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Snow Drift Loads
2

Snow Drift Loads

Snow Drift Loads

(OP)
How do I go about finding the drift load on a flat roof that is beside a building with a higher sloped roof?

RE: Snow Drift Loads

IRSCOOBY2:  Treat it as a liquid that places a pressure on the roof.  Since the drift probably is irregular in depth, you will have to take averages for the depth.  Since 11 inches of snow equals 1 inch of water the density is one eleventh that of water.  Note that this 11:1 ratio is only typical  for new snow.   If the snow is compacted, "wet",or partially ice the ratio will be different.

Hope this gets you started


Regards
Dave

RE: Snow Drift Loads

2
Section 7 of ASCE 7-02 addresses snow loads on buildings.  Section 7.7 shows you how to determine drift lengths, intensity, etc.  Density is defined in this section as a function of the ground snow for your area.

I don't actually own the following publication, but ASCE also sells a book from their website titled "Snow Loads: A Guide to the Use and Understanding of the Snow Load Provisions of ASCE 7-02".  I have the similar wind loading guide and it is pretty helpful, so I would assume the snow load guide is equally helpful.

Good Luck  

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