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Re: Slab Curl

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Slab curl is normally caused by a differential of moisture content
between the top and bottom surface of the slab. Similar to a wet paper
drying on a desktop where the top surface drys quicker then the
bottom........the edges curl up. A vapor barrier on the bottom of the
slab will accentuate this problem.

Solutions to minimize curling in future slabs are:

3 " of stone shavings over the vapor barrier

closer spacing of control joints

larger aggregate in slab

good curing

do not overly wet the subbase

thicker slab

I hope this helps!

Jim Kestner, P.E.
Green Bay, Wi.