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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br /> <br />JOINT SEALANTS 079200 - 12 <br />1. Apply masking tape to each side of joint, outside of area to be covered by sealant system. <br />2. Apply silicone sealant to each side of joint to produce a bead of size complying with <br />preformed silicone-sealant system manufacturer's written instructions and covering a <br />bonding area of not less than 3/8 inch (10 mm). Hold edge of sealant bead 1/4 inch (6 <br />mm) inside masking tape. <br />3. Within 10 minutes of sealant application, press silicone extrusion into sealant to wet <br />extrusion and substrate. Use a roller to apply consistent pressure and ensure uniform <br />contact between sealant and both extrusion and substrate. <br />4. Complete installation of sealant system in horizontal joints before installing in vertical <br />joints. Lap vertical joints over horizontal joints. At ends of joints, cut silicone extrusion <br />with a razor knife. <br />H. Installation of Preformed Foam Sealants: Install each length of sealant immediately after <br />removing protective wrapping. Do not pull or stretch material. Produce seal continuity at ends, <br />turns, and intersections of joints. For applications at low ambient temperatures, apply heat to <br />sealant in compliance with sealant manufacturer's written instructions. <br />I. Acoustical Sealant Installation: At sound-rated assemblies and elsewhere as indicated, seal <br />construction at perimeters, behind control joints, and at openings and penetrations with a <br />continuous bead of acoustical sealant. Install acoustical sealant at both faces of partitions at <br />perimeters and through penetrations. Comply with ASTM C 919 and with manufacturer's <br />written recommendations. <br />3.4 FIELD QUALITY CONTROL <br />A. Field-Adhesion Testing: Field test joint-sealant adhesion to joint substrates as follows: <br />1. Extent of Testing: Test completed and cured sealant joints as follows: <br />a. Perform 10 tests for the first 1000 feet (300 m) of joint length for each kind of <br />sealant and joint substrate. <br />b. Perform 1 test for each 1000 feet (300 m) of joint length thereafter or 1 test per <br />each floor per elevation. <br />2. Test Method: Test joint sealants according to Method A, Field-Applied Sealant Joint <br />Hand Pull Tab, in Appendix X1 in ASTM C 1193 or Method A, Tail Procedure, in <br />ASTM C 1521. <br />a. For joints with dissimilar substrates, verify adhesion to each substrate separately; <br />extend cut along one side, verifying adhesion to opposite side. Repeat procedure <br />for opposite side. <br />3. Inspect tested joints and report on the following: <br />a. Whether sealants filled joint cavities and are free of voids. <br />b. Whether sealant dimensions and configurations comply with specified <br />requirements. <br />c. Whether sealants in joints connected to pulled-out portion failed to adhere to joint <br />substrates or tore cohesively. Include data on pull distance used to test each kind <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2