Bricks, Masonry, Asphalt and Concrete - pouring concrete pad
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weinerman
04-13-03, 04:41 PM
Can you pour a 28x26 garage pad over an existing concrete driveway that is roughly half the size.The driveway is old but is not sinking and is in good condition.:D
pmgca
04-13-03, 06:54 PM
Hi,
Hi,
There is not real problem in pour concrete over concrete, but there are some important points:
- The new concrete will never "glue" with the old concrete or with the walls. So, you'll need to wire them with steel. If this conection is not OK, both layers and the walls will work as separate pieces, and the new one will surely crack.
-Be sure that the old floor is 100% clean before start (oil spots are the worst)
- You need to be sure that with the new floor thickness the garage door (or other doors) will open OK.
- Check drainages if necessary
Also check
http://forum.doityourself.com/showthread.php?s=&threadid=125306&
Hope this helps!!
Hi,
There is not real problem in pour concrete over concrete, but there are some important points:
- The new concrete will never "glue" with the old concrete or with the walls. So, you'll need to wire them with steel. If this conection is not OK, both layers and the walls will work as separate pieces, and the new one will surely crack.
-Be sure that the old floor is 100% clean before start (oil spots are the worst)
- You need to be sure that with the new floor thickness the garage door (or other doors) will open OK.
- Check drainages if necessary
Also check
http://forum.doityourself.com/showthread.php?s=&threadid=125306&
Hope this helps!!
weinerman
04-13-03, 08:31 PM
Thank you for the fast response.One question about the reinforcing to join the two pads.Should there be rebar fastened to the old concrete from the sides and from the top so the new concrete when poured can have something to hold to or should the two pads work independently of each other.I was told that a layer of either sand or heavy plastic should be laid between the new and the old. Thanx
pmgca
04-13-03, 09:03 PM
Hi,
I guess we need to consider two different things
- When you are going to pour two big different concrete pieces, or if they are going to be with continuous dynamic loading, or if there will be very high / low temperatures, is better to consider a joint, because this will give the two pads the necessary space to expand.
- When you are going to pour an addition, you need to connect the two pieces with the rebar because they must work together. The soil condition under the driveway probably is different from the soil condition under the pad, so if you don't "sew" both pieces, you will have cracks soon.
Regards,
I guess we need to consider two different things
- When you are going to pour two big different concrete pieces, or if they are going to be with continuous dynamic loading, or if there will be very high / low temperatures, is better to consider a joint, because this will give the two pads the necessary space to expand.
- When you are going to pour an addition, you need to connect the two pieces with the rebar because they must work together. The soil condition under the driveway probably is different from the soil condition under the pad, so if you don't "sew" both pieces, you will have cracks soon.
Regards,