In this post, I will provide a brief overview of calculating flat roof snow loads that are specified in ASCE 7-10, Chapter 7. Before diving deeper, it’s a good idea to review the definitions of parameters used in the snow load formula.

## Parameter Definitions

C_{e} = Exposure Factor, ASCE 7-10 Table 7-2

C_{t} = Thermal Factor, ASCE 7-10 Table 7-3

I_{s} = Importance Factor, ASCE 7-10 Table 1.5-2

p_{g} = Ground Snow Load, ASCE 7-10 Figure 7-1 and Table 7-1

## Flat Roof Snow Load Formula, ASCE 7-10, Equation 7.3-1

p_{f} = 0.7C_{e}C_{t}I_{s}p_{g}

Flat Roof Snow Load = 0.7 times the exposure factor times the thermal factor times the importance factor times the ground snow load