Community College of Allegheny County Pittsburgh, Pennsylvania
2022 Library Roofing Project
C.
Perimeter/Projection Attachment: 1.
Mechanically attach roofing membrane at roof perimeters, curbs, and pipe/stack penetrations greater than 12 inches in diameter, on both sides of expansion joints and other areas where the membrane must be anchored to prevent movement, stress or damage to the roofing membrane. 2. Provide mechanical attachment at deck angle changes in excess of a 2 in 12 slope (including drain sump areas). 3. Follow the recommendations of Factory Mutual Loss Prevention Data Sheets 1-28, 1- 49 and 1-29. Prepare substrate around each roof drain to prevent membrane bridging or distortion and to provide a smooth transition from the roof surface to the drain clamping ring. 2. Remove existing flashing and bituminous materials from drain components down to bare clean metal. 3. Install tapered edge strip around drain to create approximate 48 inch by 48- inchsump. Miter corners. 4. Install minimum 1/2-inch bead of drain sealant over entire drain bowl rim(approximately 1/2 tube per drain). 5. Install 2-piece drain flashing detail. a. Roof Drain Detail: 1. Terminate field membrane along outside edge of sump. Install target patch consisting of unreinforced KEE flashing membrane over drain sump and past drain bowl rim. Extend flashing a minimum of 3 inches outside of the sump area and heat weld to field sheet. 6. Clamp flashing collar to drain. Fully compress drain sealant between the new membrane and the drain bowl rim forming a solid seal between the two. Evenly compress the assembly to avoid cracking or breaking the clamping ring. Replace cracked or broken drain clamping rings. a. All bolts and/or clamps must be in place in order to provide constant, even compression. Missing drain bolts and clamps shall be replaced. 7. Neatly cut membrane within drain at rim. Membrane to extend 1 inch into bowl. 8. For working drains, remove drain plug upon completion of work each day. 9. Plug new drains to prevent water entry until service connection is completed. Clean seam areas, overlap roofing membrane, and hot-air weld side and end laps of roofing membrane according to manufacturer's written instructions to ensure a watertight seam installation. 2. All surfaces shall be clean and dry. Ensure both mating surfaces are free of debris and no moisture is present on the splicing surfaces. a. Membrane Seaming: 1. Using a clean rag saturated with appropriate cleaner, thoroughly clean seam area at least 4 inches wide on both sheets. Change rags frequently to avoid depositing previously removed materials.
D.
E.
07540-11 THERMOPLASTIC MEMBRANE ROOFING
February 2022
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