I had my kitchen remodled 9 months age. I had granit countertop installed with a stainless steel 9" deep undermount sink. Three months ago the sink fell off the granit. The remodling company had the sink reglued. Instead of waiting 24 hrs for the glue to cure, we did not use the sink for 3 days. We braced the outside edges of the sink. We have been very careful not to put heavy pot and pans in the sink. Now the sink has agin come loose from the granit in the top and bottom middle section. Will we always have problems with this? Is the instillation bad? Should undermount 9" deep sinks not be used with granit? How can we fix this problem? Will I just have to buy another overmount sink? HELP!!

The sink was likely improperly installed the first time. Typically mounting brackets are epoxied to the underside of the stone and a bead of silicone applied to the sink rim as a water seal. The installer has to make sure that the surface is clean, dry, and dust-free or the epoxy can fail, and I have heard of cases where the epoxy failed not matter how well prepared.

A more foolproof solution is to frame up an under the counter mechanical mount to support the sink. Make sure, first, though, that the installer didn't just use silicone to attach the brackets. That is a fairly common mistake/shortcut by inexperienced installers. A good cabinet guy can help you a lot.

You might receive more input if you repost your question in a different message board, perhaps Interior Finishes or Remodeling.

Good luck!

what has occured is that the orgional adhesive that was used to hold sink into place was not removed properly from the granite for the 2nd re-glue. What the contractors should have done regardless of the sink gluing is to install supports to hold the sink into place and not rely on the glue alone. You need to sand off the glue on the top, clean it well and clean and lightly sand the surface of the sink. As I assume this is where the failure is taking place. Then once the glue is applied and the sink set into place. Install wood supports that are glued to the inside of the cabinet to aid in this support. In addition there are small plugs that can be drilled and glued into the granite surface from underneath. These brass plugs are threaded and are held into place using an apoxy glue. Once dry machine screws can be used to hold sink in place. This should have been done in the first place as most undermount sinks (stainless) come with them.