We recently had a new house built including granite countertops. The island countertop has cracked twice now. They are not finished repairing the first crack and it cracked in a different spot last night. We noticed that the granite had a bow in it (low in the middle and high on either end of the island with a few loose shims). It has sheet of plywood glued to the back of the slab. I am sure that we heard the first crack when it happened at night and noticed it the next morning.
What has been the experience of other people with a similar situation?
In addition to the question above here are three pics of our new countertop that is cracking (3 months old).
Sorry to hear about your new counters. If the counter is properly supported with a plywood sub-top this should not happen. That counter should be 100% level. If any shims were needed to level it, they should have been put on the floor under the cabinetry. Shimming under the counter would create the bow. If the cabinets are installed level, the next step is to screw done a plywood sub top. Next is to use an ashesive and lay the granite. No warping should occur after this. I would be asking for a complete new island top.
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