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2.6 JOINT SEALANr BACI�NNG <br /> A. General: Provide sealant backings of material and type that are nonstaining;aze compatible <br /> with joint substrates,sealants, primers and other joint fillers; and are approved for applications indicated by <br /> sealant manufacturer based on field experience and laboratory testing. <br /> B. Plastic Foam Joint Fillers: Preformed,compressible,resilient,nonstaining,nonwa�cing, <br /> nonextruding strips of flexible plastic foam ofmaterial indicated below and of size,shape,and density to control <br /> sealant depth and otherwise contribute to producing optimum sealant performance: <br /> 1. Open-cell polyurethane foam. <br /> 2. Closed-cell polyethylene foam, nonabsorbent to liquid water and gas, nonoutgassing in <br /> unruptured state. <br /> 2.7 MISCELLANEOUS MATERIALS <br /> A. Primer: Material recommended by joint sealant manufacturer <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 sealant <br /> performance. Do not proceed with installation of joint sealants until unsatisfactory conditions have been <br /> corrected. <br /> 3.2 PREPARATION <br /> A. Surface Cleaning of Joints: Clean out joints immediately before installing joint sea.lants to <br /> comply with recommendations of joint sealant manufacbu�er and the following requirements: <br /> 1. Remove all foreign material from joint substrates that could interfere with adhesion of joint <br /> sealant,including dust,paints(except for permanent,protective coatings tested and approved <br /> for sealant adhesion and compatibility by sealant manufachuer),old joint sealants,oil,grease, <br /> waterproofing,water repellents,water,surface dirt,and frost. <br /> 2. Remove laitance and form release agents from concrete. <br /> 3. Clean metal, glass, porcelain enamel, glazed surfaces of ceramic tile, and other nonporous <br /> 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 /> B. Joint Priming: Prime joint substrates where indicated or where recommended by joint <br /> sealant manufacturer based on preconstruction joint sealant-substrate tests or prior experience. Apply primer <br /> to comply with joint sealant manufacturer's recommendations. Confine primers to areas of joint sealant bond; <br /> do not allow spillage or migration onto adjoining surfaces. <br /> 3.3 INSTALLATION OF JOINT SEALANTS <br /> A. General: Comply with joint sealant manufacture�'s printed installation instructions <br /> applicable to products and applications indicated,except where more stringent requirements apply. <br /> B. Sealant Installation Standard: Comply with recommendations of ASTMaC 1193 for use of <br /> Page 4 of 5 <br />