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Code Considerations

Prescriptive specifications for structural member connections based on regionalized wind speeds are contained in the IRC. Both the IRC and roofing product manufacturers prescribe minimum fastener specifications.

Underlayment should be tested to ASTM D-226, D-2626, D-4869, or D-1970 and installed per manufacturer's specifications. In climates where the average daily temperature is 25°F or less in January, a 24" modified bitumen sheet (self-adhering ice and water barrier) is required around the roof perimeter to preclude water infiltration from melting ice dams.

The IRC is very specific about flashing size, material, and location.

The IRC prescribes tests that asphalt, tile (clay and concrete), wood, and metal shingles, and mineral-surface rolled roofing should conform to assure weatherization durability, as well as appropriate roof pitches for the product types.

Certain coastal tiers of Texas and Florida have specific, prescriptive codes covering products and installation in high wind areas. In Texas, asphalt shingles must conform to ASTM D-3161 testing. Florida maintains lists of approved roofing materials.

Content updated on 1/12/2006

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