Sinks are mounted to a counter in three different ways.
Porcelain sinks are common to most bathrooms and some kitchens. There are three basic porcelain sink types: vessel or top-mounted, rim-mounted and undermounted. Each of these types of sinks mount to the countertop differently. Many sink installations can be done by a homeowner. Some manufacturers recommend that undermount sinks be installed by professional installers for best results.
Instructions
Vessel Sinks
1. Attach your vessel sink with white tub caulking after you have installed your faucet and water lines. Apply the caulk with a thick bead around your pre-cut countertop hole. Make sure the sink is perfectly lined up with the hole and allow the sink to sit for 24 hours.
2. Feed your pop-up drain through the drain hole once your sink is firmly set. Look underneath the counter to make sure there are enough threads extending from the drain for the pop-up connecting nut and the drain exterior pipe to be installed.
3. Caulk the pop-up flange to the sink. Add plumber's tape to the drain threads on the underside of the counter and attach your connecting nut and the drain exterior pipe. Tighten your connecting nut until the sink is held firmly. Over tightening may cause sink breakage.
Rim-Mounted Sinks
4. Turn the sink upside down after you have installed the faucets and drain assembly and pre-fit the sink to your countertop hole. Cushion the sink with a towel.
5. Apply a 1/4-inch bead of 100 percent silicone around the perimeter of the sink rim.
6. Lower the sink into position. The silicone should flatten out and ooze out from under the rim of the sink. Wipe off any excess.
7. Attach mounting clips as necessary. (Most porcelain bathroom sinks do not require mounting clips to hold them in position. Clips are more frequently used with very light sinks and laminate counter tops.) Do not use mounting clips for bathroom porcelain sinks over granite or stone counters as installing the clips to the granite could cause damage to the stone.
Undermount Sinks
8. Turn the countertop upside down after you have pre-fit the sink to your countertop hole. Cushion the countetop with a towel.
9. Apply a thick bead of 100 percent silicone or an epoxy rated for mounting porcelain sinks to your countertop around the underside, perimeter edge of the sink hole.
10. Align the sink carefully so that the hole and the sink fit perfectly. Allow the silicone or epoxy to dry completely. Some epoxies dry in 8 to 12 hours. Silicone should dry for at least 24 hours.
11. Turn your countertop and sink back over and continue with your installation.
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