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<br />075400.10 – 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 />5. Fasteners shall be installed as recommended by the manufacturer. If required for proper <br />fastener installation, pre-drill through the insulation and coverboard. Do not under drive or <br />overdrive fasteners, avoid cupping of plates. <br />6. Install additional fasteners and plates at the perimeter and corners. The perimeter is <br />minimum of 8′ wide for Roof Areas A and B, 4′ wide for Roof Areas C, D, E, and F, and <br />the corners are a minimum of 8′x8′ for Roof Areas A and B, and 4′x4′ for Roof Areas C, <br />D, E, and F. Verify perimeter and corner dimensions with the manufacturer. <br /> <br />D. Adhered Coverboard: <br />1. Coverboard shall be set into a continuous 3/4" wide bead of adhesive at a minimum rate of <br />one linear foot of adhesive for every one square foot of board in the field of the roof. The <br />insulation adhesive shall be installed at a maximum of 6" from the perimeter of the board. <br />Increase adhesive rates in the roof perimeter and corner areas as defined on the drawings, and <br />in accordance with the system manufacturer’s design recommendations, maximum spacing in <br />perimeter and corners of 6" and 4" respectively unless otherwise approved. <br />2. Do not apply the adhesive unless the temperature is 40 degrees Fahrenheit and rising. <br />3. Allow adhesive to rise approximately 1/8" and set boards into adhesive. Continue to install <br />boards into adhesive. <br />4. Place, do not slide, boards onto the adhesive and walk on the boards to spread the adhesive <br />for maximum contact. Evenly weight the boards to hold them in contact with the deck <br />until the second walking is performed (minimum 10 minutes after initial walk-in). <br />5. Avoid excessive scoring of the boards at uneven deck conditions. Provide additional weight <br />at areas requiring additional adhesion time. <br /> <br />E. When handling rigid insulation boards and coverboard, take care not to rupture/damage the facers of <br />the boards. Butt edges of boards without forcing joints. Cut boards to fit neatly to perimeter <br />blocking and penetrations through roof. Cut holes in the insulation for round penetrations (do not <br />install pieces). Miter board edges if necessary for proper fit at transitions in deck slope. Fill in gaps <br />between boards greater than 1/4" with insulation pieces or foam. Avoid the use of insulation pieces <br />with dimensions less than 18″. <br /> <br />F. Stagger board joints a minimum of 24″ throughout each layer and between layers. <br /> <br />G. Insulation and coverboard shall be installed to maintain the existing slope of the roof system. <br />Tapered insulation at drain sumps and isolated areas of supplemental tapered insulation are shown <br />on the drawings and should be provided to promote positive drainage. Check insulation surfaces as <br />each layer is installed to ensure that no unanticipated deflections, cambers, gaps, or other conditions <br />exist that may impede proper drainage. Install additional tapered insulation at isolated locations if <br />required to correct or improve drainage conditions in accordance with the estimated quantity of <br />work. <br /> <br />H. Night time tie-ins shall have temporary stagger in place and should use “fill in” courses that can be <br />removed when subsequent work begins. <br /> <br />I. Sweep all loose debris from the substrate between layers of insulation installation and prior to <br />installing the membrane. <br /> <br />DocuSign Envelope ID: 89558C18-938A-4BFF-B14A-A2214E8AA5DD