Cob: frost free shallow foundation

[Howard]

So what you need is a foundation that goes down 4 feet or so to get below the frost
line.  Typically a rigid foundation stem wall is built on a concrete footing below
the frost line, "4 feet or so."  Wright used "structural fill," sharp gravel, under
his footing to drain any water away that might freeze and heave the foundation.  If
you take this structural fill down, the width of the footing, below the frost line
you have structure, you have a foundation that will not heave in the freeze/ thaw.
You also have a foundation that will fare better in an earthquake.

Howard Switzer

sarah kercheval wrote:

> Does anyone know a great deal on the subject of Frank lloyd Wright's shallow
> frost free foundation?
> I'm in the Arctic of Minnesota, so keep in mind that normal frost footings
> go down about 4 feet or so.
> thanks
> sarah
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.