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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 - 11 <br />C. Masking Tape: Use masking tape where required to prevent contact of sealant or primer wit h <br />adjoining surfaces that otherwise would be permanently stained or damaged by such contact or <br />by cleaning methods required to remove sealant smears. Remove tape immediately after tooling <br />without disturbing joint seal. <br />3.3 INSTALLATION OF JOINT SEALANTS <br />A. General: Comply with joint-sealant manufacturer's written installation instructions for products <br />and applications indicated, unless more stringent requirements apply. <br />B. Sealant Installation Standard: Comply with recommendations in ASTM C 1193 for use of joint <br />sealants as applicable to materials, applications, and conditions indicated. <br />C. Install sealant backings of kind indicated to support sealants during application and at position <br />required to produce cross-sectional shapes and depths of installed sealants relative to joint <br />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 application and <br />replace them with dry materials. <br />D. Install bond-breaker tape behind sealants where sealant backings are not used between sealants <br />and backs of joints and where shown on the drawings. <br />E. Install sealants using proven techniques that comply with the following and at the same time <br />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 that allow <br />optimum sealant movement capability. <br />F. Tooling of Nonsag Sealants: Immediately after sealant application and before skinning or <br />curing begins, tool sealants according to requirements specified in subparagraphs below to form <br />smooth, uniform beads of configuration indicated; to eliminate air pockets; and to ensure <br />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 that do not <br />discolor sealants or adjacent surfaces. <br />3. Provide concave joint profile per Figure 8A in ASTM C 1193, unless otherwise <br />indicated. <br />4. Provide flush joint profile where indicated per Figure 8B in ASTM C 1193. <br />5. Provide recessed joint configuration of recess depth and at locations indicated per <br />Figure 8C in ASTM C 1193. <br />a. Use masking tape to protect surfaces adjacent to recessed tooled joints. <br />G. Installation of Preformed Silicone-Sealant System: Comply with the following requirements: <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2