Snow sliding off roofs can block pedestrian and vehicle.
Sliding snow on sloping roofs.
Snow and ice sliding off sloped slippery roofs can damage property and injure people as far as 30 feet away from two story facilities.
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.
Designing for snow on all such sloping roofs even on inclines as low as 10 calls for a double measure of caution.
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.
It also discusses the dangers associated with sliding snow icicles ice dams and ice build up on sidewalks.
P s c s p f.