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Old 07-09-2012, 09:39 AM   #16
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What is the minimum depth you can pour a basement floor?


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Originally Posted by dalepres View Post
I think you can land commercial aircraft on 12" thick steel reinforced concrete. I think if you got to 6 inches you could put any heavy load likely to be found in a residential basement.
12" haunches with reinforcing are for load bearing applications, and yes that thickness does exist in alot of residential basements. For example, A typical lally column footing is 12" thick...

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Old 07-09-2012, 10:46 AM   #17
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What is the minimum depth you can pour a basement floor?


There would be no reason to install a 12" concrete slab in a residential application if its non-structural. I would dowel it into the adjacent concrete at some interval to prevent settling/heaving.

Concrete is horrible in tension, and a slab is almost wholly in tension. At least install welded wire fabric, or expect cracking as the reinforcing wire helps to support the concrete should the base settle or excess loads placed on the slab.

Without knowing exactly what you are doing, and seeing the existing construction, I refrain from giving direction to remove the slab or portions of the foundation, but my suggestions above are only in regard to preserving the integrity of the new slab.
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Old 07-15-2012, 10:21 PM   #18
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What is the minimum depth you can pour a basement floor?


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Originally Posted by AGWhitehouse View Post
12" haunches with reinforcing are for load bearing applications, and yes that thickness does exist in alot of residential basements. For example, A typical lally column footing is 12" thick...
That's a footing, not a floor.
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Old 07-16-2012, 09:21 AM   #19
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What is the minimum depth you can pour a basement floor?


Please read thoroughly...I know 12" is a footing, been saying that all along...I have no idea what the OP is trenching through in his basement, so I'm trying to broadcast info. But I guess it created more confusion than clarity, so I'll spell it out:

Basement Slabs:
--3" min. thickness for "rat" slabs, 3,500 psi. (can be made 2" for crawl space type applications, but 3" is recommended)
--4" min. thickness for typical slabs, 3,500psi min.
--5-6" min. thickness with 6x6 wwf, 3,500psi min. for slabs to receive heavy items (a.k.a. cars, tractors, etc.)
--12" min. thickness with rebar, 3,500psi min. for load bearing wall slab haunches and lalley column footings.

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