Division 7 Ebook Page 476 Fiberglass-Based Asphalt Shingles & Accessories, 07 31 00

Fiberglass-Based Asphalt Shingles & Accessories A. Prepare surfaces using the methods recommended by the manufacturer for achieving the best result for the substrate under the project conditions. B. Remove all existing roofing down to the roof deck. C. Verify installed roof deck is acceptable to receive shingles. Acceptable roof decks include the following: 1. Lumber sheathing: 6 in (152 mm) minimum width, 25/32 in (19.8 mm) minimum thickness. 2. Plywood sheathing: 3/8 in (9.5 mm) minimum thickness Exposure 1 grade plywood sheathing as recommended by APA and in compliance with applicable Codes. 3. OSB panels: 7/16 in (11.1 mm) minimum thickness non-veneer structural panels as recommended by APA and in compliance with applicable Codes. 4. Spacing between boards or panels shall not exceed 1/4 in (6.4 mm) between roof boards or between plywood or OSB sheathing panels. D. Verify that the deck is dry, structurally sound, clean and smooth. It shall be free of any depressions, waves, and projections. Cover with minimum 28 gauge; 0.0187 in (0.475 mm) galvanized steel, 0.0156 in (0.396 mm) stainless steel, or 0.0126 in (0.320 mm) aluminum sheet metal all holes 1 in (25 mm) or less in diameter, cracks over 1/2 in (13 mm) in width, loose knots and excessively resinous areas. Decking or deck boards with holes greater than 1 in (25 mm) in diameter shall be replaced. E. Verify that the deck is structurally sound and free of deteriorated decking. All deteriorated and damaged decking shall be removed and replaced with new materials. F. Clean deck surfaces thoroughly prior to installation of self-sealing ice and water barrier and underlayment. G. Verify that the existing shingles are dry, sound, clean and smooth. All curled, buckled or loose tabs shall be nailed down or removed. 3.3 UNDERLAYMENT APPLICATION A. Install in accordance with manufacturer's instructions. 1. Install using methods recommended by shingle manufacturer and in accordance with local building codes. When local codes and application instructions are in conflict, the local code requirements shall take precedence.

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