Drift and sliding snow loads on sloped roofs

[DavidStructural08]

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?

 

[DavidStructural08]

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