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I. For the plate-bonded system, fasten the insulation boards with corrosion-resistant screws and <br /> polymer-coated metal plates in the pattern as prescribed by the manufacturer to comply with <br /> the wind uplift design requirements. <br /> 3.04 FASTENERS: <br /> A. Fasteners shall be driven perpendicular to the work surface. <br /> B. The fastener assembly (distribution plates, batten bars, and screws)shall be installed so as to <br /> avoid abrasion to the membrane. <br /> C. The fastener manufacturer's recommendations shall be followed for: <br /> 1. Fastener suitability for the specific application <br /> 2. Proper drill bit for drilling correct hole size (diameter and depth) into concrete, light-weight <br /> concrete, gypsum, and cementitious/wood fiber decks. <br /> 3. Fastener length and minimum depth of embedment into deck to achieve required <br /> resistance to pull-out. <br /> 4. Installation tools. <br /> 5. Fasteners that are improperly installed (overdriven, underdriven, snapped, bent, <br /> disengaged) shall be removed or corrected. <br /> 3.05 COVER BOARD: <br /> A. Cover board units shall be loose laid over existing roof system membrane that has been <br /> prepared to receive the new roof assembly. <br /> B. Follow all manufacturer's specifications/for the tested system approved to meet or exceed the <br /> local code requirements for wind pressures and roof system attachment. <br /> C. No more insulation shall be applied than can be covered with the roof membrane by the end of <br /> the day or the onset of inclement weather. <br /> D. For the plate-bonded system, fasten the insulation boards with corrosion-resistant screws and <br /> polymer-coated metal plates in the pattern as prescribed by the manufacturer to comply with <br /> the wind uplift design requirements. <br /> E. The type and thickness rigid insulation shall be installed using mechanical fasteners or <br /> adhesives in accordance with the manufacturer's published specifications and shall meet the <br /> minimum design requirements specified. <br /> F. Insulation shall be adequately supported to sustain normal roof traffic without damage. <br /> G. For combustible decks, the fire rated board shall be installed directly below the membrane. <br /> H. Insulation shall be installed in parallel courses with end joints staggered and adjacent boards <br /> butted together with no joints greater than 1/4". <br /> I. Neatly fit insulation around all penetrations and nailers. Gaps exceeding '/4" shall be filled so <br /> that the membrane is properly supported. Provide tapered insulation at drains and on the high <br /> side of curbs. <br /> J. Per the manufacturer's guidelines, if necessary, gap joints in the cover board approximately <br /> 1/8"to allow for expansion and contraction. <br /> 3.06 MEMBRANE INSULATION: <br /> A. Placement: <br /> 1. The membrane shall be positioned so that the in-seam fasteners are perpendicular to the <br /> ribs of the metal deck or the 2x4 stringers of the plywood (OSB) deck. The membrane <br /> shall be cut to fit neatly around all penetrations and roof projections. The <br /> manufacturer/supplier shall be consulted regarding the positioning of the membrane to <br /> allow for the most effective pattern, orientation, and width limitation of the sheets, the <br /> layout of the fastening system, and the fastener requirements. <br /> SEA00511 / Prologis - SEA00511 07 5400 - 9 THERMOPLASTIC MEMBRANE <br /> - FY24- Everett 1 - Capital ROOF SYSTEM <br /> Roofing Project <br />