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RE: Separating slab on grade

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Concrete does almost all of its shrinkage within the first two years, most is actually within the first 90 days,  although if there is a covering, this somewhat depends on when the covering was applied.

If you wait until the concrete is a year old,  remove the cracked tile, and route and seal the underlying crack, you should probably not have that much more movement.  If the underlying cracks do not extend completely across the slab in both directions, you should continue a sawcut to the edges.  Essentially what you are doing is putting in a control joint where there should have been one in the first place.

Gail Kelley

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