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Originally Posted by michika
Okay cool.
So if I had say an 8" floor would I have to, or should I, reinforce it further? Or is this one of those things that I should wait and see what the floor is like?
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There's no need to reinforce it further unless it's falling apart. The concern for new houses is that the concrete still has to settle and cure possibly causing some cracking (if it wasn't poured properly) and movement. Hence the suggestion of using an isolation membrane if you plan on tiling. I would also suggest porcelain tile over ceramic or natural stone given its strength and resistance to cracking. If you use carpeting it not as big of a deal. Just make sure the floor's flat and true.
For older houses, the slab isn't as much of a concern since all the shifting and curing has already ceased and you can go about dealing with it "as is".