I am having trouble understanding a concept related to a sample question in the NCARB ARE 5.0 Handbook for PDD.
The sample question below asks: if the design snow load is 60 psf, what is the total snow load per linear foot on the ridge beam?
When I initially tried solving this, I used the total span and calculated: 20 FT x 60 LB/SF = 1200 LB/FT
However, the NCARB Handbook says to use half the length (the length of one rafter) and calculate: 10 FT x 60 LB/SF = 600 LB/FT
Why use the length of one rafter instead of the total length?
Looking for a different explanation to help me understand.
Please sign in to leave a comment.