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Insulation for RMH

 
                                
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Built the mock up/ test burn yesterday out of heavy fire brick. Im thinking of next stage now, how well would sand work around the burn tunnel /lower riser as an insulator thinking boxing it in with plywwod or maybe wonder board /durarock etc and then poring sand around it main reason sand = free, perlite while a much better insulator not free.
Gary.
 
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At $10 for an enormous bag it was nearly free when I bought it, however not sure how readily available it is everywhere.
 
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Isailli Hatfield wrote:main reason sand = free, perlite while a much better insulator not free.


Gary,
There's a simple answer: you need insulation which is heat-resistant at the same time. Sand is heat-resistant but no insulator, at all. It's quite good as mass when mixed with clay slip, dry it isn't useful for neither purpose.

Have you tried vermiculite?
 
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Where do yo get vermiculite?
 
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vermiculite is available at "big box" home centers as loose fill insulation in large! bags, perlite is in their garden center...
 
                                
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Not around here this time of year. I found a small bag at Ace hardware about the size of 12 oz of potato chips for $15 most of the nursery's are shut down till spring. what about a mason supply
I think only lowes has blown in insulation but it is cellulose not vermiculite nothing at the depot but fiberglass.

 
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