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DocuSign Envelope ID:D561B1AE-DF34-4907-AD06-AOEB37BBE427 <br /> CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12,2020 <br /> 308 WEST FRANKLIN,CHAPEL HILL,NC <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 /> JOINT SEALANTS 079200 - 10 <br />