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5thWall Building Diagnostics Consultants Government Services Annex <br /> District Attorney Office <br /> Roof Replacement <br /> November 2009 <br /> Be Carefully apply the bond breaker to avoid contamination of adjoining surfaces or <br /> breaking bond with surfaces other than those covered by the bond breaker . <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 /> Be 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 /> Be 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 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 /> 09 -26 Sealants and Caulking <br /> 079200-4 <br />