[Cob] Green insulation?

[Rodger Chenoweth]

Hi Anna,
Have you considered using cedar chips with clay slip?   
www.ravenisle.com/cob was a house I helped build... the entire second  
floor had 12" thick double stud walls where we placed plywood forms  
on either side, then poured premixed cedar chips, clay slip and a  
small amount of straw into the space.  The forms could be removed  
right away, and the wall held it's shape.  Once it dried, the end  
result was super easy to plaster, was really hard, and supposedly has  
an R value upwards of 24-30.  The Germans have been doing it for  
decades.

If you want to know more, let me know.

Cheers
Rodger

On 18-Feb-06, at 8:56 AM, Anna Young wrote:

> Thanks very much for all the replies on green or not-so-green  
> insulation! Lots of avenues for research there. Icynene doesn't  
> sound like the wonder product it was making itself out to be,  
> surprise surprise.
>
> We would like to use something that is fairly native to our coastal  
> BC site, instead of supporting high-energy mainstream building  
> practices, so I am thinking wool, hemp batts, or straw with clay  
> slip to fireproof. No idea how easy the first two will be to get  
> hold of round here. Has anyone used the straw/clay for insulation  
> packing? I am thinking of it for gable ends and roofs, packed  
> between studs and rafters.
>
> Anna
>
>
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