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// CODE SNIPPET

R905.7.3.2 Underlayment and High Winds

Minnesota Residential Code 2015 > 9 Roof Assemblies > R905 Requirements for Roof Coverings > R905.7 Wood Shingles > R905.7.3 Underlayment > R905.7.3.2 Underlayment and High Winds
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Underlayment applied in areas subject to high winds [above 110 mph (49 m/s) in accordance with Figure R301.2(4)A] shall be applied with corrosion-resistant fasteners in accordance with manufacturer's installation instructions. Fasteners are to be applied along the overlap not farther apart than 36 inches (914mm) on center.

Underlayment installed where the basic wind speed equals or exceeds 120 mph (54 m/s) shall comply with ASTM D 226 Type II or ASTM D 4869 Type IV. The underlayment shall be attached in a grid pattern of 12 inches (305 mm) between side laps with a 6-inch (152 mm) spacing at the side laps. Underlayment shall be applied in accordance with Section R905.2.7 except all Head laps shall be a minimum of 4 inches (102 mm). Underlayment shall be attached using metal or plastic cap nails with a head diameter of not less than 1 inch (25.4 mm) with a thickness of at least 32-gauge sheet metal. The cap-nail shank shall be a minimum of 12 gauge (0.105 inches) with a length to penetrate through the roof sheathing or a minimum of 3/4 inch (19 mm) into the roof sheathing.

Exception: As an alternative, adhered underlayment complying with ASTM D 1970 shall be permitted.

Related Code Sections


1507.4.5 Roof Assemblies and Rooftop Structures, Underlayment and High Wind
Underlayment shall comply with Section 1507.1.1 ...
2020 Minnesota Building Code > 15 Roof Assemblies and Rooftop Structures > 1507 Requirements for Roof Coverings > 1507.4 Metal Roof Panels > 1507.4.5 Underlayment and High Wind
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Underlayment applied in areas subject to high winds [ V asd greater than 110 mph (49 m/s) as determined in accordance with Section 1609.3.1] shall ...
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Underlayment applied in areas subject to high winds [above 110 mph (49 m/s) in accordance with Figure R301.2(4)A] shall be applied with corrosion ...
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R905.2.7.2 Roof Assemblies, Underlayment and High Winds
Underlayment applied in areas subject to high winds [above 110 mph (49 m/s) in accordance with Figure R301.2(4)A] shall be applied with corrosion ...
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R905.3.3.3 Roof Assemblies, Underlayment and High Winds
Underlayment applied in areas subject to high wind [above 110 miles per hour (49 m/s) in accordance with Figure R301.2(4)A] shall be applied ...
Minnesota Residential Code 2015 > 9 Roof Assemblies > R905 Requirements for Roof Coverings > R905.3 Clay and Concrete Tile > R905.3.3 Underlayment > R905.3.3.3 Underlayment and High Winds
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