Calculate sloped roof snow load.
Roof projections snow.
A coun try wide snow load map has been published by the american national standards institute ansi 2.
The drift on the upwind side of rooftop units rtus is a windward drift as it is for parapet walls.
Roof slopes lower than 4 12 tend to perform well with metal roofs which are less prone to leakage and ice dam formation.
Sloped roof snow loads calculations and regional design.
Asce 7 does not require snow drift to be considered for roof projections less than 15 feet long.
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This minimum roof load is a separate.
The drift on the downwind side is a somewhat reduced leeward drift composed of snow originally on the roof upwind of the rtu plus a small contribution from snow originally on top of the rtu itself.
Snow loads acting on a sloping surface shall be assumed to act on the horizontal projection of that surface.
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According to fm global studies snow load is the most serious cause of roof collapse.
P s c s p f.
We routinely raise the bottom of roof screen walls by about 3 feet or above the flat roof snow height in order to avoid drifting snow against the screen wall.
Flat roofs are particularly vulnerable to snow accumulation as are areas behind high parapets or other roof projections such as roof mounted mechanical equipment.
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.
Ps pfcs where psis in pounds per square foot of horizontally projected roof area 3 check for unbalanced snow load assuming wind can blow from any direction hip and gable roofs curved roofs multiple folded plate roofs sawtooth roofs barrel vault roofs and dome roofs see section 7 6 of asce 7.
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Economical structural design in these areas requires an accurate prediction of the ground snow plus an understanding of how the snow is distributed on the roofs.
For roof projections l u shall be taken equal to the greater of the length of.
On roof slopes between 4 12 and 6 12 rough textured roofing materials work best.
This is the same general concept your colleague is suggesting.
