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RE: Snow Drift

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Todd, 

The slope is too small to be a major consideration.  The key parameter is
the height differential.

Regards,
Harold Sprague

> -----Original Message-----
> From:	Todd Hill [SMTP:thill(--nospam--at)tkarch.com]
> Sent:	Monday, April 24, 2000 1:19 PM
> To:	SEAINT (E-mail)
> Subject:	Snow Drift
> 
> I have two roofs sloping perpendicular to one another with a parapet wall
> in
> between.
> The upper roof is 5:12, the lower roof ( with an average height of 20 feet
> lower & Pg=25psf for both) is 3:12.
> In calculating snow drift, does it matter that the roofs are sloping
> perpendicular?
> Or is the key parameter just the difference in height?  
> 
> UBC 1641.3.2 covers nonparallel ridge lines where the roofs are
> "connected"
> (looking at figure A-16-12) almost treating it as sliding, but what if
> there
> is no connection to these roofs except from a parapet.
> 
>   _________
>   |____^____|   <Lower Roof
>   |       |       |
>   |       |       |            
>   |   <  |  >   |    <Upper Roof 
>   |       |       |
>   |____|____|     
>   
> (Excuse my crude sketch)
> 
> Any help would be appreciated.
> 
> Todd Hill
> TK Architects, Inc.
>