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  #1  
Old 12-01-2013, 08:39 AM
Serf
 
Join Date: Nov 2013
Location: cincinnati ohio
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Question hearth floor construction

I am building a 36" dome oven. The base is ~50"x70" for the hearth floor with 2" angle iron on 16" center. I intend to use 1/2" concrete board and then a mixture of portland cement, quickcrete concrete, vermiculite with rebar and make that layer ~2" and set my 24x12x3 firebrick slabs on that.

Question is do you think the mixture of concrete, cement and vermiculite is OK?
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Old 12-03-2013, 03:11 PM
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Default Re: hearth floor construction

Welcome to the forum.

In my mind, you need a structural base (my hearth base was 3.5 inches thick with angle iron and rebar), then an insulating layer (I used a two inch insulating board), then the oven floor (2.5 inch firebrick). I recommend you download and read the pompeii oven plans, they lay out the process for a strong base/hearth structure and a proven oven. Quickcrete will suffice for the hearth, but I would not mix the vermiculite in the structural base. Cast the vermicrete layer over the structural base/hearth. HTH
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Old 12-09-2013, 07:58 AM
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Default Re: hearth floor construction

I agree with Lee. What you describe will not insulate well and you will likely have difficulty getting the floor temperature up to where you want it. I used 3 inches of insulating board over a concrete base and I am very happy with the results!
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Old 12-09-2013, 09:26 AM
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Default Re: hearth floor construction

Quote:
Originally Posted by avkroth View Post
.....and then a mixture of portland cement, quickcrete concrete.............
There is no need to add Portland cement to a bagged concrete product.
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Old 12-09-2013, 11:00 AM
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Default Re: hearth floor construction

That depends Stonecutter. A lot of what is sold in big box stores is only rated at 2500 PSI, with actual breaks well below that. If it is their lowest cost product, a shovel per 80# bag is a good thing.
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Old 12-09-2013, 11:42 AM
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Default Re: hearth floor construction

Yeah, I agree, but for an oven slab its overkill.
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Old 12-09-2013, 01:00 PM
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Default Re: hearth floor construction

For the slab, yeah, but I thought he was talking about the hearth.
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Old 12-09-2013, 03:35 PM
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Default Re: hearth floor construction

Yes that's right, but I saw he is installing angle at 16" oc for the hearth slab. So 2500 is plenty strong with that kind of support. It's possible that his bag mix is the 5000 psi stuff....and more porty is way overkill that too.
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Old 12-09-2013, 03:46 PM
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Default Re: hearth floor construction

I should just say I agree that a shovel of porty is good insurance for a #80 bag...and cheap. It is possible to add too much Portland in a mix design, but I think I am over thinking this.
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Old 12-09-2013, 05:39 PM
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Default Re: hearth floor construction

just gotta ask....to clear my own mind...what happens if there is too much portland in a mix?
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