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3. Remove all oils, grease, wax, tar, asphalt, putty, caulking, mastic, laitance <br />protective films, waterproofing, form release agent, paint, dirt, and other <br />foreign matter. <br />4. Wipe surfaces with solvent wipe or cleaner as recommended by the <br />sealant manufacturers. <br />5. Mask adjacent to joints, as required, in continuous strips. <br />6. Apply primer as recommended by sealant manufacturer. Note: Primer is <br />not required with silicone or urethane on some surfaces. <br />7. Mortar replacement shall be complete and properly cured before placing <br />sealant. <br /> <br />C. Where spaces around openings are deeper than 3/8", they shall be packed with <br />backer rod to this depth prior to filling with sealant. Larger openings may require <br />other fill methods which should be submitted (prior to actual work) for approval. <br />D. Where joints are subject to movement install backer rod. <br /> <br />E. Sealant Color: <br />1. Color used shall match the materials being sealed and be approved by <br />Architect/Engineer/Engineer in charge. <br /> <br />F. Application: <br />1. Install backer rod in joints over 3/8" deep. <br />a. Install backer rod with blunt instrument compressing 25% to 50% <br />to fit joint, so joint depth is a minimum 1/4" or 50% of width. <br />b. With silicone sealants, provide joint depth of ½". <br />c. Do not stretch or twist backer rod while installing. <br />d. Measure depth to crest of backer rod. <br />2. Apply sealant by gun with a tip size that will seal the opening or joint with <br />one pass of the gun, giving a smooth finish free of wrinkles, voids or <br />pockets. <br />3. Install sealant to fill joint and bring flush with stone or brick face and dress <br />(tool) to a smooth, tight joint free of fins, smears or overlaps. <br />4. Tooling: <br />a. Perform tooling within ten (10) minutes of sealant application. <br />b. Compress sealant into joints with tooling rod. <br />c. Neatly tool finish all joints on flush surface flush. <br />d. Point internal corners with coving tool. <br />5. Remove masking materials immediately after tooling. <br /> <br />G. Clean Up: <br />1. Clean adjacent surfaces immediately of excess materials and smears as <br />work progresses. <br />2. Repair and correct all defective work. <br /> <br />3.6 ADJUST AND CLEAN: <br /> <br />A. Protect adjacent surfaces against damage during the Work of this Section. <br /> <br />MASONRY RESTORATION REPAIR <br />04920-5 <br /> <br />