Orange County NC Website
Browse       Search
DocuSign Envelope ID: B49FB256 -4ADF- 4759- AF63- 134AD44FC239 <br />5thWall Building Diagnostics Consultants Slate Roof Replacement <br />Orange County Skills Development Center <br />Chapel Hill, NC <br />August 2017 <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 />17 -198 Sealants and Caulking <br />079200-4 <br />