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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br /> <br />JOINT SEALANTS 079200 - 9 <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 /> <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 />spanning ½” 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 />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2