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Gateway Park Center PERKINS+WILL <br /> 810495.000 <br /> 12/06/18 <br /> <br /> <br />STYRENE-BUTADIENE-STYRENE (SBS) MODIFIED BITUMINOUS MEMBRANE ROOFING <br /> 07 52 16 - 11 <br /> <br /> <br />C. Insulation Cant Strips: Install and secure preformed 45-degree insulation cant <br />strips at junctures of roofing system with vertical surfaces or angle changes greater <br />than 45 deg F. <br />D. Installation Over Metal Decking: <br />1. Install base layer of insulation with joints staggered not less than 24 inches in <br />adjacent rows and with long joints continuous at right angle to flutes of <br />decking. <br />a. Locate end joints over crests of decking. <br />b. Trim insulation neatly to fit around penetrations and projections, and to <br />fit tight to intersecting sloping roof decks. <br />c. Make joints between adjacent insulation boards not more than 1/4 inch <br />in width. <br />d. At internal roof drains, slope insulation to create a square drain sump, <br />with each side equal to the diameter of the drain bowl plus 24 inches. <br />1) Trim insulation, so that water flow is unrestricted. <br />e. Fill gaps exceeding 1/4 inch with insulation. <br />f. Cut and fit insulation within 1/4 inch of projections, and penetrations. <br />g. Mechanically attach base layer of insulation and substrate board using <br />mechanical fasteners specifically designed and sized for fastening <br />specified board-type roof insulation to metal decks. <br />1) Fasten insulation according to requirements in FM Approvals' <br />RoofNav for specified Windstorm Resistance Classification. <br />2) Fasten insulation to resist specified uplift pressure at corners, <br />perimeter, and field of roof. <br />2. Install upper layers of insulation and tapered insulation, with joints of each <br />layer offset not less than 12 inches from previous layer of insulation. <br />a. Staggered end joints within each layer not less than 24 inches in <br />adjacent rows. <br />b. Trim insulation neatly to fit around penetrations and projections, and to <br />fit tight to intersecting sloping roof decks. <br />c. Make joints between adjacent insulation boards not more than 1/4 inch <br />in width. <br />d. At internal roof drains, slope insulation to create a square drain sump, <br />with each side equal to the diameter of the drain bowl plus 24 inches. <br />e. Trim insulation, so that water flow is unrestricted. <br />f. Fill gaps exceeding 1/4 inch with insulation. <br />g. Cut and fit insulation within 1/4 inch of projections, and penetrations. <br />h. Adhere each layer of insulation to substrate using adhesive according to <br />FM Approvals' RoofNav assembly requirements and FM Global Property <br />Loss Prevention Data Sheet 1-29 for specified Windstorm Resistance <br />Classification, as follows: <br />1) Set each layer of insulation in a uniform coverage of full -spread <br />insulation adhesive, firmly pressing and maintaining insulation in <br />place.