ent their deterioration or damage due to moisture, high temperatures, contaminants, or other causes. 1.07 PROJECT CONDITIONS A. Inspection: Examine joint surfaces and backing, joint widths, and their anchorage to the structure, and conditions under which joint sealer work is to be performed, and notify Contractor in writing of conditions detrimental to proper completion of the work and performance of sealers. Do not proceed with joint sealer work until unsatisfactory conditions have been corrected in a manner acceptable to installer. Roof Replacement and Exterior Concrete Spall Repairs at Laiola, HA 2402 HPHA Job No. 19-013-402-S IFB-CMB-17-2025 Joint Sealants 07920-3 B. Weather Conditions: Do not proceed with installation of sealants under adverse weather conditions. Proceed with the work only when forecasted weather conditions are favorable for proper cure and development of high early bond strength. PART 2 - PRODUCTS 2.01 MANUFACTURER Provide one of the products of manufacturers listed hereinbelow or pre-approved equal. 2.02 MATERIALS A. Materials: Provide joint sealants, backing, and other related materials that are compatible with one another and with joint substrates under conditions of service and application, as approved by sealant manufacturer. Provide all joint sealants with low voe. B. Sealants: 1. Sealant No. 1 at Exterior Joints: One component polyurethane sealant, conforming to ASTM C920, Type S, Grade NS, Use NT, Class 25 or 35 as applicable. a. Masterseal NP-1; BASF. b. Dymonic; Tremco. c. Sikaflex - 1a; Sika. 2. Sealant No. 2 at All Horizontal Traffic-Bearing Joints: One component or multi-component polyurethane sealant, conforming to ASTM C920, Type S or M, Grade P, Use T, Class 25. a. Sikaflex - 1cSL or 2cSL; Sika Corp. b. Urexpan NR-200 or NR-201; Pecora Corp. c. SL 1 or SL 2; MasterSea!.
