Roof Projections Snow

On roof slopes between 4 12 and 6 12 rough textured roofing materials work best.

Roof projections snow.

Flat roofs are particularly vulnerable to snow accumulation as are areas behind high parapets or other roof projections such as roof mounted mechanical equipment. According to fm global studies snow load is the most serious cause of roof collapse. For roof projections l u shall be taken equal to the greater of the length of. Asce 7 does not require snow drift to be considered for roof projections less than 15 feet long.

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. 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. Minimum roof snow load after the single heavy snow storm eventually the wind blows thermal effects have time to act and we then get p s on the roof. 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.

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Calculate sloped roof snow load. 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. A coun try wide snow load map has been published by the american national standards institute ansi 2. Roof slopes lower than 4 12 tend to perform well with metal roofs which are less prone to leakage and ice dam formation.

Snow loads acting on a sloping surface shall be assumed to act on the horizontal projection of that surface. The drift on the upwind side of rooftop units rtus is a windward drift as it is for parapet walls. If the address matches an existing account you will receive an email with instructions to reset your password. P s c s p f.

At these slopes snow creeps rather than slides and is easy to manage. This minimum roof load is a separate.