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DSS Skills Development Center Smith Sinnett / 2020045 <br />Chapel Hill, North Carolina Orange County <br /> <br />JOINT SEALANTS 07 92 00 - 5 <br />3.2 PREPARATION <br />A. Surface Cleaning of Joints: Clean out joints immediately before installing joint sealants to comply with <br />recommendations of joint sealer manufacturers and the following requirements: <br />1. Remove all foreign material from joint substrates which could interfere with adhesion of joint <br />sealer, including dust; paints, except for permanent, protective coatings tested and approved for <br />sealant adhesion and compatibility by sealant manufacturer; old joint sealants; oil; grease; <br />waterproofing; water repellants; water; surface dirt; and frost. <br />2. Clean concrete, masonry, unglazed surfaces of ceramic tile and similar porous joint substrate <br />surfaces, by brushing, grinding, blast cleaning, mechanical abrading, or a combination of these <br />methods to produce a clean, sound substrate capable of developing optimum bond with joint <br />sealants. Remove loose particles remaining from above cleaning operations by vacuuming or <br />blowing out joints with oil-free compressed air. <br />3. Remove laitance and form release agents from concrete. <br />4. Clean metal, glass, porcelain enamel, glazed surfaces of ceramic tile; and other nonporous surfaces <br />by chemical cleaners or other means which are not harmful to substrates or leave residues capable <br />of interfering with adhesion of joint sealants. <br />B. Joint Priming: Prime joint substrates where indicated or where recommended by joint sealer <br />manufacturer based on preconstruction joint sealer-substrate tests or prior experience. Apply primer to <br />comply with joint sealer manufacturer's recommendations. Confine primers to areas of joint sealer bond, <br />do not allow spillage or migration onto adjoining surfaces. <br />C. Masking Tape: Use masking tape where required to prevent contact of sealant with adjoining surfaces <br />which otherwise would be permanently stained or damaged by such contact or by cleaning methods <br />required to remove sealant smears. Remove tape immediately after tooling without disturbing joint seal. <br />3.3 INSTALLATION OF JOINT SEALANTS <br />A. General: Comply with joint sealant manufacturer's printed installation instructions applicable to <br />products and applications indicated, except where more stringent requirements apply. <br />B. Elastomeric Sealant Installation Standard: Comply with recommendations of ASTM C 962 for use of <br />joint sealants as applicable to materials, applications and conditions indicated. <br />C. Installation of Sealant Backings: Install sealant backings to comply with the following requirements: <br />1. Install joint fillers of type indicated to provide support of sealants during application and at <br />position required to produce the cross- sectional shapes and depths of installed sealants relative to <br />joint widths which allow optimum sealant movement capability. <br />a. Do not leave gaps between ends of joint fillers. Bond ends of gaskets together with <br />adhesive of "weld" by other means as recommended by manufacturer to ensure continuous <br />watertight and airtight performance. Miter-cut and bond ends at corners unless molded <br />corner units are provided. <br />b. Do not stretch, twist, puncture, or tear joint fillers. <br />c. Remove absorbent joint fillers which have become wet prior to sealant application and <br />replace with dry material. <br />2. Install bond breaker tape between sealants and joint fillers, compression seals, or back of joints <br />where adhesion of sealant to surfaces at back of joints would result in sealant failure. <br />3. Install compressible seals serving as sealant backings to comply with requirements indicated <br />above for joint fillers. <br />D. Installation of Sealants: Install sealants by techniques, that result in sealants directly contacting and <br />fully wetting joint substrates, completely filling recesses provided for each joint configuration, and <br />providing uniform cross-sectional shapes and depths relative to joint widths which allow optimum sealant <br />movement capability. <br />1. For sidewalks, pavements and similar joints sealed with elastomeric sealants and subject to traffic <br />and other abrasion and indentation exposures, fill joints to a depth equal to 75% of joint width, but <br />neither more than 5/8" deep nor less than 3/8" deep. <br />2. For normal moving joints sealed with elastomeric sealants but not subject to traffic, fill joints to a <br />depth equal to 50% of joint width, but neither more than ½" deep nor less than 1/4" deep. <br />DocuSign Envelope ID: ECCAC5A0-6CC8-4B37-8AD3-89D69F0AE1AE