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Gateway Park Center PERKINS+WILL <br /> 810495.000 <br /> 12/06/18 <br /> <br /> <br />JOINT SEALANTS <br />07 92 00 - 8 <br /> <br /> <br />C. Acoustical Sealant Application Standard: Comply with recommendations in <br />ASTM C 919 for use of joint sealants in acoustical applications as applicable to <br />materials, applications, and conditions indicated. <br />D. Install sealant backings of type indicated to support sealants during application and <br />at position required to produce cross-sectional shapes and depths of installed <br />sealants relative to joint widths that allow optimum sealant movement capability. <br />1. Do not leave gaps between ends of sealant backings. <br />2. Do not stretch, twist, puncture, or tear sealant backings. <br />3. Remove absorbent sealant backings that have become wet before sealant <br />application and replace them with dry materials. <br />E. Install bond-breaker tape behind sealants where sealant backings are not used <br />between sealants and backs of joints. <br />F. Install sealants using proven techniques that comply with the following and at the <br />same time backings are installed: <br />1. Place sealants so they directly contact and fully wet joint substrates. <br />2. Completely fill recesses in each joint configuration. <br />3. Produce uniform, cross-sectional shapes and depths relative to joint widths <br />that allow optimum sealant movement capability. <br />G. Tooling of Nonsag Sealants: Immediately after sealant application and before <br />skinning or curing begins, tool sealants according to requirements specified below <br />to form smooth, uniform beads of configuration indicated; to eliminate air pockets; <br />and to ensure contact and adhesion of sealant with sides of joint. <br />1. Remove excess sealant from surfaces adjacent to joints. <br />2. Use tooling agents that are approved in writing by sealant manufacturer and <br />that do not discolor sealants or adjacent surfaces. <br />3. Provide concave joint configuration per Figure 5A in ASTM C 1193, unless <br />otherwise indicated. <br />a. Use masking tape to protect surfaces adjacent to recessed tooled joints. <br />3.4 CLEANING <br />A. Clean off excess sealant or sealant smears adjacent to joints as the Work <br />progresses by methods and with cleaning materials approved in writing by <br />manufacturers of joint sealants and of products in which joints occur. <br />3.5 PROTECTION <br />A. Protect joint sealants during and after curing period from contact with <br />contaminating substances and from damage resulting from construction operations <br />or other causes so sealants are without deterioration or damage at time of <br />Substantial Completion. If, despite such protection, damage or deterioration <br />occurs, cut out and remove damaged or deteriorated joint sealants immediately so <br />installations with repaired areas are indistinguishable from original work.