How to Install an Undermount Sink in a Granite Countertop

An undermount sink installation is a fairly simple procedure. But if the installation has to be done under a granite countertop, it could be a little tricky. You might be able to execute the installation of the undermount sink on your own, but it is advisable to take help from a professional as far as cutting the granite is concerned.

Step 1: Cut the Hole

The very first step in installing an undermount sink on a granite countertop is to cut a hole in the granite. This will provide you with the space to insert the sink. It is advisable to get a professional to introduce the hole as it is not recommended to cut granite on your own.

Step 2: Measurement

While placing an undermount sink on a granite countertop, you have to pay attention to the measurements. If you get an undermount sink with wrong measurements it will be hard to work with, as the countertop is granite.

Step 3: Buying the Undermount Sink

At the hardware store pick the undermount sink according to the measurements. The stainless steel variety is always preferable as it is low maintenance.

Step 4: Place the 2x4

Now place a two by four across the granite countertop. In the next step, this will come handy to clamp the sink.

Step 5: Trial

Insert the undermount sink into the hole in the granite. The rim of the sink will be below the granite countertop. Clamp the sink and make necessary adjustments, to get the undermount sink to sit in the right position.

Step 6: Drill Holes

With the undermount sink in place mark the potions where the holes need to be drilled on the granite countertop. Take the sink out and use a drill to introduce holes in the marked spots.

Step 7: Clean

The ridge has to be cleaned with preferably denatured alcohol. Allow it to dry. This will prep the ridge for further activity.

Step 8: Silicone Sealant

Apply a thin layer of silicone sealant on the edge of the granite countertop, Place the sink in. Now clamp it into position.

Step 9: Wing Nuts

The next step is to insert the wing nuts into the available screws heads. Make sure the nuts are tight. If not, tighten it with your hand.

Step 10: Masking Tape

After the wing nuts are in place you will have to stick masking tape at the back of the counter top. Mark the position to make provision for the faucet.

Step 11: Fittings

Once the undermount sink has been fit in place you can go ahead and attach all the fitting. The faucet has to be introduced and the supply lines have to be connected.

Step 12: Test

The final step is to test if the installation has been carried out successfully. Turn on the water supply to the undermount sink. Check for any leaks. If there are no leaks, the installation is complete.