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DSS Skills Development Center Smith Sinnett / 2020045 <br />Chapel Hill, North Carolina Orange County <br /> <br />ACOUSTICAL TILE CEILINGS 09 51 23 - 5 <br />a. Pecora Corporation; AC-20 FTR Acoustical and Insulation Sealant. <br />b. USG Corporation; SHEETROCK Acoustical Sealant. <br />2. Acoustical Sealant for Concealed Joints: <br />a. OSI Sealants, Inc.; Pro-Series SC-175 Rubber Base Sound Sealant. <br />b. Pecora Corporation; BA-98. <br />c. Tremco, Inc.; Tremco Acoustical Sealant. <br />C. Acoustical Sealant for Exposed and Concealed Joints: Manufacturer's standard non-sag, paintable, non- <br />staining latex sealant, with a VOC content of 250 g/L or less when calculated according to 40 CFR 59, <br />Subpart D (EPA Method 24), complying with ASTM C 834 and effective in reducing airborne sound <br />transmission through perimeter joints and openings in building construction as demonstrated by testing <br />representative assemblies according to ASTM E 90. <br />D. Acoustical Sealant for Concealed Joints: Manufacturer's standard nondrying, nonhardening, non- <br />skinning, non-staining, gunnable, synthetic-rubber sealant, with a VOC content of 250 g/L or less when <br />calculated according to 40 CFR 59, Subpart D (EPA Method 24), recommended for sealing interior <br />concealed joints to reduce airborne sound transmission. <br />2.7 MISCELLANEOUS MATERIALS <br />A. Hold-Down Clips for Non-Fire-Rated Ceilings: For interior ceilings composed of lay-in panels weighting <br />less than 1 lb per sq.ft., provide hold-down clips spaced 2'-0" o.c. on all cross tees. <br />PART 3 - EXECUTION <br />3.1 EXAMINATION <br />A. Examine substrates, areas, and conditions, including structural framing and substrates to which acoustical <br />tile ceilings attach or abut, with Installer present, for compliance with requirements specified in this and <br />other Sections that affect ceiling installation and anchorage and with requirements for installation <br />tolerances and other conditions affecting performance of acoustical tile ceilings. <br />1. Proceed with installation only after unsatisfactory conditions have been corrected. <br />3.2 PREPARATION <br />A. Testing Substrates: Before installing adhesively applied tiles on wet-placed substrates such as cast-in- <br />place concrete or plaster, test and verify that moisture level is below tile manufacturer's recommended <br />limits. <br />B. Measure each ceiling area and establish layout of acoustical tiles to balance border widths at opposite <br />edges of each ceiling. Avoid using less-than-half-width tiles at borders and comply with layout shown on <br />reflected ceiling plans. <br />3.3 INSTALLATION, SUSPENDED ACOUSTICAL TILE CEILINGS <br />A. General: Install acoustical tile ceilings to comply with ASTM C 636 and seismic design requirements <br />indicated, per manufacturer's written instructions and CISCA's "Ceiling Systems Handbook." <br />B. Suspend ceiling hangers from building's structural members and as follows: <br />1. Install hangers plumb and free from contact with insulation or other objects within ceiling plenum <br />that are not part of supporting structure or of ceiling suspension system. <br />2. Splay hangers only where required to miss obstructions; offset resulting horizontal forces by <br />bracing, countersplaying, or other equally effective means. <br />DocuSign Envelope ID: ECCAC5A0-6CC8-4B37-8AD3-89D69F0AE1AE