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Industry standard discrepancy is a quarter inch in ten feet. Flatter is better of course but click together is pretty forgiving. High spots are more problematic than low spots. A poured slab is generally not as consistently flat as a suspended wood sub floor. It all depends on how well they troweled it. A quick flash of Feather Finish patching concrete on low spots is easy. Don't use a gypsum based floor stoneing, always a Portland based on a slab.
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