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Title: Section 1517  •  Size: 4939

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SECTION 1517 - SHINGLES AND SHAKES

1517.1 General. Based on inspection of the existing roofing, the building official may permit the recovering of existing shingle or shake roofing in accordance with the provisions of this section.

1517.2 Asphalt Shingle Application. Not more than two overlays of asphalt shingles shall be applied over an existing asphalt shingle roof.

Not more than two overlays of asphalt shingle roofing shall be applied over wood shingles. Asphalt shingles applied over wood shingles shall have an overlay underlayment of not less than Type 30 nonperforated felt.

On structures with a slope of 2 units vertical in 12 units horizontal (16.66 % slope) or greater and having no more than one existing built-up roof, one overlay of asphalt shingles may be applied, provided:

1. If the built-up roof has a gravel surface, the gravel must first be spudded off to provide a smooth surface. All blisters and irregularities shall be cut and made smooth and secure and an underlayment of not less than Type 30 nonperforated felt shall be installed.

2. If the built-up roof has a smooth or cap-sheet surface, all blisters and irregularities shall be cut and made smooth and secure and an underlayment of not less than Type 30 nonperforated felt shall be installed.

1517.3 Wood Shake Application. Not more than one overlay of wood shakes shall be applied over an existing asphalt shingle or wood shingle roof [with one layer of 18-inch (457 mm), Type 30 nonperforated felt interlaced between each layer of shakes].

1517.4 Wood Shingle Application. Not more than one overlay of wood shingles shall be applied over existing wood shingles.

1517.5 Application over Shakes. New roof covering shall not be applied over an existing shake roof.

1517.6 Flashing and Edgings. Rusted or damaged flashing, vent caps and metal edgings shall be replaced with new materials as necessary.

1517.7 Reroofing. When the application of a new roof covering over wood shingle or shake roofs creates a combustible concealed space, the combustible concealed space shall be filled with the materials listed in Section 708.2.2.

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