKING <br /> A. General: Provide sealant backings of material that are nonstaining; are compatible with joint <br /> substrates, sealants, primers, and other joint fillers; and are approved for applications indicated <br /> by sealant manufacturer based on field experience and laboratory testing. <br /> B. Cylindrical Sealant Backings (Backer Rod): ASTM C 1330, Type C (closed-cell material with <br /> a surface skin), Type O (open-cell material), Type B (bicellular material with a surface skin) or <br /> any of the preceding types, as approved in writing by joint-sealant manufacturer for joint <br /> application indicated, and of size and density to control sealant depth and otherwise contribute <br /> to producing optimum sealant performance. <br /> C. Bond-Breaker Tape: Polyethylene tape or other plastic tape recommended by sealant <br /> manufacturer for preventing sealant from adhering to rigid, inflexible joint-filler materials or <br /> joint surfaces at back of joint. Provide self-adhesive tape where applicable. <br /> 2.7 MISCELLANEOUS MATERIALS <br /> A. Primer: Material recommended by joint-sealant manufacturer where required for adhesion of <br /> sealant to joint substrates indicated, as determined from preconstruction joint-sealant-substrate <br /> tests and field tests. <br /> B. Cleaners for Nonporous Surfaces: Chemical cleaners acceptable to manufacturers of sealants <br /> and sealant backing materials, free of oily residues or other substances capable of staining or <br /> harming joint substrates and adjacent nonporous surfaces in any way, and formulated to <br /> promote optimum adhesion of sealants to joint substrates. <br /> JOINT SEALANTS 079200 - 9 <br />