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DocuSign Envelope ID: B49FB256 -4ADF- 4759- AF63- 134AD44FC239 <br />5thWall Building Diagnostics Consultants Slate Roof Replacement <br />Orange County Skills Development Center <br />Chapel Hill, NC <br />August 2017 <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 />17 -198 Sealants and Caulking <br />079200 -3 <br />