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Title: Section 1504  •  Size: 6429

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SECTION 1504 - ROOF-COVERING CLASSIFICATION

1504.1 Class A Roof Covering. A Class A roof covering shall be one of the following roofings:

1. Any Class A roofing assembly.

2. Asbestos-cement shingles or sheets.

3. Exposed concrete slab roof.

4. Sheet ferrous or copper roof covering.

5. Slate shingles.

6. Clay or concrete roof tile.

1504.2 Class B Roof Covering. Class B roof shall be any Class B roofing assembly.

1504.3 Class C Roof Covering. Class C shall be any Class C roofing assembly.

1504.4 Nonrated Roof Covering. A nonrated roof covering shall be one of the following roofings:

1. Any mineral aggregate surface built-up roof for application to roofs having a slope of not more than 3 units vertical in 12 units horizontal (25% slope) applied as specified in Section 1507.6, consisting of not less than the following:

Roofing Plies
Three layers of felt, and

Surfacing Material
300 pounds per roofing square (14.6 kg/) of gravel or other approved surfacing material, or 250 pounds per roofing square (12.2 kg/) of crushed slag.

2. Modified bitumen membrane assemblies not meeting Class A, B or C roofing.

3. Thermoplastic membrane assemblies not meeting Class A, B or C roofing.

4. Thermoset membrane assemblies not meeting Class A, B, or C roofing.

5. Wood shingles.

6. Wood shakes.

1504.5 Special-purpose Roofs.

1504.5.1 Wood shakes and shingles with nonbituminous saturated felt.

1504.5.1.1 Wood shakes. Special-purpose wood shake roofing shall conform to grading and application requirements of this chapter except that nonbituminous saturated felt is to be substituted for the asphalt felt specified in Section 1507.12. In addition, the deck shall be constructed of 19/32-inch (15 mm) wood structural panels with exterior glue or 1-inch (25 mm) nominal tongue-and-groove boards overlaid with a layer of approved nonbituminous saturated felt lapped 2 inches (51 mm) on the horizontal and vertical joints. An 18-inch-wide (457 mm) strip of the same felt shall be shingled in between each course of shakes in such manner that no felt is exposed to the weather.

1504.5.1.2 Wood shingles. Special-purpose wood shingle roofing shall conform to grading and application requirements of this chapter. In addition, the deck, whether of spaced boards or solid, shall be overlaid with a layer of approved nonbituminous saturated felt lapped 2 inches (51 mm) on the horizontal and vertical joints.

1504.5.2 Wood shakes or shingles with gypsum board underlayment. Special-purpose wood shake or wood shingle roofing shall conform to the grading and application requirements of this chapter. In addition, an underlayment of 1/2-inch (12.7 mm) Type X gypsum board shall be placed under 15/32-inch (11.9 mm) wood structural panel solid sheathing or 1-inch (25 mm) nominal spaced sheathing.

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