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<br />075400.11 – THERMOPLASTIC SINGLE-PLY ROOF SYSTEM <br /> <br />Project Manual for Whitted Building Roof Replacement <br />Orange County, Hillsborough, NC <br />Prepared by Atlas Engineering, Inc., 551-A Pylon Drive – Raleigh, NC 27606 <br />May 2022 <br /> <br /> <br /> <br /> <br />2.03 MEMBRANE SYSTEM INSTALLATION <br /> <br />A. Position single-ply membrane over roof area without stretching. Allow membrane to relax for a <br />minimum of one-half hour prior to any fastening, adhering, or seaming. Shingle all laps in the <br />direction of water flow starting at the drain or low point and working upslope. Extend the field <br />sheet a minimum of 2" up the vertical and fasten the membrane at the base of parapet walls, curbs, <br />etc. a minimum of 8" on center. <br /> <br />B. Fully-Adhered Installation: Position the membrane to allow for exposure of the underside of the <br />sheet. Apply a continuous coverage of membrane adhesive to the underside of the membrane and <br />a mirrored area of the prepared substrate/surface. Adhesive coverage shall be a minimum of 100 <br />sq. ft. per gallon net coverage for the membrane and mirrored substrate combined, or as <br />recommended by the roof system manufacturer. Do not allow the adhesive within a minimum of <br />3" from the edge of the membrane. Avoid holidays, globs, and puddles. Follow the manufacturer’s <br />instructions for determining sufficient adhesive tack/dryness for mating membrane with substrate. <br />Place membrane onto the substrate surface avoiding wrinkles and air pockets. Broom the adhered <br />portion of the membrane to insure full contact with the substrate and complete process by firmly <br />pressing the adhered membrane into place with a weighted roller in accordance with the <br />manufacturer’s instructions. <br /> <br />1. Adhesive is to be applied using rollers in accordance with the roof system manufacturer’s <br />instructions and recommendations. Do not pour adhesive out of buckets to roll in. The <br />amount of membrane and substrate that can be covered with adhesive at one time must be <br />determined by the method of application, the ambient temperature, humidity and number <br />of workers available. Only apply adhesives to areas which can be completely covered with <br />membrane within the same work day. <br /> <br />2. For adjacent membrane rolls, provide a minimum 3" lap, maximum 6" lap, at subsequent, <br />adjacent rolls of membrane. Do not apply adhesive to the lap “seam” areas of the <br />membrane that will be hot-air welded. <br /> <br />3. Track and record the amount of pails of adhesive used per square foot area by saving and <br />dating the tops of the adhesive pails. Note in daily logs the area of membrane installed <br />each day. Keep the dated lids from each day of membrane installation until the Designer <br />and/or Owner can verify conformance to the specified adhesive rate. <br /> <br />C. Once the membrane has been adhered to the substrate, clean area of the two membrane sheets to <br />be seamed with approved seam cleaner in accordance with the manufacturer’s instructions. Allow <br />cleaning solvents to dissipate and the seams to dry prior to initiating any field welding. <br /> <br />D. Hot-air weld membrane seam using an automatic hot air welder to provide a continuous, <br />homogeneous weld, a minimum of 1.5" in width; hand held welders to be used for small areas and <br />repairs only with a minimum of 2" width heat-weld. Welding equipment used must be acceptable <br />DocuSign Envelope ID: 89558C18-938A-4BFF-B14A-A2214E8AA5DD