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Tomm 06-15-2011 03:05 AM

think i made a boo boo
i think i made a big mistake i poured my slab without insulation hoping ther is a remedy to this problem without major renovation

Faith In Virginia 06-15-2011 03:14 AM

Re: think i made a boo boo
I think your fine. Insulation goes on top of your slab. Are you using insulation board or a vermiculite/Portland for your insulation?

Tomm 06-15-2011 03:37 AM

Re: think i made a boo boo
not sure can i use 2 inch foam board

Faith In Virginia 06-15-2011 05:27 AM

Re: think i made a boo boo
Why? Also who's plans are you using? And what type of oven?

Tman1 06-15-2011 06:04 AM

Re: think i made a boo boo
Typically when you say slab you referring to the bottom-most portion.... do you mean hearth? Perhaps some pics to help understand the problem.
Did you start the dome already and that's why you don't think you can? Too many variables, not enough info.

Killian 06-15-2011 10:58 AM

Re: think i made a boo boo
Foam board is no good (it will melt), but the fancy iso board sold by fornobravo is great. What I did was pour 3" of concrete followed by 3" of vermiculite concrete. You can do this as an overpour on your existing slab- it's not as good an insulator as the hi tech stuff but it's way cheaper. It's also soft and crumbly, so don't leave any exposed in the finished structure! It is strong/dense enough to support the hearth, I just wouldn't leave any exposed to the elements.

Tomm 06-15-2011 05:51 PM

Re: think i made a boo boo
thanks for info sorry i wasnt more specific when i first posted building 36 inch dome i ended up putting 3/8 hi denesity insulation with 1/2 inch cement board on top and then laid the hearth in fire clay high heat refactory mortor hope this works because i laid my first course and two rows above on my way im sure ill be back for help again talk to ya soon

Les 06-15-2011 07:42 PM

Re: think i made a boo boo

Originally Posted by Tomm (Post 115072)
3/8 hi denesity insulation with 1/2 inch cement board

I think you need 2 inches minimum. And whats up with putting durock on top of the insulation? Are you building to a set of plans? It's not too late to get on track.

RTflorida 06-15-2011 08:17 PM

Re: think i made a boo boo
STOP what you are doing.

3/8" high density insulation? First and foremost, 3/8" is just about worthless, not quite, but just about. Second, you say high density, don't all manufacturers call all of the different types of insulation "high density"? What is the composition? You need a REFRACTORY product such as ceramic fiber board (minimum of 2 ") or vermiculite concrete or perlite concrete (minimum of 4" of either of these). Most of the products calling themselves "high density" are either styrofoam or fiberglass based and are not rated for temps anywhere near those achieved in our ovens.
As for the cement board on top...????????????

Please, go to the Forno Bravo store and purchase (FREE!!!) the Pompeii oven plans, they will set you straight and get you to building an oven that will actually perform, not just lead to massive deforestation due to the huge amounts of wood you will be burning trying to achieve and maintain pizza temps.
I would also recommend spending AT LEAST a few hours checking out the many incredible oven builds on this forum. A lot of members have gone to great lengths to document their builds for others to learn from and drool over.

Good luck and keep us posted


Tomm 06-16-2011 04:44 AM

Re: think i made a boo boo
insulation has foil face and r- value of 11 just as much as 2 inch

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