Is your sink sitting on a plywood or some other substrate too? Or is it just the silicone holding up your sink? We're in a rental house right now (our house is being remodeled) and an undermounted bathroom sink just popped off of the granite--it was only held on with an adhesive. A kitchen sink, full of dishes will bear a lot more weight than a little porcelain bathroom sink, so check to make sure that silicone adhesive is not the only thing holding up your sink!(the undermount kitchen sink in the house is on a wooden base) Best of luck . . .

Sylvia, my installers used color matched caulk at counter and window, at counter and splash, and all around at inner edge of SS sink and counter top.

My Caesarstone in kitchen is Carmel (a mottled dark tan). Their caulk color matches very well.

Yours is not looking like you think it should? Is the clear caulk shiny or something? Send me an email and I'll show you what mine looks like. W.Rush@sbcglobal.net

Good your sink won't fall down because it's hanging on plywood, right?

Silvia 2007-

I teach Fabricators at AZ School of Rock that
Silicone ONLY should NEVER be used to hold a sink up
IN ANY CIRCUMSTANCE.... IMHO - Just NOT a good method.

If I am understanding your question correctly, the
silicone caulk ONLY is being used to secure your sink in
place with NO other means of support? IF this is the
case, you WILL have problems "down the road" maybe not
today or tomorrow, but sometime in the future - prolly
within the next 4 years.

As others have mentioned on this thread, a BETTER way of
engineering your support for the sink, is to include some
means of mechanical support - along with the silicone.

Don't get me wrong - we use silicone every day at our Fabrication
shop AND at AZ School of Rock to create a water seal in
ALL of the sinks we install that are undermount. We just
DON'T rely on the silicone alone to hold the sink up.

In the 22 (going on 23) years that I have been doing slab
work, I have seen many other people's failures because they
relied solely on the silicone to hold the sink up...

There's many types of support systems that are available -
clips, "under-counter-mounters", plywood, etc. It just makes
better sense to me that some kind of "cradle" effect relieves
the pressure of the sink pulling down on the stone top.

Just my .02 cents worth, but in almost 23 tears of doing
undermount sinks WITH supports, I have not had ONE callback!

(and Callback's AINT always GREENBACK'S)

Hope that helps

kevin

Kevin M. Padden MIA SFA
Fabricator, Trainer & Consultant to the Natural Stone Industry
www.azschoolofrock.com

Here is a link that might be useful: AZ School of Rock

Kevin,
My install is one year old and the sink is pulling away from the countertop, (just a little). My bathroom fabricator, (not the same guy as the kitchen), purchased Chemical concepts by Braxton Bragg glue on clips. You peel and stick them on. They are not the best solution but the sink is already installed so they will at least help.
Donna

Donna-

Braxton Bragg is an "Industry Partner" of AZ School of Rock,
and we use the Chemiacl Concepts clips in many applications.

The CC clips are relatively new to the market (less than
10 years in service - I think) but they are GREAT for
the application you have. If I were in your shoes, my
comfort level with the integritty of the sink install
would have just shot up 1000% !!!

Good for you and Good for your Contractor - he did the right
thing!

You're in really good shape now!!!

kevin

Kevin M. Padden MIA SFA
Fabricator, Trainer & Consultant to the Natural Stone Industry
www.azschoolofrock.com

Here is a link that might be useful: AZ School of Rock

Sylvia's sink is "sandwiched" BETWEEN plywood subdeck and stone.

I'm a little amused by the responses of falling/failing sink support that doesn't apply. I believe the concern is HOW the clear caulk LOOKS to her.

I've done undermounts for 30+ years and they have always been between plywood and the countertop