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� <br /> A. Tape Sealant: Manufacturer's standard, solvent-free, butyl-based tape seaiant with a , <br /> solids content of 100 percent formulated to be nonstaining, paintable, and nonmigra#�ng <br /> in contact with nonporous surfaces with or without reinforcement thread to prevent , <br /> stretch and packaged on rolls with a release paper on one side. <br /> 2.5 PREFORMED FOAM SEALANTS � <br /> A. Preformed Foam Sealants: Mauufacturer's standard preformed, precompressed, <br /> impregnated open-ceII foam seala.nt manufactured from high-density urethane foam � <br /> impregnated with a nondrying, water repellent agent; factory-produced in precomptessed <br /> sizes and in roll or stick form to fit joint widths indicated and to deveiop a watertight and <br /> airtight seal when compressed to the degree specified by manufacturer; and campiying � <br /> with the following requirements: <br /> 1. eias�ic, mildew-resistant, nonmigratory, nonstaining, and compatible with joint substrates <br /> and other joint sealants. , <br /> 2.6 JOINT SEALANT BACKING <br /> A. General: Provide sealant backings of maferial and type that are nonstaining, are ' <br /> compatible with joint substrates, sealants, primers and other joint fillers; and are <br /> approved for applications indicated by sealant manufacturer based on field experience , <br /> and laboratory testing. <br /> B. Plastic Foam Joint Fillers: Prefortned, compressible, resilient, nonstaining, nonwaxing, <br /> nonextruding strips of flexible plastic foam of material ittdicated below and of size, , <br /> shape, and density to control sealant depth and otherwise contribute to producing <br /> optimum sealant perfarmance: <br /> I. Open-celi polyurethane foam. ' <br /> 2. Closed-cell polyethylene foam, nonabsorbent to liQuid water and gas, <br /> nonoutgassing 'vn uncuptured state. <br /> 2.7 MISCELLANEOUS MATERI�.LS � <br /> A. Primer: Material recommended by joint sealant manufacturer . , <br /> PART3 -EXECUTION <br /> 3.1 EXAMIlVATION � <br /> A. Examine joiuts indicated to receive joint sealants, with Installcr present, for compliance � <br /> with requirements for joint configuration, installation tolerances, and other wnditions <br /> afFecting joint sealant performance. Do not proceed with instailation of joint seaIants <br /> until unsatisfactory conditions have beea corrected. � <br /> 3.2 PREPARATION <br /> A. Surface Cleaning of Joints: Clean out joints immediately before installing joint sealants , <br /> to comply with recommendations of joint sealant manufacturer and the following <br /> requirements: <br /> r <br /> THERMAL& MUISTURE PROTECTION Page 4 of6 <br /> � <br />