I want to install a Granite composite sink under granite. I can't find any instructions on how to do it. It's thicker then stainless steel so you cant route out the plywood under the granite. The only instructions I can find are for installing under a formica counter top. The instructions say to see your fabricator. Any Help Please.

 

imintrouble,

Undermount sinks, stainless steel or solid surface sinks are best installed to the granite counter before the granite is installed. First, lay the granite piece in place and make sure it fits correctly and that the sink has all necessary clearances to fit. You may have to cut some wood of the cabinets away for sufficient clearance. Check also at this time for clearances for faucets and other plumbing. Again, you may have to trim some wood.

Make sure the granite has been at room temperature for at least 4 hours and is dry. If not, the sealant may not adhere properly. Lay the granite piece upside down on the floor. Clean the area of contact thoroughly with alcohol and allow to dry thoroughly. (at least 2 hours).

Attach the sink with ample silicone. Heavier sinks (enameled cast iron) should have small holes drilled (diamond drill in impact drill) on a FULLY supported granite piece to a depth of about ½". Fill with a lead shield and screw sink tabs into shields. Use the silicone sealant and the tabs. Allow silicone to fully cure (usually about 24 hours)
The problem is if this is countertop that is already installed. You may have to use plywood or wood bracing to assist in holding the sink in place until the above procedure is set for at least 24 hours.
Best advice is to hire a professional to install it.

Hope this helps!

 

Doug has a good way of doing it. Ours is a little different. If you're still not sure send me a message I give you my steps. Good luck, Tim (watkinsfl)

 

I don't mean to hijack this thread, but it is related.

I recently had my kitchen redone. After the install, I noticed that there were/still are small chips in the granite.

To the point, my sink is an undermount one and I just noticed a small chip around the edge of the sink.

Is granite brittle that a pot may chip it? Or do I chaulk up another one to the installers?

If it is relatively brittle and I have to worry about it or baby it, can I change sinks to a top mount, thereby eliminating the worry involved?

I thought this stuff was HARDER....

CRAP OUT OF LUCK......

 

A friend is having a sink installed on/in granite while re-doing their kitchen. Is it best to install as undermount or set in?

 

Recently, my contractor installed an undermount sink with a granite coutertop. I am not an expert in the installation, but it looks weird. The reason being, the granite cut-out is not wide enough to go over the sink rims. Thus an overhang of the granite countertop of about 1/2 an inch over the stainless steel sink. My contractor is saying that's the way he does it, so that people don't see the caulking that is applied between the sink and granite. When I visit brand names websites such as Kohler, I see that the cut-out is just wide enough, so that you see the sink rims. Is that the right way to do it? Also, I see caulk sticking out between the sink and granite countertop. My contractor is saying that spray LYSOL everyday to remove the MOLD and FUNGUS from the caulking.

Overall, I am thoroughly confused and would appreciate any pictures or feedback from experienced people like you, who can guide me to deal with this contractor.

Thanks,

Ajay

 

Hi Folks,
My undermounted Sink just detached itself and fell down, nothing broken, But need help putting it back, Any mounting instructions will be apreciated,
Asuming I will be able to get most of the stuff I need from Home depot.

 

azzkikr,

See post #2 in this thread.

Good Luck!

 

Hi,

We just had new granite countertops installed with a large, stainless steel, double-bowl sink. Installers also installed the sink. It is attached with silicone along with 5 clips screwed into the underside of the granite.

The sink manufacturer installation instructions recommend 16(!) clips.

Do I need to add additional bracing to support the sink or does the silicone adhesive make up for the lack of additional clips?

Thanks