Snow Loads

 

S - design snow load on roofs, balconies, decks

ASCE 7 chapter 7
IBC section 1608

horizontal plane
no reductions

 

P_g - ground snow load

ASCE 7 figure 7.1
IBC figure 1608.2

annual probability of exceedence of 0.02  (mean recurrence interval of 50 years)

S = 0.7 P_g ... because accumulation on ground is often greater than above ground

 

I - snow importance factor based on occupancy category

ASCE 7 table 7-4

ASCE 7 section 1.5 and table 1-1
IBC section 1604.5 and table 1604.5