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Pouring Concrete Over Concret? Alan 01-21-2007
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Posted by jtees4 on January 22, 2007, 1:37 pm



>Hi,
>
>I have a old horse barn that has a floor that is part dirt (where the
>stables used to be) and part concrete. The problem it is not half and
>half, it is mixed and in places the concrete is cracked and broken.
>
>I want a full slab in the barn to turn it into a shop. However, I
>don't want to go through the problem and costs of digging up all the
>existing concrete before I pour new. I am also wanting to put in
>radiant floor heating.
>
>So is there any process that works for pouring new concrete over old
>concrete and having it still adher and be able to take weight of things
>like tools or even a car?
>
>Thanks.
>
>Alan

4" new concrete imbedded with 6x6-10-10 welded wire mesh. Concrete
should be 3,500 or 4,000PSI.

AppliancePartsPros.com, Inc.
Posted by Mike Ryan on January 23, 2007, 12:25 pm



>Hi,
>
>I have a old horse barn that has a floor that is part dirt (where the
>stables used to be) and part concrete. The problem it is not half and
>half, it is mixed and in places the concrete is cracked and broken.
>
>I want a full slab in the barn to turn it into a shop. However, I
>don't want to go through the problem and costs of digging up all the
>existing concrete before I pour new. I am also wanting to put in
>radiant floor heating.
>
>So is there any process that works for pouring new concrete over old
>concrete and having it still adher and be able to take weight of things
>like tools or even a car?
>
>Thanks.
>
>Alan

I would think that if you poured a full thickness 4 inch (or thicker)
slab over the whole thing, it should not matter what is under it, as
long as the old concrete is relatively solid. The problem is whether
the different sections of concrete will allow for getting the whole
floor level. If one section is 6 inches higher than the other, you
may have problems. But if they are all about the same, just pour over
all of it. That old concrete will just add to the strength of the
floor, and you dont really need to adhere the new concrete to it, if
you do a full thickness pour.

I'm no concrete expert, but I have poured some walks and a few garage
and shed floors over the years., and I actually did pour one shed
floor over and an existing shed slab, which was a smaller shed, so the
old floor is only under part of the new one. In the new section I
added some broken chunks of concrete under the new floor so I could
get rid of them. The floor is solid and I never had any problems with
it. I do not drive on it though, it's just a work shed and woodshed
combo.

Posted by hallerb@aol.com on January 23, 2007, 2:23 pm


>
> I would think that if you poured a full thickness 4 inch (or thicker)
> slab over the whole thing, it should not matter what is under it, as
> long as the old concrete is relatively solid. The problem is whether
> the different sections of concrete will allow for getting the whole
> floor level. If one section is 6 inches higher than the other, you
> may have problems. But if they are all about the same, just pour over
> all of it. That old concrete will just add to the strength of the
> floor, and you dont really need to adhere the new concrete to it, if
> you do a full thickness pour.

some areas will sink under the weight of a vehicle and the entire thing
will crack, espical;ly where existing concrete is


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