#1  
Old 02-26-2011, 03:45 PM
Serf
 
Join Date: Feb 2011
Location: CA
Posts: 4
Default Pouring the Hearth

Hello,

I would like the experts opinion about the following question:

In section 4 of the instructions for Pompeii oven, 2 alternatives are provided:
1) Using FB board, or alternatively,
2) using insulating concrete (cement plus vermiculite).

I have seen a 3rd option in books about earth ovens (using empty bottles plus perlite and clay slip).

What do you think?
Is there any discussion of this or other techniques in this forum?

Thanks,
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  #2  
Old 02-26-2011, 05:06 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Pouring the Hearth

1) Use FB board, or alternatively,
2) use insulating concrete (cement plus vermiculite/perlite)
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  #3  
Old 02-26-2011, 05:23 PM
Serf
 
Join Date: Feb 2011
Location: CA
Posts: 4
Default Re: Pouring the Hearth

Thanks for your reply, but I was trying to get some opinions on option 3 (bottles plus perlite and clay slip).
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  #4  
Old 02-26-2011, 07:05 PM
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Location: New Jersey USA
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Default Re: Pouring the Hearth

Glass, broken or in bottle form is not an insulator. Clay isn't either. Neither is sand, or gravel, or broken masonry, or rock salt.

We aren't living in the middle ages. We have access to modern materials, and we should use them. The cost of insulation is small compared to the cords of firewood you would have to burn to heat up an uninsulated oven.
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