From: Jim Kestner <jkestner(--nospam--at)somervilleinc.com>
Date: Tue, 21 Mar 2000 08:18:02 -0600
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
do not overly wet the subbase
I hope this helps!
Jim Kestner, P.E.
Green Bay, Wi.