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Return to Perka Library 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 Canada Snow Exposure Factor – Changing from Ground Snow Load to Kpa = Live Load

Roofs located in generally open terrain extending one half mile or more from the structure 0.6

Structures located in densely forested or sheltered areas 0.9

All other structures 0.7

Formula Sr + Ss X 20.9 X .8 = Live Load (From BOCA National Building Code 1993)
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