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DocuSign Envelope ID: 313DA256 -1EDE- 4396- A716- 4C53B809027E <br />JERRY M. PASSMORE CENTER ADDITION AND RENOVATION <br />HILLSBOROUGH, NORTH CAROLINA <br />b. Bostik, Inc.; Chem -Calk 600. <br />C. May National Associates, Inc.; Bondaflex 600 or Bondaflex Sil -A 700. <br />d. Pecora Corporation; AC -20 +. <br />e. Schnee- Morehead, Inc.; SM 8200. <br />f. Tremco Incorporated; Tremflex 834. <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 />Products: Subject to compliance with requirements, provide one of the following: <br />a. Pecora Corporation; AC -20 FTR or AIS -919. <br />b. USG Corporation; SHEETROCK Acoustical Sealant. <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: ASTM C 1330, Type C (closed -cell material with a surface <br />skin), Type O (open -cell material), Type B (bicellular material with a surface skin), or any of <br />the preceding types, as approved in writing by joint - sealant manufacturer for joint application <br />indicated, and of size and density to control sealant depth and otherwise contribute to producing <br />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 />C. Masking Tape: Nonstaining, nonabsorbent material compatible with joint sealants and surfaces <br />adjacent to joints. <br />JOINT SEALANTS 079200-5 <br />