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Gateway Park Center PERKINS+WILL <br /> 810495.000 <br /> 12/06/18 <br /> <br /> <br />JOINT SEALANTS <br />07 92 00 - 7 <br /> <br /> <br />3.2 PREPARATION <br />A. Surface Cleaning of Joints: Clean out joints immediately before installing joint <br />sealants to comply with joint-sealant manufacturer's written instructions and the <br />following requirements: <br />1. Remove all foreign material from joint substrates that could interfere with <br />adhesion of joint sealant, including dust, paints (except for permanent, <br />protective coatings tested and approved for sealant adhesion and <br />compatibility by sealant manufacturer), old joint sealants, oil, grease, <br />waterproofing, water repellents, water, surface dirt, and frost. <br />2. Clean porous joint substrate surfaces by brushing, grinding, blast cleaning, <br />mechanical abrading, or a combination of these methods to produce a clean, <br />sound substrate capable of developing optimum bond with joint sealants. <br />Remove loose particles remaining after cleaning operations above by <br />vacuuming or blowing out joints with oil-free compressed air. Porous joint <br />substrates include the following: <br />a. Concrete. <br />b. Masonry. <br />c. Unglazed surfaces of ceramic tile. <br />3. Remove laitance and form-release agents from concrete. <br />4. Clean nonporous surfaces with chemical cleaners or other means that do not <br />stain, harm substrates, or leave residues capable of interfering with adhesion <br />of joint 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 in writing by joint- <br />sealant manufacturer, based on preconstruction joint-sealant-substrate tests or <br />prior experience. Apply primer to comply with joint-sealant manufacturer's written <br />instructions. Confine primers to areas of joint-sealant bond; do not allow spillage <br />or migration onto adjoining surfaces. <br />C. Masking Tape: Use masking tape where required to prevent contact of sealant with <br />adjoining surfaces that otherwise would be permanently stained or damaged by <br />such contact or by cleaning methods required to remove sealant smears. Remove <br />tape immediately after tooling without disturbing joint seal. <br />3.3 INSTALLATION OF JOINT SEALANTS <br />A. General: Comply with joint-sealant manufacturer's written installation instructions <br />for products and applications indicated, unless more stringent requirements apply. <br />B. Sealant Installation Standard: Comply with recommendations in ASTM C 1193 for <br />use of joint sealants as applicable to materials, applications, and conditions <br />indicated.