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RE: snow drift and adjacent buildings

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Title: Message
Another question regarding this:  Does section 7.7.2 apply if the taller building has a parapet?

From: Martin Li [mailto:mli(--nospam--at)]
Sent: Thursday, November 08, 2007 4:02 PM
To: seaint(--nospam--at)
Subject: RE: snow drift and adjacent buildings

The length of upper roof (Lu) should include the separation distance (s).  The reduced drift load = [(20 – s) / s] pd.




-----Original Message-----
From: Alden Manipula [mailto:amanipula(--nospam--at)]
Sent: Thursday, November 08, 2007 3:23 PM
To: seaint(--nospam--at)
Subject: snow drift and adjacent buildings


Listers, i have a question regarding snow drifts and adjacent buildings.


Section 7.7.2 of ASCE 7-05 states "The seperation distance, s, between the roof and adjacent structure...shall reduce applied drift loads on the lower roof by a factor of (20s)/20 where s is in ft." 


So, w/ Figure 7-8 as a reference, where would s come into play?  Would it be added to the length of the upper roof, Lu.  Or is it part of the width of the drift, w?  Or do i calc the drift as if the building were tight agaisnt each other, as shown in Fig. 7-8, and just reduce the drift load by a factor of s?


Does that make sense to anyone?