#11  
Old 03-03-2010, 08:27 PM
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Default Re: Slab thickness

"Just for the record, a twelve inch thick footing on undisturbed soil, below the frost line, protruding six inches beyond the perimeter of the structure, is code for masonry fireplaces."

Yes. That is generally a smaller footprint and supporting the twenty foot masonry chimney.
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  #12  
Old 03-03-2010, 08:29 PM
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Default Re: Slab thickness

"Don't do a bit of both."

Or.

Don't build a slab at all !
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  #13  
Old 03-03-2010, 08:55 PM
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Default Re: Slab thickness

When my footing slab was done....it was about 15 cm (5 inches) thick with re-enforcing bar through the cement. I think this was needed as the size of my workbench and weigh of the WFO was about the 700 kgs mark. The workbench/support slab that was made is alittle different. The slab is around the 12 - 13 inches thick mark (yes, very thick!!!) with enough reo bar in it the build a house on. But the brickie who helped me did his calcuations wrong and made the concrete double strength!!! But it has worked out good as it is a free standing slab and I know there is no way its going anywhere!!!

Scott
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  #14  
Old 03-08-2010, 06:19 PM
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Default Re: Slab thickness

PlanoPhil,

I'm down the road from you here in Austin. I put in a 6 inch slab with rebar and some used wire shelving for reinforcement and it has worked fine so far. From all that I read on the Portland Cement Association website one key to concrete strength was in the curing. I poured, kept it damp for 3-4 four days and then let it cure for 4 weeks before building.
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  #15  
Old 03-09-2010, 06:49 PM
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Default Re: Slab thickness

If you have reasonable soil conditions, you don't need footings or piers.

Many ovens are built on slabs alone.
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  #16  
Old 03-09-2010, 07:34 PM
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Default Re: Slab thickness

Yep, a freestanding oven on a slab on well drained crushed rock is pretty much standard.
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  #17  
Old 03-10-2010, 06:45 PM
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Default Re: Slab thickness

Our caliche clay (aka black gumbo) is anything but standard. The foundation repair companies do quite well here going back and putting in piers for all those slabs that should have been good enough.... With that said it does not need to meet the standards of a full masonry fireplace with a 25 foot brick chimney.
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  #18  
Old 03-11-2010, 08:14 AM
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Default Re: Slab thickness

Quote:
Originally Posted by PlanoPhil View Post
I spoke with a vendor at the Arlington Texas Garden Show today about building a WFO who claimed to be a master mason and he told me that I should make my foundation slab atleast 12 inches thick. Is he all wet or just trying to discourage me from building my own WFO? He was trying to sell me a $3500 prefab oven that he claimed I would be making pizza in 2/3 hours after he started the build.

Phil
This wasn't the same guy that had the $10k oven that he would basically bring in on the back of a truck and have a forklift put on your slab?
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  #19  
Old 03-12-2010, 03:21 PM
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Default Re: Slab thickness

"Our caliche clay (aka black gumbo)"

A slab alone will work fine. The slab should be well reinforced. The worst that can happen is settlement which, if even, is no problem. Even if it is uneven it is not a problem unless your oven tilts so much that pizza slides out.
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  #20  
Old 03-12-2010, 09:27 PM
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Default Re: Slab thickness

If your pizza sauce and toppings start to shift/settle to one side of your pizza then that is really one uneven oven hehehehe

Last edited by Raffy; 03-12-2010 at 09:30 PM.
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