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<br />075400.9 – 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 />C. Verify that elements penetrating the roof are solidly set and do not have visible damage. Raise all <br />curbs and other penetrations to provide vertical flashing heights of a minimum of 8" above the <br />finished roof surface. <br /> <br />D. Replace plywood and blocking at locations where existing materials are damaged, deteriorated, or <br />do not meet the specified requirements in accordance with Section 061140. <br /> <br />E. Organize work such that no foot traffic will occur on completed roof areas. Foot traffic over newly <br />installed membrane shall not be allowed. <br /> <br />F. Do not apply roofing materials to surfaces which are damp, frozen, dirty, dusty, or otherwise <br />unacceptable to roof system manufacturer or Engineer. Beginning installation means acceptance of <br />existing conditions. <br /> <br />3.02 THERMAL BARRIER, INSULATION, AND COVER BOARD INSTALLATION <br /> <br />A. Install thermal barrier, insulation boards, and coverboard in accordance with roof membrane <br />manufacturer’s installation instructions, approved fastener patterns, and this specification section. <br />Install no more insulation than can be covered with roof membrane and completed before the end of <br />the day’s work, or before the onset of inclement weather. <br /> <br />B. Thermal Barrier: <br />1. Place the thermal barrier over the roof deck. The long dimension of boards shall be installed <br />perpendicular to the planned layout of the membrane seams. Stagger end joints of adjacent <br />boards a minimum of 24". <br /> <br />C. Base/Tapered Layer Insulation: <br />1. Install the flat and tapered insulation boards in accordance with the roof membrane <br />manufacturer’s installation instructions, the approve tapered insulation layout and this <br />specification section. Install no more insulation than can be covered with roof membrane and <br />complete before the end of the day’s work, or before the onset of inclement weather. <br />2. The long dimension of board shall be installed perpendicular to the planned layout of the <br />membrane seams. Stagger end joints of adjacent boards a minimum of 24". <br />3. Mechanically fasten the base layer and tapered insulation to the existing deck at a minimum <br />rate of one fastener and plate every 2.67 square feet of maximum contributory area per <br />fastener (approximately 12 fasteners per 4'x8' board in the field of the roof), unless <br />otherwise approved by the Designer based on pull out test data. Additional fasteners and <br />plates shall be installed at perimeters and corners as follows (minimum 16 fasteners per <br />4’x8’ board in the perimeters and minimum 20 fasteners per 4’x8’ board in the corners). <br />Fastener rates should be increased or may be decreased based on pull-out test values and <br />approvals from the roof system manufacturer and Designer. <br />4. Fasteners shall be positioned no closer than 6" from the perimeter of the board for a 4’x8’ <br />board and no closer than 12″ from the perimeter for a 4’x4’ board, and shall follow <br />insulation manufacturer’s fastener patterns. <br />DocuSign Envelope ID: 89558C18-938A-4BFF-B14A-A2214E8AA5DD