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-   -   Hearth construction question (http://www.fornobravo.com/forum/f8/hearth-construction-question-17464.html)

davidwilcox123 03-09-2012 05:28 PM

Hearth construction question
 
Building a 38" pompeii. Base is built. Using one layer of high-duty bricks for insulation layer. It was suggested to me to put a piece of hardibacker down on top of the insulation bricks and then build the oven on top of the hardibacker. Please let me know your thoughts. Thanks in advance!

Mike D 03-13-2012 08:15 PM

Re: Hearth construction question
 
You might want to read up a little bit more before you start your build. Any type of bricks are not used for insulation (they create more thermal mass). If you don't use an insulation layer under your oven it will take forever to heat up and keep hot. Use the insulating board or make a layer with vermiculite/pearlite.
-I don't think hardibacker board is rated to get that hot (it might fall apart).

Good luck
Mike

Les 03-13-2012 08:35 PM

Re: Hearth construction question
 
Quote:

Originally Posted by davidwilcox123 (Post 128504)
It was suggested to me to put a piece of hardibacker down on top of the insulation bricks and then build the oven on top of the hardibacker.

I'm curious, who is this person? It defies everything we have learned, and built upon, from this site. You can download the plans from the FB store (free). And as Mike has suggested, read up a little more.

GianniFocaccia 03-13-2012 10:16 PM

Re: Hearth construction question
 
You may be confusing High-Duty Bricks for insulating firebricks. Just know that insulating firebricks (IFB) have the same r-value as vermicrete and while wonderfully uniform in construction and able to withstand compression, need to be at least 4" thick under an oven floor to be effective. IFB works ideally coupled with a layer of ceramic board.

davidwilcox123 03-15-2012 11:25 AM

Re: Hearth construction question
 
Les: loved your answer. Thanks.....

You're right. Needed some more information and an explanation. Thanks for the input. Simple step, now understood.

Less thermal mass!


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