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1507.2 Asphalt Shingles
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The installation of asphalt shingles shall comply with the provisions of this section.
1507.2.1 Deck Requirements
Asphalt shingles shall be fastened to solidly sheathed decks.
1507.2.2 Slope
Asphalt shingles shall only be used on roof slopes of two units vertical in 12 units horizontal (17-percent slope) or greater. For roof slopes from two units vertical in 12 units horizontal (17-percent slope) up to four units vertical in 12 units horizontal (33-percent slope), double underlayment application is required in accordance with Section 1507.1.1.
1507.2.3 Underlayment
Underlayment shall comply with Section 1507.1.1.
1507.2.4 Asphalt Shingles
Asphalt shingles shall comply with ASTM D3462.
1507.2.5 Fasteners
Fasteners for asphalt shingles shall be galvanized, stainless steel, aluminum or copper roofing nails, minimum 12-gage [0.105 inch (2.67 mm)] shank with a minimum 3/8-inch-diameter (9.5 mm) head, of a length to penetrate through the roofing materials and not less than 3/4 inch (19.1 mm) into the roof sheathing. Where the roof sheathing is less than 3/4 inch (19.1 mm) thick, the nails shall penetrate through the sheathing. Fasteners shall comply with ASTM F1667.
1507.2.6 Attachment
Asphalt shingles shall have the minimum number of fasteners required by the manufacturer, but not less than four fasteners per strip shingle or two fasteners per individual shingle. Where the roof slope exceeds 21 units vertical in 12 units horizontal (21:12), shingles shall be installed as required by the manufacturer.
1507.2.7 Ice Barrier
Where required, ice barriers shall comply with Section 1507.1.2.
1507.2.8 Flashings
Flashing for asphalt shingles shall comply with this section. Flashing shall be applied in accordance with this section and the asphalt shingle manufacturer's printed instructions.
1507.2.8.1 Base and Cap Flashing
Base and cap flashing shall be installed in accordance with the manufacturer's instructions. Base flashing shall be of either corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness or mineral-surfaced roll roofing weighing not less than 77 pounds per 100 square feet (3.76 kg/m2). Cap flashing shall be corrosion-resistant metal of minimum nominal 0.019-inch (0.483 mm) thickness.
1507.2.8.2 Valleys
Valley linings shall be installed in accordance with the manufacturer's instructions before applying shingles. Valley linings of the following types shall be permitted:
- For open valleys (valley lining exposed) lined with metal, the valley lining shall be not less than 24 inches (610 mm) wide and of any of the corrosion-resistant metals in Table 1507.2.8.2.
- For open valleys, valley lining of two plies of mineral-surfaced roll roofing complying with ASTM D3909 or ASTM D6380 shall be permitted. The bottom layer shall be 18 inches (457 mm) and the top layer not less than 36 inches (914 mm) wide.
- For closed valleys (valleys covered with shingles), valley lining of one ply of smooth roll roofing complying with ASTM D6380, and not less than 36 inches (914 mm) wide or types as described in Item 1 or 2 above shall be permitted. Self-adhering polymer modified bitumen underlayment bearing a label indicating compliance with ASTM D1970 shall be permitted in lieu of the lining material.
VALLEY LINING MATERIAL
| MATERIAL | MINIMUM THICKNESS | GAGE | WEIGHT |
| Aluminum | 0.024 in. | — | — |
| Cold-rolled copper | 0.0216 in. | — | ASTM B370, 16 oz. per square ft. |
| Copper | — | — | 16 oz |
| Galvanized steel | 0.0179 in. | 26 (zinc-coated G90) | — |
| High-yield copper | 0.0162 in. | — | ASTM B370, 12 oz. per square ft. |
| Lead | — | — | 2.5 pounds |
| Lead-coated copper | 0.0216 in. | — | ASTM B101, 16 oz. per square ft. |
| Lead-coated high-yield copper | 0.0162 in. | — | ASTM B101, 12 oz. per square ft. |
| Painted terne | — | — | 20 pounds |
| Stainless steel | — | 28 | — |
| Zinc alloy | 0.027 in. | — | — |
For SI: 1 inch = 25.4 mm, 1 pound = 0.454 kg, 1 ounce = 28.35 g, 1 square foot = 0.0929 m2.
1507.2.8.3 Drip Edge
A drip edge shall be provided at eaves and rake edges of shingle roofs. Adjacent segments of the drip edge shall be lapped not less than 2 inches (51 mm). The vertical leg of drip edges shall be not less than 11/2 inches (38 mm) in width and shall extend not less than 1/4 inch (6.4 mm) below sheathing. The drip edge shall extend back on the roof not less than 2 inches (51 mm). Underlayment shall be installed over drip edges along eaves. Drip edges shall be installed over underlayment along rake edges. Drip edges shall be mechanically fastened at intervals not greater than 12 inches (305 mm) on center.
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