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Old 09-10-2012, 09:44 AM
Join Date: Sep 2012
Location: Illinois
Posts: 12
Default Hardibacker

I am doing a pompeii oven construction and have a few questions. I have the perlite concrete pad poured and i have located the fire clay and refractory cement. My questions are these, can i use hardibacker on top of the perlite concrete to set my firebrick on? Also do i need to adhere the firebrick to whatever i use on top of the perlcrete?
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Old 09-10-2012, 11:11 AM
Join Date: Jul 2008
Location: USA
Posts: 153
Default Re: Hardibacker

Hello rmydler,

There is no need to use the hardibacker on top of the perlite concrete. The concrete slab will be sufficient. Also hardibacker is fire resistant not fire proof. I do not recommend you adhere the floor tiles to anything for reasons such as if one breaks you will not be able to get the broken piece out without breaking the rest of the tiles.

Happy Building,
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Old 09-10-2012, 04:54 PM
Join Date: Sep 2012
Location: Illinois
Posts: 12
Default Re: Hardibacker

Thanks for the reply, i was afraid to use it without asking someone for fear of it emitting something through the bricks when i go hot. I have posted the same question in another thread because after i posted this i could not find it.
thanks again
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Old 09-11-2012, 03:54 AM
Join Date: Mar 2011
Location: Bucks County, PA
Posts: 321
Default Re: Hardibacker

I agree with Amber....

Although concrete-based, HardiBacker is not designed for heat. Also I would not adhere the hearth-bricks to the slab....let them float. Take the time to pack them tight, level and flat...so that you have a nice flat work surface. You do not want any brick edges sticking up....(you will catch your pizza peel)

Good Luck!
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