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DocuSign Envelope ID:D561B1AE-DF34-4907-AD06-AOEB37BBE427 <br /> CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12,2020 <br /> 308 WEST FRANKLIN,CHAPEL HILL,NC <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 /> JOINT SEALANTS 079200 -2 <br />