[GSBN] Under slab and edge insulation at doorways

[M Oehlmann]

Hi Kelly and all,

two cents maybe be too much here, as I used Perlite under the strawbales in
a woodden ladder frame on the foundation. The idea had been to minimize
damage of exposing strawbales directly on the moisture barrier of the
foundation with the potential of a failing lime render test. And indeed
after the render failed, Perlite helped drying out the walls and once dry
again, the thermal properties are back to normal.

We sometimes use Perlite mixed in a lime-slab for the floors, which works
fine.

Best wishes,

Martin Oehlmann


2011/2/8 Kelly Lerner <klerner at one-world-design.com>

> Hi all,
> In an effort to get away from the global warming potential of and fire
> retardants in rigid insulation, I'm beginning to design with compacted
> perlite as under-slab insulation in strawbale houses in Spokane, WA (east
> side of WA - cold winter - 6800 heating degree days, high desert, dry -
> about 16" rain/year, water table is usually quite low and soils are well
> drained).
>
> I've found a relatively local source for perlite(Portland) and the costs
> for R-value are comparable to or less than rigid insulation. I'm installing
> perlite under the slab and wrapping it up the edge of the slab (on the
> interior of the stem wall - under the strawbale wall), but I'm having
> trouble detailing "slab edge insulation" at the door ways. Anyone have any
> experience or thoughts about the right approach? Contact me on or off list.
> Thanks!
>
> In case you're wondering about perlite, here's a link:
> http://www.perlite.com/faqs.htm
>
>
> Kelly Lerner, Architect
> One World Design Architecture
> 509-838-8812
> www.one-world-design.com
>
> Have you read Natural Remodeling for the Not-So-Green House? Available in
> Bookstores across the Universe.
> www.naturalremodeling.com
>
>
>
>
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