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Biochar for insulation

 
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Would charcoal/BioChar work well if sandwiched between two thin sheets maybe having the char to be 10mm to 20mm thick and placed directly under iron roof sheeting to keep the interior of a brick walled room cool in hot climate conditions?
 
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This article suggests that it would work quite well.

https://www.architectmagazine.com/technology/the-benefits-of-biochar_o

John S
PDX OR
 
John Suavecito
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So does this article:

https://www.biochar-journal.org/en/ct/3

John S
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This tiny ad dresses like this just to get attention:
montana community seeking 20 people who are gardeners or want to be gardeners
https://permies.com/t/359868/montana-community-seeking-people-gardeners
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