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NYC 07-11-2011 12:19 PM

Slab question...
I live in NY and wondering how deep of a foundation to pour for a Pompeii. I will be leaving my current oven alone and build the new one in another area. We generally pour a 6" slab for driveways to handle the weight of cars reinforced with steel mesh. How deep should I go for the oven footing?

Les 07-11-2011 01:05 PM

Re: Slab question...
Depends on the soil but a good rule of thumb is below the frost line.

EDIT... I should have said the footings should be below the frost line

NYC 07-11-2011 02:15 PM

Re: Slab question...
Our frostnline is 36" deep. I can see dropping a sonotube in the center but not anfull slab 3 feet thick. Any thoughts?

Les 07-11-2011 02:33 PM

Re: Slab question...
Correct - that's why I added the edit. A three foot slab would be insane.

NYC 07-11-2011 02:44 PM

Re: Slab question...
So then use a post digger on the corners and center down to 36" at about a 6" diameter and then pour it with a reinforced 6" slab for the foundation? What you think?

Les 07-11-2011 03:14 PM

Re: Slab question...
Sounds like it will work. I'd drop some steel in the holes as well. Do you know what type of soil you have?

NYC 07-11-2011 03:21 PM

Re: Slab question...
We have mostly clay here with maybe 12" of top soil on top.

Les 07-11-2011 03:42 PM

Re: Slab question...
Bummer - go deep.

Neil2 07-11-2011 03:54 PM

Re: Slab question...
Many have just used a floating 5-6 inch reinforced slab (rebar not WWF) regardless of the soil conditions.

Put a 3-4 inch layer of crushed ruck under the concrete slab and make sure this layer has positive drainage.

Frost heaving, if severe, may move your slab and oven around a bit, but if it is well reinforced it will take it OK.

To my knowledge, no one has on this site ever reported a failure in a properly reinforced slab due to frost action. (Underlined properly since a lot of the slabs I have seen here are clearly not done very well with respect to rebar placement.)

NYC 07-11-2011 05:17 PM

Re: Slab question...
After speaking to the mason who poured 3,000 sq ft for me last summer around the pool he said to go 30 inches down with 8" ID tubes in the 4 corners and center and then 8" reinforced slab on top of the stone base. I want to brick the cinder block base and top enclosure so it will bear alot of weight on this slab and also I do not want too much cracking in the mortar of the brick due to movement. Biggest hassle is getting this pour done fast enough with a mixer before it sets as I cannot fit a truck back there for delivery of ready to pour stuff like we did for the pool. That was before the brick wall and gate were built.

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