How To Change Undermount Bathroom Sink

How to Change an Undermount Bathroom Sink: A Step-by-Step Guide

Replacing an undermount bathroom sink requires careful planning and execution to ensure a successful installation. Follow these steps to guide you through the process:

1. Preparation

Before starting, turn off the water supply to the sink and drain the faucet. Clear the cabinet below the sink of any items and prepare your tools, including a putty knife, adjustable wrench, pliers, and a new sink.

2. Disconnect Plumbing

Disconnect the water supply lines from the faucet. Use an adjustable wrench to loosen the nuts connecting the lines to the faucet and remove them. Next, detach the drain pipe from the sink. Loosen the slip nuts holding the drain assembly in place and pull the pipe off.

3. Remove the Old Sink

Carefully lift the old sink from the countertop. Avoid dropping or damaging it. Remove any leftover adhesive or caulk from the surface of the countertop and the underside of the sink.

4. Install the New Sink

Apply a generous bead of silicone caulk around the edges of the countertop where the sink will rest. Carefully position the new sink in place and press it firmly against the caulk. Use shims as needed to level the sink and prevent it from wobbling.

5. Reconnect Plumbing

Reconnect the water supply lines and the drain pipe. Tighten the nuts on the water supply lines using an adjustable wrench. Slide the drain assembly back into place and secure it with the slip nuts.

6. Seal the Sink

Apply a thin bead of silicone caulk around the seam between the sink and the countertop. Smooth the caulk with your finger or a wet cloth to create a watertight seal.

7. Turn on Water Supply

Slowly turn on the water supply to the sink and check for leaks. Tighten any loose connections as needed. If there are no leaks, allow the caulk to set for 24 hours before using the sink.

Tips:

Measure the old sink before purchasing a new one to ensure the correct fit.
Use a level to make sure the new sink is installed evenly.
Allow ample time for the caulk to dry to prevent leaks.
Protect the countertop and floor from adhesive or caulk spillage with a tarp or drop cloth.
If you encounter any difficulties, consult a professional plumber for assistance.