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Re: pointed stem wall under a PEMB?

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I would not allow this method for frost alleviation;
maybe for expansive soils, where the expanding soil is
more likely to move around the "knife edge" than near
frozen soil.

Seems to me it would be less expensive to over
excavate and baqckfill with non-frost susceptible
backfill.

JPRiley



--- Jim Wilson <wilsonengineers(--nospam--at)yahoo.com> wrote:
> A contractor explained a detail to me today where
> the
> perimeter stemwall of a PEMB building was shaped
> with
> a pointed bottom at about 18" below grade in an area
> with 36" frost depth.  There is no footing under the
> stem.  The concept is that the frost heave will not
> push on the pointed bottom.
> 
> The steel frame still sits on concrete piers with
> footings, hairpins, etc.  The stem won't be figured
> in
> the structural load resisting system.
> 
> This sounds a little bit clever, but I'm not
> convinced.  He claims that he has used it before and
> it has been accepted (by the building inspector, the
> structural engineer, etc.)
> 
> Is there such a detail and does it actually work? 
> I'm
> suspicious, but who knows, maybe I learned something
> today...
> 
> Jim Wilson, PE
> Stroudsburg, PA
> 
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