Step 1
Check the vanity with a level to ensure it is level. Place the level across the top of the vanity. Add shims between the bottom of the vanity and the floor where necessary until the vanity is level. It might be necessary to loosen the fastening screws securing the vanity to the wall when inserting shims.
Step 2
Attach the faucet fixture and the sink drain according to the manufacturer's instructions that come with the fixtures. Installing the fixtures on the porcelain vanity top before fastening it allows more room for tightening the various securing nuts.
Step 3
Set the porcelain vanity top on top of the vanity, with the assistance of your helper. The vanity top should be level and fit securely over the vanity. This step also helps you see how the vanity fits in relation to the corners of the wall.
Step 4
Lift the vanity top off the vanity and set it aside. Apply a half-inch bead of silicone caulk along the top of the vanity framing with a caulking gun.
Step 5
Pick up the vanity top with the assistance of your helper. Carefully place the vanity top over the top of the vanity. Press the vanity top down so that it makes contact with the silicone caulk. Connect the remaining plumbing according to the manufacturer's instructions. Apply a bead of caulk between the vanity top and the wall.