**construction or rain, not snow load 55 1.15 40 snow 47 1.15 30 snow 40 1.15 20 snow 40 1.25 20 rain or nstn. Total load(PSF) Duration factor Live load(PSF) NOTES: TheseoverallspansarebasedonNDS ‘01 with 4" nominal bearing each end, 24" o.c. spacing, a live load deflection limited to L/240 maximum and use lumber properties as follows: