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<br />075400.13 – 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 />A. Patches shall not be less than 6" by 6". Patches shall be centered over damaged area and extend a <br />minimum of 6" beyond the perimeter of damaged area. Round corners of patches and fully seal. <br /> <br />B. Other than the patches required by the membrane manufacturer at critical locations such as “T” <br />intersections of seams or corners of curbed equipment, at weld test cuts, and at welder starts and <br />stops, the number of allowable patches due to weld issues or membrane damages shall be limited <br />to 10 per 1,000 square feet on the main roof areas. If the number of patches exceeds this amount, <br />the Owner or Designer will review the installation and the cause for patches and may require that <br />the affected roof section be replaced in its entirety. <br /> <br />3.05 PIPE FLASHING <br /> <br />A. Form and install new pipe flashing, vent pipe flashing, etc. in accordance with the detail drawings. <br />Pre-fabricated boots for pipe penetrations, as supplied by the roof membrane manufacturer, shall <br />be the preferred flashing and shall be used when possible for vent pipe flashing. When a boot <br />installation is not feasible, field wrap the pipe penetration in accordance with the manufacturer's <br />requirements. <br /> <br />B. Flanges of pipe flashings shall be a minimum of 4″ in width and shall be fully heat welded to the <br />membrane. Provide securement of the membrane to the deck around pipe penetrations if/as required <br />by the membrane manufacturer. Provide required separation tape, sealants, and other accessories <br />for proper detail installation. <br /> <br />C. For hot pipe/high-temperature penetration flashings: If an existing sleeve is available and provides <br />as acceptable substrate for the new flashing, it may be reused. If an adequate sleeve is not available, <br />install a new metal sleeve as shown on the detail drawings. <br /> <br />3.06 DRAINS <br /> <br />A. Verify that existing drains are clear and free-flowing prior to the beginning of work and at the <br />completion of work. Any clogged or obstructed drains shall be brought to the attention of the <br />Owner. Drains clogged or obstructive after the beginning of work will be cleared with no cost to <br />the Owner. <br /> <br />B. Replace broken, missing, or damaged drain components. Replace plastic clamping rings and drain <br />strainers with cast iron strainers. Replacement, if necessary, must be approved by the Owner. <br /> <br />C. Remove the existing membrane around the drain. Install new membrane and drain target flashing. <br /> <br />D. Install sealant between the new membrane and drain bowl. Provide compression on the sealant. <br /> <br />E. Laps shall be located a minimum of 12" from the edge of the drain sump and 18″ from the edge of <br />the drain bowl. <br /> <br />F. Cut the membrane a minimum of 1" beyond the clamping ring and 1" in diameter larger than the <br />drain pipe. <br /> <br />DocuSign Envelope ID: 89558C18-938A-4BFF-B14A-A2214E8AA5DD