Granite bathroom countertops are gaining popularity. They can be installed on any vanity and can help to bring natural beauty to the bathroom. One of the benefits of a stone vanity top, such as granite, is the ability to use an undermount sink. Undermount sinks not only give the vanity a more streamlined appearance, they can also help to keep the counter clean, by giving you the option of pushing debris from the counter into the sink. To install a granite counter on your vanity, install the sink first.
- Skill level:
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Things you need
- Measuring tape
- Band saw
- Hex key
- Sink mounting hardware
- Silicone caulk
- Stud finder (optional)
Measure the area where the vanity will be installed and find the centre line for the drain. The drain should be located in the centre or middle of the vanity, so once you measure out the area, divide this measurement in two and mark the exact centre of the wall. This will allow you to position the vanity properly.
Keep in mind that the granite countertop will overhang the vanity by 1/2 inch on each side. If your installing your vanity next to a wall and it has a filler strip, or thin piece of wood to fill the gap between the vanity and the wall, you can cut the filler strip with a band saw to fill in the area beneath the overhang.
Position the vanity on the wall. Make sure that the back is accessible for the waste pipe and water supplies. If necessary, use a hand-held jigsaw to cut out holes for the plumbing. Position the jigsaw against the wood on the level with the water supplies and waste pipe. Push the saw in a circle large enough for these pieces to fit through. Don't worry about making the circles the same size, as the plumbing will cover them.
Flip the granite countertop upside down and install the faucet. Use a hex key to take off the top of the faucet, and then push the faucet stems through the holes. Replace the faucet tops and tighten them down with the hex key.
Run a bead of silicone caulk around the opening for the sink cutout. The silicone caulk is available in a squeezable tube; just run a thin line of it around the opening so that the sink's rim can sink into it. Don't squeeze too much in any one area as the pressure from the sink will flatten it out. Center the sink over the opening and press it into the caulk. Install the sink's mounting hardware by applying a bead of epoxy next to the sink's rim on the underside of the granite and pressing the bolt stem into the epoxy.
Install the mounting clip on the sink's rim, next to the bolt stem, securing it with epoxy. Wait ten minutes for the epoxy to set and then attach the clip and bolt stem by screwing the bolt down with a wrench. Do not over-tighten the bolt, or this may crack the granite.
Test the fit of the granite top over the vanity. Lift the top onto the vanity and make sure that it overhangs evenly on each side, and that the vanity doesn't need to be moved farther away from the wall to create a balanced installation. There should be a 1/2-inch overhang of granite to each side, and a 1-inch overhang in the back. Move the vanity along the wall as needed to fit.
Use a power drill to screw the vanity at its back to a stud in the wall to hold it in place. If necessary, use a stud finder to locate the stud, moving the device along the wall until it indicates that it has detected a stud.
Squeeze a line of silicone caulk around the edge of the vanity. Make sure the line of caulk is even, with no breaks; the granite will flatten it out once it is in place so there is no need to cover the entire rim. Lift the granite top into place and allow it to settle into the caulk. Allow the silicone to set up to 24 hours before installing the sink drain and hooking up the faucet to the water supplies.
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