Old 06-26-2010, 09:57 AM
Join Date: Jun 2010
Location: Cardiff
Posts: 1
Default Laying half fire bricks onto reinforced concrete base

I am building my own external wood oven.

I have built the base and have a 5 inch reinforced concrete base. I have purchased some half fire bricks for the base/hearth (230 x 114 x 32mm). So with the refractory cement layer there will be a heatproof thickness of about 40mm between the burning wood and the concrete base.

Question I have is, is this enough to protect the ordinary concrete base from fracturing/cracking with the heat?

All opinions & advise greatly welcomed


PS. Hello everyone
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Old 06-30-2010, 08:11 AM
Join Date: Aug 2009
Location: Columbus OH
Posts: 95
Default Re: Laying half fire bricks onto reinforced concrete base

If I understand this correctly, you have no insulation layer on the top of your concrete base?

I dont think you should worry about protecting the ordinary concrete. The main issue is that you will lose so much heat with no insulation.
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Old 06-30-2010, 11:03 AM
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Il Pizzaiolo
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Laying half fire bricks onto reinforced concrete base

If you take portland cement based concrete up through about 550 F, it will deteriorate.
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