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Unread 02-13-2013, 08:51 PM   #18
Thermal Mass
is one Smokin' Farker

 
Join Date: 02-05-13
Location: Jackson, WI
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Ever consider pearite?
We oven builders use it with portland to make insulating concrete.
It is very light and absorbs very little moisture (also used in potting soil for added "volume" and helps hold air)
Just my .02...

You would of course have to line the pearlite with something to hold it in place or protect it.
Back to the discussion of the "double wall".
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