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Drift and sliding snow loads on sloped roofs

Drift and sliding snow loads on sloped roofs

Drift and sliding snow loads on sloped roofs

I am just curious if we need to consider drift and sliding snow loads on lower sloped roof beside another higher sloped roof.

For example, I have two roofs w/ 12:12(low) & 8:12(high) as below:

           '               '
           '         8:12  'Ridge
           '               '
           '               '
-----------'               '
            \              '
 12:12       \             '
              \            '
               \           '
----------------           '
   Ridge       /           '
              /            '
             /             '
            /              '
------------               '

Do I need to consider drfit load (and sliding snow loads) on the lower roof? If so, is it a little bit smaller than what specified in ASCE7?

RE: Drift and sliding snow loads on sloped roofs

oops. the drawing messed up. the two ridges shoud be in 90 degree angles.

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