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Posted by Alan on January 21, 2007, 9:36 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
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Posted by MB on January 21, 2007, 10:07 pm
Use some sort of latex adhesive as a bonding agent on top of the old
slab and let sit for an hour or so before pouring the new slab.
Alan wrote:
> 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
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Posted by Edwin Pawlowski on January 21, 2007, 10:09 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.
>
If it is cracked and broken, good chance the slab on top will crack and
break in the same place for the same reason. Find and fix the problem
first.
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Posted by Mike Ryan on January 21, 2007, 10:47 pm
wrote:
>
>> 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.
>>
>
>If it is cracked and broken, good chance the slab on top will crack and
>break in the same place for the same reason. Find and fix the problem
>first.
>
This is somewhat true, but some old concrete was poured way to thin.
My old garage floor was apparently poured by someone that did not know
how to use a shovel and rake. In some places it was 10 inches thick,
in others it was only an inch. Of course the one inch parts were
cracked. I no longer live there, but we poured a 4" slab right over
it, and it held up fine for the 6 or 7 years we lived there.
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Posted by Mike Ryan on January 21, 2007, 10:40 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.
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