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8/06/2020 <br />07 92 00 JOINT SEALANTS Page 3 of 5 <br /> <br />ASTM C 920, Type S or M, Grade NS, Class 25, Use NT. Sealant must be capable of handling <br />a minimum of +/- 50% joint movement and shall have a chemical cure. Color shall be approved <br />by Owner. Acceptable manufacturers/products shall be Dynatrol II, by Pecora Corporation; or <br />Sikaflex 2c, by Sika Corporation, or approved equivalent. Make sure materials are compatible <br />with substrates. <br />C. Cleaner: Shall be xylol, toluene, or commercial solvent recommended by the sealant <br />manufacturer. <br />D. Primer: Primers for substrates shall be as provided by the sealant manufacturer. Primers must <br />be provided and installed whether or not required by the manufacturer. If a sealant <br />manufacturer directly recommends against use of a primer, notify the Designer to discuss. <br />E. Backing Materials: Provide backing materials such as closed cell backer rod or bond break <br />tape, as required for complete and proper installation of sealants. <br />F. Protection Materials: Provide materials such as polyethylene sheeting, tape, and other <br />accessories as required to protect the existing roof systems, windows, trim and other building <br />features ]from damage or staining due to sealant installation. <br /> <br />PART 3 EXECUTION <br /> <br />3.1 SURFACE EXAMINATION AND PREPARATION <br /> <br />A. Examine area and condition under which work of this section will be performed. <br /> <br />B. Correct conditions detrimental to the proper and timely completion of the work. Do not proceed <br />until unsatisfactory conditions have been corrected. <br /> <br />C. Locate joints to be prepared and confirm widths and lengths to ensure proper materials are on <br />hand. <br /> <br />D. Do not add liquids, solvents, or powders to the sealant. Mix multi-component elastomeric <br />sealants in accordance with manufacturer’s instructions. <br /> <br />E. Thoroughly remove all existing materials (sealants, backer rod, mortar, etc.) from the existing joint. <br />Resulting joint shall be thoroughly cleaned to remove residue, and properly prepared to receive new <br />materials. Use light mechanical means for cleaning if necessary to remove existing sealants, being <br />careful not to cause damage to surrounding surfaces. <br /> <br />F. All surfaces to be in contact with sealant shall be dry, sound, and well brushed and wiped free from <br />dust. <br /> <br />3.2 INSTALLATION OF SEALANT <br /> <br />DocuSign Envelope ID: 7D9ACD4F-8F6C-42B6-9ADB-C60032DB6D03