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American Wood Council

Explain the Exposure Category that has 1500' criteria.

Exposure B as defined in ASCE 7-10 section 26.7.3: For buildings with a mean roof height of less than or equal to 30ft., Exposure B shall apply where the ground surface roughness, as define by Surface Roughness B, prevails in the upwind direction for a distance greater than 1,500 ft.

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