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position required to produce cross-sectional shapes and depths of installed sealants relative to <br />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 bnkings that have become wet before sealant <br />application and replace them with dry materials. <br />I;. 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 that <br />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 to <br />form smooth, uniform beads of configuration indicated; to eliminate air pockets; and to <br />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 that <br />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 />4. Provide flush joint configuration where indicated per Figure 5B in ASTM C 1193. <br />5. Provide recessed joint configuration of recess depth and at locations indicated per <br />Figure 5C in ASTM C 1193. <br />a. Use masking tape to protect surfaces adjacent to recessed tooled joints. <br />H. Install sealants to size and shape shown on drawings, or, if not shown, with slightly <br />concave surfaces. <br />a. The minimum opening should be 1/4". <br />b. The opening should be at least 4 times the maximum movement of the <br />sealant. <br />C. The sealant should be more than 1/4" and less than 1/2" deep. <br />d. The depth of the sealant should be no greater than the width. <br />e. No joint to receive sealant should be less than 1/4" deep. <br />3.4 FIELD QUALITY CONTROL <br />07900-9 <br />