[GSBN] use of ashes in clay plasters and/or floors

Bob Theis bob at bobtheis.net
Thu Feb 5 13:43:58 CST 2009

I agree with Rob Tom's instinct, that once compressed, a layer of ash  
won' t have much air space to insulate.

But a related material,  that does make sense, is the use of  
charcoal. I've read the Romans used it in their villas. Would make a  
lot of sense for a hypocaust.

Bob Theis

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