AMENDMENTS TO THE BOCA NATIONAL BUILDING CODE/1996

CHAPTER 15 - ROOFS AND ROOF STRUCTURES

(Amd) 1507.4.3 Asphalt shingles: Asphalt shingles shall conform to ASTM D225 or D3462 listed in Chapter 35. Asphalt shingles shall not be installed on roof slopes below two units vertical in 12 units horizontal (2:12). Double-layer underlayment shall be required on roof slopes below four units vertical in 12 units horizontal (4:12). Single-layer underlayment is required on all other roof slopes. Asphalt shingles shall be secured to the roof with not less than four fasteners per strip shingle, or not less than two fasteners per individual shingle. Asphalt strip shingles shall have a minimum of six fasteners per strip shingle where the basic wind speed is 80 miles per hour or greater, as determined in accordance with Appendix A. Shingle headlap shall not be less than 2 inches.

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