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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 - 10 <br />C. Masking Tape: Nonstaining, nonabsorbent material compatible with joint sealants and surfaces <br />adjacent to joints. <br />PART 3 - EXECUTION <br />3.1 EXAMINATION <br />A. Examine joints indicated to receive joint sealants, with Installer present, for compliance with <br />requirements for joint configuration, installation tolerances, and other conditions affecting joint- <br />sealant performance. <br />B. Proceed with installation only after unsatisfactory conditions have been corrected. <br />3.2 PREPARATION <br />A. Surface Cleaning of Joints: Clean out joints immediately before installing joint sealants to <br />comply with joint-sealant manufacturer's written instructions and the following requirements: <br />1. Remove all foreign material from joint substrates that could interfere with adhesion of <br />joint sealant, including dust, paints (except for permanent, protective coatings tested and <br />approved for sealant adhesion and compatibility by sealant manufacturer), old joint <br />sealants, oil, grease, waterproofing, water repellents, water, surface dirt, and frost. <br />2. Clean porous joint substrate surfaces by brushing, grinding, mechanical abrading, or a <br />combination of these methods to produce a clean, sound substrate capable of developing <br />optimum bond with joint sealants. Remove loose particles remaining after cleaning <br />operations above by vacuuming or blowing out joints with oil-free compressed air. <br />Porous joint substrates include the following: <br />a. Concrete. <br />b. Masonry. <br />c. Unglazed surfaces of ceramic tile. <br />d. Exterior insulation and finish systems. <br />e. Stone veneer <br />3. Remove laitance and form-release agents from concrete. <br />4. Clean nonporous joint substrate surfaces with chemical cleaners or other means that do <br />not stain, harm substrates, or leave residues capable of interfering with adhesion of joint <br />sealants. Nonporous joint substrates include the following: <br />a. Metal. <br />b. Glass. <br />c. Porcelain enamel. <br />d. Glazed surfaces of ceramic tile. <br />B. Joint Priming: Prime joint substrates where recommended by joint-sealant manufacturer or as <br />indicated by preconstruction joint-sealant-substrate tests or prior experience. Apply primer to <br />comply with joint-sealant manufacturer's written instructions. Confine primers to areas of joint- <br />sealant bond; do not allow spillage or migration onto adjoining surfaces. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2