Installing Undermount Bathroom Sink

By | September 5, 2021

Installing an Undermount Bathroom Sink: A Comprehensive Guide

Undermount sinks are a sleek and modern addition to any bathroom. They create a seamless look by mounting below the countertop, eliminating the rim that collects dirt and grime. Installing an undermount sink requires some plumbing and carpentry skills, but it's a doable project for the average DIYer. Here's a step-by-step guide to help you through the process:

Step 1: Gather Your Materials

Before you start, gather the necessary tools and materials. You'll need:

  • Undermount sink
  • Countertop
  • Sink clips or brackets
  • Silicone caulk
  • Plumber's putty
  • Drill
  • Screwdriver
  • Hacksaw
  • Measuring tape
  • Level

Step 2: Prepare the Countertop

Measure and mark the opening in the countertop where the sink will go. Use a jigsaw or hacksaw to cut out the opening. Make sure the opening is the same size as the sink base.

Step 3: Install the Sink Clips

Attach the sink clips or brackets to the underside of the countertop around the perimeter of the opening. These clips will support the sink.

Step 4: Apply Silicone Caulk

Apply a bead of silicone caulk around the perimeter of the countertop opening. This will create a watertight seal between the sink and the counter.

Step 5: Place the Sink

Carefully place the sink into the opening. Make sure the sink is level and flush with the countertop.

Step 6: Secure the Sink

Tighten the screws on the sink clips or brackets to secure the sink in place.

Step 7: Install the Drain

Install the drain assembly according to the manufacturer's instructions. Use plumber's putty to seal the drain flange to the sink.

Step 8: Connect the Faucet

Connect the faucet to the water supply lines under the sink. Tighten the nuts to secure the connections.

Step 9: Apply a Finishing Bead of Caulk

Apply a finishing bead of silicone caulk around the seam between the sink and the countertop. This will ensure a watertight seal.

Step 10: Clean Up

Once the caulk has cured, clean up any excess caulk and debris. Your new undermount sink is now installed and ready to use.


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