Snow loads acting on a sloping surface shall be assumed to act on the horizontal projection of that surface.
Sliding snow on sloping roofs.
Snow sliding off roofs can block pedestrian and vehicle.
It also discusses the dangers associated with sliding snow icicles ice dams and ice build up on sidewalks.
This digest discusses the mechanisms and forces involved when snow slides down smooth metal or glass roofs and shows how to compute the forces that sliding snow imposes on chimneys parapets and snow fences.
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.
P s c s p f.
Designing for snow on all such sloping roofs even on inclines as low as 10 calls for a double measure of caution.