Loads From Incline Roof

In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.

Loads from incline roof.

Load limits on the roof of a building. To do this i use conservative too heavy dead loads and full snow loads regardless of pitch. P s c s p f the thermal factor c t from table e 3 determines if a roof is cold or warm slippery surface values shall be used only where the roof s surface is unobstructed and sufficient space is. The sloped roof snow load p s shall be obtained by multiplying the flat roof snow load p f by the roof slope factor c s.

The final roof design loads shall not be less than 20 psf after all reductions are factored except for lyon storey counties. Ground snow loads p g for northern nevada locations 1. Technically you should use the actual rafter length when adding up the weight of roofing materials. In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.

Drift load design in the 30 psf zones may utilize asce 7 16 table c7 1 ground snow values. However in my practice i typically use the horizontal run of the roof for both types of load. Roofs are under a lot of pressure.