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Old 04-22-2013, 09:55 PM   #16
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New Patio - Pour over existing or demo?


Quote:
Originally Posted by itsreallyconc View Post
you don't place any bonded overlays, joe ? not just poly-mod'd thin but 4" or 6", either ? ? ? that 4" separation - lateral OR vertical ? ? ? tnx, j
Very rarely will I pour over a garbage floor/slab w/o tearing it out first. Subgrade is critical here in our freeze/thaw region. If the first slab failed, the second likely will as well if the subgrade isn't adequate.

As for the 4", I was talking about a 4" buffer vertically, which there obviously isn't room for most of the time, so we generally tear it out.......

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