[Greenbuilding] Biochar as Annual Cycle Building Dehumidifier

Reuben Deumling 9watts at gmail.com
Fri Jul 3 14:46:14 CDT 2015


Fascinating. What is 'clay slip'?

On Fri, Jul 3, 2015 at 12:42 PM, Koehn Chris <chris at koehn.com> wrote:

>
> We’ve recently completed a home using “chip and slip” walls: 12” deep
> Larsen trusses filled with wood chips coated in clay slip and manually
> compacted. The clay-straw / clay slip folk seem to be experimenting with
> variable ratios of clay vs. chips: I would quantify ours as “middling” -
> enough to bond the chips and a bit more. Not very scientific, sorry. Chip
> and slip was done last summer. Clay plasters are just about done being
> installed inside and out. Lots of mass, lots of clay.
> My understanding of clay is that it’s quite hygroscopic, holding as much
> as 5X it’s own weight in water. So the walls take on moisture over our wet
> winters and release it during our dry summers.
> It’s early days, and the house is just now being occupied, but already the
> owners report comfortable indoor humidity (and temperature).
> Since clay is readily available in most parts of North America, I’d
> consider it a better option than charred wood, based solely on it’s
> environmental impact.
>
> Regards,
>
> Chris Koehn
> TimberGuides
> Vancouver Island
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