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Orange County Facility Renovations <br />Hillsborough, NC <br />Smith Sinnett JOINT SEALANTS <br />2020046/2020047/2020048/2020049/2020055 07 92 00 - 5 <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 <br />surfaces by chemical cleaners or other means which are not harmful to substrates or leave <br />residues capable 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 <br />bond, 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 <br />seal. <br /> <br /> <br />3.3 INSTALLATION OF JOINT SEALANTS <br /> <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 <br />to 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 <br />continuous watertight and airtight performance. Miter-cut and bond ends at corners <br />unless molded 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 <br />sealant movement capability. <br />1. For sidewalks, pavements and similar joints sealed with elastomeric sealants and subject to <br />traffic and other abrasion and indentation exposures, fill joints to a depth equal to 75% of joint <br />width, but 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 <br />a depth equal to 50% of joint width, but neither more than ½" deep nor less than 1/4" deep. <br />3. Install fire-rated sealants or sealants used in fire-rated joints or assemblies in a accordance with <br />manufacturer's recommendations and as acceptable to Code authorities to achieve the required <br />rating. <br />E. Tooling of Non-sag Sealants: Immediately after sealant application and prior to time skinning or <br />curing begins, tool sealants to form smooth, uniform beads of configuration indicated, to eliminate air <br />pockets, and to ensure contact and adhesion of sealant with sides of joint. Remove excess sealants <br />from surfaces adjacent to joint. Do not use tooling agents which discolor sealants or adjacent surfaces <br />or are not approved by sealant manufacturer. <br />1. Provide concave joint configurations per Figure 6A in ASTM C 962, unless otherwise indicated. <br /> <br />DocuSign Envelope ID: 09980A3B-0691-41B4-854D-3865F2287392