Roof Snow Load

Roof Snow Load

Some building codes and ASCE 7-95 specify an equation that takes into account the consequences of a structural failure in view of the end use of the building to be constructed and the wind exposure of the roof:

where

Ce = wind exposure factor (range 0.8 to 1.3)
Ct = thermal effects factor (range 1.0 to 1.2)
I   = importance factor for end use (range 0.8 to 1.2)
pf = roof snow load, lb per ft2
pg = ground snow load for 50-year recurrence period, lb per ft2