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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 - 2 <br />1. Use ASTM C 1087 to determine whether priming and other specific joint preparation <br />techniques are required to obtain rapid, optimum adhesion of joint sealants to joint <br />substrates. <br />2. Submit not fewer than eight pieces of each kind of material, including joint substrates, <br />shims, joint-sealant backings, secondary seals, and miscellaneous materials. <br />3. Schedule sufficient time for testing and analyzing results to prevent delaying the Work. <br />4. For materials failing tests, obtain joint-sealant manufacturer's written instructions for <br />corrective measures including use of specially formulated primers. <br />5. Testing will not be required if joint-sealant manufacturers submit joint preparation data <br />that are based on previous testing, not older than 24 months, of sealant products for <br />adhesion to, and compatibility with, joint substrates and other materials matching those <br />submitted. <br />B. Preconstruction Field-Adhesion Testing: Before installing sealants, field test their adhesion to <br />Project joint substrates as follows: <br />1. Locate test joints where indicated on Project or, if not indicated, as directed by Architect. <br />2. Conduct field tests for each application indicated below: <br />a. Each kind of sealant and joint substrate indicated. <br />3. Notify Architect seven days in advance of dates and times when test joints will be <br />erected. <br />4. Arrange for tests to take place with joint-sealant manufacturer's technical representative <br />present. <br />a. Test Method: Test joint sealants according to Method A, Field-Applied Sealant <br />Joint Hand Pull Tab, in Appendix X1 in ASTM C 1193 or Method A, Tail <br />Procedure, in ASTM C 1521. <br />1) For joints with dissimilar substrates, verify adhesion to each substrate <br />separately; extend cut along one side, verifying adhesion to opposite side. <br />Repeat procedure for opposite side. <br />5. Report whether sealant failed to adhere to joint substrates or tore cohesively. Include <br />data on pull distance used to test each kind of product and joint substrate. For sealants <br />that fail adhesively, retest until satisfactory adhesion is obtained. <br />6. Evaluation of Preconstruction Field-Adhesion-Test Results: Sealants not evidencing <br />adhesive failure from testing, in absence of other indications of noncompliance with <br />requirements, will be considered satisfactory. Do not use sealants that fail to adhere to <br />joint substrates during testing. <br />1.4 SUBMITTALS <br />A. Product Data: For each joint-sealant product indicated. <br />B. Samples for Initial Selection: Manufacturer's color charts consisting of strips of cured sealants <br />showing the full range of colors available for each product exposed to view. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2