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BID TITLE: BID 19 -17 -12 -HR BID NUMBER: ROOFING MAINTENANCE & REPAIRS <br />SECTION 07920 — SEALANTS AND CAULKINGS <br />(Continued) <br />3.01 INSPECTION <br />A. Inspect substrate surface to ensure that no bond -breaker materials contaminate <br />the surface to which the sealant is to adhere and to ensure that unsound <br />substrates are repaired. Installation of sealant shall be evidence of acceptance of <br />the substrate. <br />B. Verify joint dimensions prior to installation of sealant to ensure that all dimensions <br />are within tolerance established in the manufacturer's literature. Unacceptable <br />variations shall be called to the attention of the CITY REPRESENTATIVE for <br />resolution. <br />3.02 PREPARATION <br />A. Clean, prepare, and size joints in conformance with manufacturer's instructions. <br />Remove any loose materials and other foreign matter which might impair <br />adhesion of sealant. <br />B. Verify that joint shaping materials and release tapes are compatible with sealant. <br />C. Examine joint dimensions and size materials to achieve required width/depth ratios. <br />D. Use joint filler to achieve required joint depths, to allow sealants to perform <br />properly. <br />E. Use bond breaker at joints subject to movement where sealant contacts back of <br />joint. <br />F. Prime as required, protecting all adjacent exposed surfaces. <br />3.03 INSTALLATION <br />A. Install backer rod using a blunt or round tool which will insure a uniform (1/8") <br />depth without puncturing the material. <br />B. Apply sealant in continuous beads, without open joints, voids or air pockets so as <br />to provide a watertight and airtight seal for the entire joint length. Take all <br />necessary steps to prevent three sided adhesions. Sealant depth shall be one <br />half of joint width, with a minimum depth of 1/4", and a maximum of 2", unless <br />otherwise required by manufacturer. <br />C. TOOLING: <br />Tool exposed surfaces of sealant to the profile shown or, if none is shown, tool <br />slightly concave. <br />Revised 6/27/18 Page 28 <br />