WOOD BEAM SIZINGTM   WEIGHT module

SNOW LOAD
0	20	30	50	70
pounds per square foot
DEAD LOAD
7	10	20	23	30
pounds per square foot

CONSTRUCTION LOAD

Even in climates with no snow, a minimum roof live load of 12 to 20 psf (depending on size of tributary area) is necessary to support temporary construction materials and workers.

WBS calculates and uses the minimum load, when ground snow load is less than 20 psf.