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# Re: ground snow v. roof snow - which is it?

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• To: <seaint(--nospam--at)seaint.org>
• Subject: Re: ground snow v. roof snow - which is it?
• From: "Gary Hodgson & Associates" <ghodgson(--nospam--at)bellnet.ca>
• Date: Wed, 21 Sep 2005 07:29:13 -0400
• Priority: normal

```Gee, we design for more than that here in the
south part of the Niagara Peninsula.  Oops, I
forgot we are next door to Buffalo :-)
Gary

On 20 Sep 2005 at 9:40, Drew Morris wrote:

> Jim Wilson wrote:
>
> >I'm under the impression that typical roof span charts
> >for wood rafters, beams, etc. are based on ground snow
> >load.  At least that's what the tables say.  That
> >seems misleading since using the ASCE formula, one
> >could reduce that by 0.7 or more for roof loading.
> >I'm guessing that the prescriptive code takes the
> >conservative route by making no adjustment for roof
> >snow factors.
> >
> >Similarly, if "engineering" a wood roof, should the
> >same adjustment factors be ignored to maintain a
> >conservative consistency?  Maybe there is a commentary
> >on this some where.
> >
> >Just curious...
> >
> >Jim Wilson, PE
> >Stroudsburg, PA
> >
> >
> >
> In Alaska, Anchorage and Juneau specify a ground snow load and a
> minmimum roof snow load.  The roof snow load is calculated using ASCE
> 7, Section 7. In Anchorage, the ground snow load (Pg) is 50 psf and
> the minimum design roof snow load (Pf) is 40 psf.
>
>
>
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```