#1  
Old 09-19-2011, 04:29 PM
Serf
 
Join Date: Aug 2011
Location: Idaho
Posts: 18
Default Insulating hearth - Use firebricks instead of vermicrete?

Hi everyone,

My vermiculite/portland cement mix insulating hearth layer is thinner than I expected (2.5"). Instead of pouring another layer of the vermicrete, would an extra layer of firebricks work instead?

My setup would be like:

-2.5" vermiculite/portland cement
-4" firebrick layer
-4" firebrick layer (oven floor)

Thanks in advance!

Last edited by brennerwilliam; 09-19-2011 at 04:30 PM. Reason: Typo
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  #2  
Old 09-19-2011, 06:22 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Insulating hearth - Use firebricks instead of vermicrete?

"would an extra layer of firebricks work instead?"

It does not substitute for insulation. I would add another 1 1/2 or 2 inches of vermicrete. Having said that, if yours is a typical Pompeii oven, the 2 1/2 inches of insulation with the firebrick hearth on top should work OK.
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  #3  
Old 09-19-2011, 11:08 PM
Serf
 
Join Date: Aug 2011
Location: Idaho
Posts: 18
Default Re: Insulating hearth - Use firebricks instead of vermicrete?

Thanks Neil. I ended up pouring another 2 inches today after your advice.
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