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thebadger 09-26-2007 05:41 AM

Foundation Thickness

Planning the build for next year but trying to get all the details worked out...

"The Pompeii plans call for a minimum 5 1/2 -6 inch slab if I recall correctly"

We had a 15x15 patio poured (I guess the standard 3 1/2 thickness) in one corner I had the contractor make it thicker for the pizza oven (I wasn't home at the time to supervise but trust he did what he told me - at least a 6 inch deep 6x6 area. Since the grounds slops he indicated it is probably thicker - maybe up to 8 inches and my wife told me it looked like he inserted rebar.

Any concerns/issues/anything I can do before I lay my cinder blocks?

I don't think I'm going to cover the whole thing in a heavy stone, probably stucco and tile (possibly a stone veneer around the cinder block base).


asudavew 09-26-2007 09:10 AM

Re: Foundation Thickness
I think it will be just fine.

Unofornaio 09-26-2007 09:27 AM

Re: Foundation Thickness

Originally Posted by thebadger (Post 15881)
(I wasn't home at the time to supervise but trust he did what he told me

Why the $#@ cant I ever get customers like that??

As to the question, corners of patio slabs are usually the weakest simply by physics. If this area was thickened by the contractor you should be able to dig out the dirt on the side and see PROOF. Otherwise call your bookie because you might as well place a bet on if it will be ok or not. 4" on a corner is very risky..

If it is not thickened you can always pour a nice footing in that corner doweled into the slab and build on this.

Les 09-26-2007 09:37 AM

Re: Foundation Thickness
To add to this - I noticed you are in Ohio. Are you going to be affected by soil heave? I don't think you will have a problem in regard to the weight you are putting on it.


asudavew 09-26-2007 09:43 AM

Re: Foundation Thickness

Originally Posted by Unofornaio (Post 15899)
Why the $#@ cant I ever get customers like that??

I know what you mean Les.

I used to do kitchen remodels. Counter tops, cabinets, etc. etc.

I once did a job where the customer was an older man, in his 70's I'd guess.

Well when we got there he was sitting in the living room watching TV resting in a rocking chair.

As soon as we started to work, he moved that rocking chair into the kitchen, and watched the whole time!

Talk about nerve racking.......

RTflorida 09-26-2007 01:23 PM

Re: Foundation Thickness
I lived in northeast Ohio for my first 35 yrs, the frostline was considered the 3' (36 inches). Any footings, slabs, fence post, etc needed to be set to this depth to avoid soil heave. Not sure about the southwest (Cincinnati) area.

thebadger 09-26-2007 02:00 PM

Re: Foundation Thickness
Not sure aboit soil heave - sorry.

I'm pretty sure it is at least 6 inches in that corner and possibly eight. I will dig a little to make sure.

This 15x15 slab was built on top of where are old deck was. I think there are 4 concrete posts buried in the ground where the old deck beams rested on. I'm pretty sure he left those in. Not sure where they are in relation to the oven location.

Someone mentioned adding a slab on top. Would this work/offer the protection I need?

Other options?


Les 09-26-2007 07:07 PM

Re: Foundation Thickness

Heave can be a nasty thing - you can contact the city and they will tell you what depth your foundation should be. But your soil is the key. I live in an environment where it can get pretty cold. My lot is sitting on DG, not a problem. I have friends a few miles away and they are on clay - big problem. Adding a layer on top will not solve the issue - you need to go down. As I mentioned before, 4 inches will support a butt load of weight - it's movement you need to be concerned about.


RTflorida 09-26-2007 07:45 PM

Re: Foundation Thickness
Les, your right. I should have carried my thought a bit further.
To put it simply - movement of merely 1/4" - 1/2" could do serious damage to a Pompeii or cast refractory oven. I think most everyone has seen where a stone or brick fireplace have settled (or the surrounding structure) and the cracked mortar and bricks associated with the settling.
In the case of an oven we are talking about a self supporting dome; it's structural integrity would certainly be compromised by settling, upward, or lateral movement.


Les 09-26-2007 07:51 PM

Re: Foundation Thickness

I forgot to add something in my post - great choice in moving to Florida! :)

I went deer hunting in Ohio a few years back... Friggen COLD!!


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