Pouring a new concrete slab on an existing slab
(Hollywood Park TX)
Q. We have a concrete patio that is part of the house slab, I want to bring it up to the level of the existing slab about 3 1/2" to 4", is it possible to pour a slab that thick on top of another slab and have it hold up in the long run?
A. Yes, we do it all the time. As long as the slab your pouring over is sound, you will be fine.
We install a bond breaker like typar between the two slabs to keep them from bonding to each other. Allowing the two slabs to move independently from each other will help minimize random cracking in the new slab.
If there are any saw joints in the existing slab, saw new joints directly above them in the new slab.
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