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DocuSign Envelope ID:A9CF8A9E-4CDB-4BB9-A678-D4AD80CD1393 <br /> 5thWall Building Diagnostics Consultants Roof Replacement <br /> Central Recreation Center <br /> Hillsborough,NC <br /> August 2016 <br /> B. Thoroughly remove all materials from existing joint. Resulting joint shall be thoroughly <br /> cleaned, without residue, and properly prepared to receive new materials. Use <br /> mechanical means for cleaning if necessary being careful not to cause undue damage to <br /> surrounding surfaces. <br /> C. All surfaces in contact with sealant shall be dry, sound, and well brushed and wiped free <br /> from dust. <br /> D. Where back-up material is required, insert the approved backer-rod or bond-breaker tape in <br /> the joint cavity to the required depth. <br /> E. Prior to proceeding with the work, prepare and install one complete joint to be used as a <br /> standard for the remainder of the project. Joint shall be reviewed and accepted by the <br /> Designer prior to proceeding. <br /> 3.03 Installation of Back-Up Material <br /> A. Use only the back-up material recommended by the manufacturer of the sealant and <br /> approved by the owner for the particular installation, compressing the back-up material <br /> 25 to 50 percent to secure a positive and secure fit. When using back-up of tube or rod <br /> stock, avoid lengthwise stretching of the material. Do not twist or braid hose or rod back- <br /> up stock. <br /> B. Install backstops dry and free of tears or holes. Tightly pack the back or bottom of joint <br /> cavities with backstop material to provide a joint of the depth specified. <br /> 3.04 Primer <br /> A. Immediately prior to application of the sealant, clean out loose particles from joints. <br /> B. Where recommended by sealant manufacturer, apply primer to joints in accordance with <br /> sealant manufacturer's instructions. Do not apply primer to exposed finish surfaces. <br /> C. Apply primer in a thin,uniform film. Avoid build-up of film. <br /> D. Allow approximately 15 to 120 minutes drying time prior to applying sealant. Sealant <br /> must be applied same day as primer. <br /> E. Do not prime or puncture backer-rod. Do not apply primer to exposed finish surfaces. <br /> 3.05 Bond Breaker <br /> A. Provide bond breakers to the back or bottom of joint cavities, as recommended by the <br /> sealant manufacturer for each type of joint and sealant used, to prevent sealant from <br /> adhering to these surfaces. <br /> B. Carefully apply the bond breaker to avoid contamination of adjoining surfaces or <br /> breaking bond with surfaces other than those covered by the bond breaker. <br /> 16-171 Sealants and Caulking <br /> 079200-3 <br />