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<br />0079200.4 – JOINT SEALANTS <br /> <br />Project Manual for Motor Pool Main Building Roof Replacement <br />Orange County, Hillsborough, NC <br />Prepared by Atlas Engineering, Inc., 551-A Pylon Drive – Raleigh, NC 27606 <br />August 2021 <br />3.02 INSTALLATION OF SEALANT <br /> <br />A. Masking: Thoroughly and completely mask all joints where the appearance of primer or sealant <br />on adjacent surfaces would be objectionable. Do not apply primer to exposed finish surfaces. <br /> <br />B. Apply primer to joints in accordance with sealant manufacturer’s instructions. Do not apply <br />primer to exposed finish surfaces. Primer application will be required whether or not required by <br />the manufacturer. Primer use will only be waived if specifically recommended against, in writing <br />for this specific project condition, by the manufacturer. Apply primer in a thin, uniform film. <br />Avoid build-up of film. <br /> <br />C. Allow primer drying time prior to applying sealant. Sealant must be applied same day as primer. <br /> <br />D. Backing Materials: Install backing materials into the joints to provide proper joint depth to width <br />ratio and to prevent three-sided adhesion. Select backer rod diameter to allow for proper fit <br />without shifting or tearing/deforming of the material. Do not puncture, twist, or braid the backer <br />rod material during installation. If proper joint depth is not available with backer rod use, utilize <br />bond breaker tape. <br /> <br />E. Apply sealant under pressure with hand or power-actuated gun or other appropriate means. Guns <br />shall have nozzle of proper size and shall provide sufficient pressure to completely fill joints as <br />designed. <br /> <br />F. Install the sealant in strict accordance with the manufacturer's recommendations as approved by the <br />Designer, thoroughly filling all joints to the recommended depth. <br /> <br />G. No air voids/bubbles shall be present within the cross-section of the joint. To ensure complete joint <br />fill, tooling shall be performed within ten to fifteen minutes of sealant application (prior to skinning). <br />Sealant shall be tooled with light pressure to spread the material against the sides of the joint and <br />provide a profile to match existing. Do not smear sealant onto surrounding surface of the <br />window/louver frames. <br /> <br />H. Sealant shall be dry tooled unless specifically approved otherwise by the manufacturer and the <br />Designer. If the sealant manufacturer approves, the tool may be dampened with a sealant <br />manufacturer approved reducer. Water or soapy water shall not be used on the tool. <br /> <br />3.03 FIELD QUALITY CONTROL <br /> <br />A. The installer shall perform adhesion and cohesion testing on sample sealant joint locations once <br />cured to ensure that cleaning, priming, and sealant installation was performed adequately. If the <br />Designer is not present at the testing, provide a written confirmation of acceptance by the <br />Manufacturer for their warranty. <br /> <br />DocuSign Envelope ID: 9514E4EC-C3C9-4752-8A7F-22E83B22BB8E