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Underlayment shall be as defined in Section 1513. Underlayment shall be installed in compliance with the roofing component product approval and shall be in compliance with the following minimum requirements:
1518.2.1
Underlayment shall be attached to a nailable deck in a grid pattern of 12 inches (305 mm) between the overlaps, with 6-inch (152 mm) spacing at the overlaps.
1518.2.2
Where the architectural appearance of the underside is to be preserved, the underlayment shall be secured in accordance with Section 1519.5.2.
1518.2.3
Tin caps and nails or cap nails shall be as defined in Section 1517.5.2.
1518.2.4
Underlayment nails shall be as defined in Section 1517.5.1.

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