What Building Codes Are You Using?
United States
U.B.C. – Uniform Building Code – Central and West Regions
B.O.C.A. – Building Official Conference Associate – East Regions
N.B.C. – National Building Code – South East and South Regions
From National Building Code of CanadaSnow Exposure Factor – Changing from Ground Snow Load to Kpa = Roof Snow Load
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| Roofs located in generally open terrain extending one half mile or more from the structure | 0.6 | ||
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| Structures located in densely forested or sheltered areas | 0.9 | ||
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| All other structures | 0.7 | ||
FormulaSr + Ss X 20.9 X .8 = Live Load (From BOCA National Building Code 1993)