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

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Ah, yes, the joy of "lake effect snow"!

Scott
Adrian, MI


On Wed, 21 Sep 2005, Gary Hodgson & Associates wrote:

> 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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