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DocuSign Envelope ID:A9CF8A9E-4CDB-4BB9-A678-D4AD80CD1393 <br /> 5thWall Building Diagnostics Consultants Roof Replacement <br /> Central Recreation Center <br /> Hillsborough,NC <br /> August 2016 <br /> 3.06 Joint Design <br /> A. Joint depth shall never be greater than width. <br /> 1. If joint width is 1/4 inch to 1/2 inch wide,sealant depth at midpoint shall be 1/4 <br /> inch. <br /> 2. If joint width is 1/2 inch to 1 inch wide, sealant depth at midpoint shall be 3/8 <br /> inch to 1/2 inch. <br /> 3. If joint width is 1 inch to 2 inches wide, sealant depth at midpoint shall be 1/2 <br /> inch. <br /> B. In deep joints, the sealant depth shall be controlled by the use of back-up materials to <br /> maintain the recommended depth. <br /> C. Where depth of joint does not permit the use of back-up material then a bond breaker <br /> strip must be installed to prevent three-point bonding. <br /> 3.07 Installation of Sealants <br /> A. General: Prior to the start of installation in each joint, verify the joint type according to <br /> the details in the drawings and verify that the required proportion of width of joint to <br /> depth of joint has been secured. <br /> B. Equipment: Apply sealant under pressure with hand or power-actuated gun or other <br /> appropriate means. Guns shall have nozzle of proper size and shall provide sufficient <br /> pressure to completely fill joints as designed. <br /> C. Masking: Thoroughly and completely mask all joints where the appearance of sealant on <br /> adjacent surfaces would be objectionable. <br /> D. Installation of sealant: Install the sealant in strict accordance with the manufacturer's <br /> recommendations as approved by the Designer, thoroughly filling all joints to the <br /> recommended depth. <br /> E. Air voids shall not be present throughout the entire joint cross section. To ensure <br /> complete joint fill,tooling shall be performed within ten minutes of sealant application. <br /> F. Tool all joints to the profile shown on the details in the drawings. Tooling shall be done <br /> immediately after sealant application. <br /> G. Sealant shall be tooled with light pressure to spread the material against the back-up <br /> material and the joint surface. Tooling shall be performed with a concave profile tool to <br /> keep the sealant within the joint. <br /> H. Sealant shall be dry tooled unless specifically approved otherwise by the manufacturer <br /> and the Designer. If the sealant manufacturer approves,the tool may be dampened with a <br /> sealant manufacturer approved reducer. Water or soapy water shall not be used on the <br /> tool; do not over tool. <br /> 16-171 Sealants and Caulking <br /> 079200-4 <br />