Old 09-30-2011, 02:41 PM
bobmurphy's Avatar
Join Date: Aug 2011
Location: missouri ozarks
Posts: 78
Default Insulating firebrick

I am planning on building a oven in the future. Being the cheap scrounger that I am, I have been on the lookout for the materials that I will need. I have found a source for used light weight insulating firebrick. Would these be a good to use for the insulating layer under the hearth, instead of the vermiculite cement mix. I can get them for about 75 cents each. Has any one used these for this application?
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Old 10-03-2011, 10:25 AM
GianniFocaccia's Avatar
Il Pizzaiolo
Join Date: Jun 2009
Location: Disneyland, CA
Posts: 1,632
Default Re: Insulating firebrick


Insulating firebrick (IFB) are fine for underhearth applications and yes, several builders have used them. They have approximately the same R factor as vermicrete. As such, you would be better off to stand them on their sides to give 4 1/2" of insulation instead of 2 1/2". They would also work well under a layer of insulating board.
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Old 10-03-2011, 12:14 PM
bobmurphy's Avatar
Join Date: Aug 2011
Location: missouri ozarks
Posts: 78
Default Re: Insulating firebrick

Thank you for your reply. I was not finding any info on the insulating bricks. I guess I will score some of these. I think they would be easy to work with
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