2022-286-E-AMS-Owens Roofing-Whitted complex roof replacement

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075400.5 – THERMOPLASTIC SINGLE-PLY ROOF SYSTEM Project Manual for Whitted Building Roof Replacement Orange County, Hillsborough, NC Prepared by Atlas Engineering, Inc., 551-A Pylon Drive – Raleigh, NC 27606 May 2022 fastening. Foam core shall have a flame spread of 25 or less per ASTM E-108 and shall have a minimum density of 2 pcf. Compressive strength shall be 20 psi minimum in accordance with ASTM D1621. Board insulation shall conform to ASTM 1289, Type II, Class 1, Grade 2. Base layer insulation for all Roof Areas shall be 2″ thick. Additional layer of polyisocyanurate insulation on Roof Area C shall be 2” thick. Tapered insulation for Roof Areas D, E, and F shall be 1/4″ per foot with a 2″ minimum thickness. Total thickness on Roof Areas A and B shall be 2″ at the edge of the sump/gutter. Total thickness on Roof Areas C, D, E, and F shall be 4″ at the edge of the sump/gutter. The saddles/crickets shall be 1/2″ per foot tapered insulation. The base and fill insulation may be 4′x8′ and the tapered insulation shall be 4′x4′. D. Coverboard (Install over saddles/crickets): Shall be a non-structural, fire-rated, fiberglass-faced gypsum product with a silicone-treated, water-resistant gypsum core. Shall have factory-laminated fiberglass surface mats, front and back. Overlayment shall be factory-primed. Thickness of overlayment shall be 1/2″. Board shall meet or exceed the requirements of ASTM C1177 and ASTM D3273. Board shall have a flame spread of 0 and smoke developed rating of 0 in accordance with ASTM E84. Board shall be specifically designed for use in roof assemblies and shall be approved by the roof membrane manufacturer. Maximum board size of 4'x4' for adhered applications. E. Adhesive for coverboard attachment: Provide low-rise polyurethane adhesive specifically designed for bonding specified cover board to roof insulation. Adhesive shall be pre-approved by the roof system manufacturer for use with the proposed system, insulation, and existing deck conditions. Adhesion testing will be required. F. Fasteners and Plates: Shall be corrosion-resistant, 14-10 heavy duty all-purpose screw or nail-in fastener with low profile head and minimum 2.5″ diameter galvanized steel, or AZ 55 galvalume stress plate. Fasteners shall be carbon steel, coated to resist corrosion in accordance with FM4470. Fastener and plate shall be Factory Mutual approved for use together. Fasteners must be intended for securement of insulation into a wood and metal deck and be approved for use with the intended insulation and by the membrane system manufacturer. Fastener shall be of sufficient length to penetrate through the required layers of insulation/coverboard and into the top of the deck a minimum of 1.25″ and a maximum of 2″ unless otherwise required by the fastener manufacturer. Pull out testing of the fastener into the decks will be required for final confirmation of fastener spacing and pattern. G. Tapered Edge Strips: Closed-cell polyisocyanurate rigid insulation with foam core and factory laminated fiberglass facers acceptable for installation by mechanical fastening. Foam core shall have a flame spread of 25 or less per ASTM E-108 and shall have a minimum density of 2 pcf. Compressive strength shall be 20 psi minimum in accordance with ASTM D1621. Thickness shall be 0″-1.5″ 2.02 ROOF MEMBRANE AND ACCESSORIES A. Membrane: Roof membrane shall be a thermoplastic polymeric single-ply polyvinyl chloride (PVC) or ketone ethylene ester (KEE) membrane with fiberglass or polyester reinforcement, meeting ASTM D4434 (PVC) or D6754 (KEE) and the technical membrane properties specified. The membrane shall be acceptable for adhered applications. Membrane color will be confirmed during the pre-job submittal process. For the purpose of bidding, it is anticipated that the color selected will be a standard color such as white or off-white. DocuSign Envelope ID: 89558C18-938A-4BFF-B14A-A2214E8AA5DD