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INDIAN RIVER COUNTY — COURTHOUSE <br />LOW SLOPE - ROOFING REPLACEMENT PROJECT <br />jANU RY 26 2021 (REVISED APRIL 23, 2021) <br />B. Base Sheet <br />PAGE 9 <br />SECTION 075520 <br />MODIFIED BITUMINOUS MEMBRANE ROOFING <br />a. Self -Adhesive Modified Bitumen Base Ply <br />Probase SA Base Ply <br />C. Rigid Roof Insulation: Roof insulation shall be UL and FM approved. Insulation shall <br />be approved in writing by the insulation manufacturer for intended use and for use with <br />the specified roof assembly. Maintain a maximum panel size of 4 feet by 4 feet where <br />polyisocyan u rate insulation is specified to be installed in insulation adhesive. <br />a. Polyisocyan u rate Roof Insulation: Flat panels and tapered panels (where <br />required) composed of a closed cell, rigid polyisocya n u rate foam core material, <br />integrally laminated between glass fiber facers, in full compliance with ASTM C <br />1289, Type II, Class 1, Grade 2. The system shall have a minimum thickness of <br />1.5 inches and provide for a roof slope of 1/4 inch per foot. Acceptable types are <br />as follows. <br />Paratherm and Tapered Paratherm by Siplast; Irving, TX <br />b. Gypsum Sheathing Panel: A panel composed of a gypsum based, non-structural <br />water resistant core material integrally bonded with fiberglass mats on both sides <br />having a nominal thickness of 1/2 inch. The panel surface shall be factory <br />primed with a non -asphaltic primer. Acceptable types are as follows: DensDeck <br />Prime Gypsum Roof Board, by Georgia Pacific Corporation; Atlanta, GA <br />'D. Primers, Sealants and Adhesives for Bitumen Products <br />1. Insulation Adhesive: A single component, moisture cured, polyurethane foam <br />adhesive, dispensed from a portable, pre -pressurized container used to adhere <br />insulation panels to the substrate as well to other insulation panels. <br />X <br />Parafast Insulation Adhesive by Siplast, Irving, TX <br />2. Primer: An asphalt, solvent blend conforming to ASTM D 41 requirements. <br />Siplast PA -1125 Asphalt Primer by Siplast; Irving, TX <br />3. Primer for Self -Adhesive Sheets: A quick drying, low-VOC, water-based, high - <br />tack primer specifically designed to promote adhesion of roofing and <br />waterproofing sheets to approved substrates. Primer shall meet South Coast Air <br />Quality District and Ozone Transport Commission requirements. <br />TA -119 Primer by Siplast; Irving, TX <br />