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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 07 90 00 -JOINT PROTECTION <br /> C. Bond-Breaker Tape:Polyethylene tape or other plastic tape recommended by sealant manufacturer for preventing sealant <br /> from adhering to rigid, inflexible joint-filler materials or joint surfaces at back of joint where such adhesion would result in <br /> sealant failure. Provide self-adhesive tape where applicable. <br /> 2.7 MISCELLANEOUS MATERIALS <br /> A. Primer: Material recommended by joint sealant manufacturer where required for adhesion of sealant to joint substrates <br /> indicated,as determined from preconstruction joint-sealant-substrate tests and field tests. <br /> B. Cleaners for Nonporous Surfaces: Chemical cleaners acceptable to manufacturers of sealants and sealant backing <br /> materials,free of oily residues or other substances capable of staining or harming joint substrates and adjacent nonporous <br /> surfaces in any way,and formulated to promote optimum adhesion of sealants with joint substrates. <br /> C. Masking Tape: Nonstaining, nonabsorbent material compatible with joint sealants and surfaces 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 requirements for joint <br /> configuration,installation tolerances,and other conditions affecting joint-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 comply with joint sealant <br /> manufacturer's written instructions and the following requirements: <br /> 1. Remove all foreign material from joint substrates that could interfere with adhesion of joint sealant, including <br /> dust, paints (except for permanent, protective coatings tested and approved for sealant adhesion and <br /> compatibility by sealant manufacturer), old joint sealants, oil, grease, waterproofing, water repellents, water, <br /> surface dirt, and frost. <br /> 2. Clean porous joint substrate surfaces by brushing, grinding, blast cleaning, mechanical abrading, or a <br /> combination of these methods to produce a clean, sound substrate capable of developing optimum bond with <br /> joint sealants. Remove loose particles remaining from above cleaning operations by vacuuming or blowing out <br /> joints with oil-free compressed air. Porous joint surfaces include the following: <br /> a. Masonry. <br /> 3. Clean nonporous surfaces with chemical cleaners or other means that do not stain, harm substrates, or leave <br /> residues capable of interfering with adhesion of joint sealants. <br /> a. Metal. <br /> b. Glass. <br /> B. Joint Priming: Prime joint substrates where recommended in writing by joint sealant manufacturer, based on <br /> preconstruction joint-sealant-substrate tests or prior experience.Apply primer to comply with joint sealant manufacturer's <br /> written instructions. Confine primers to areas of joint-sealant bond; do not allow spillage or migration onto adjoining <br /> surfaces. <br /> C. Masking Tape:Use masking tape where required to prevent contact of sealant with adjoining surfaces that otherwise would <br /> be permanently stained or damaged by 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 for products and applications indicated, <br /> unless more stringent requirements apply. <br /> B. Sealant Installation Standard: Comply with recommendations of ASTM C 1193 for use of joint sealants as applicable to <br /> materials,applications,and conditions indicated. <br /> C. Install sealant backings of type indicated to support sealants during application and at position required to produce cross- <br /> sectional shapes and depths of installed sealants relative to joint widths that allow optimum sealant movement capability. <br /> 1. Do not leave gaps between ends of sealant backings. <br /> 2. Do not stretch,twist, puncture, or tear sealant backings. <br /> 3. Remove absorbent sealant backings that have become wet before sealant application and replace them with <br /> dry materials. <br /> D. Install bond-breaker tape behind sealants where sealant backings are not used between sealants and back of joints. <br /> E. Install sealants by proven techniques to comply with the following and at the same time backings are installed: <br /> ©BOOMERANG DESIGN 07 90 00-3 510 Meadowlands Drive,Hillsborough,NC <br /> BD#1835 ORANGE COUNTY,NC 12/07/2018 <br />