Removing an undermount sink from a quartz countertop can seem daunting, but with the right tools and techniques, it can be done successfully without damaging the countertop. Here is a step-by-step guide on how to remove an undermount sink from a quartz countertop.
Gather the Necessary Tools and Materials
Before starting, make sure you have the following tools and materials on hand:
- Safety glasses and work gloves for protection
- Pry bar or putty knife to help break the sink seal
- Oscillating multi-tool or angle grinder with a diamond blade to cut through silicone caulk
- Mineral spirits and rags to clean off old caulk residue
- Isopropyl alcohol and clean rags to prep the countertop surface
- Silicone caulk and caulk gun for re-installing the sink later
Disconnect the Plumbing
The first step is to disconnect the sink plumbing by unscrewing the P-trap assembly and detaching the supply lines. Turn off the shutoff valves for the supply lines under the sink and relieve any remaining pressure by turning on the faucet briefly. Place a bucket under the pipes to catch any water that drips out.
Break the Sink Seal
Run a pry bar or stiff putty knife around the rim of the sink to break the seal between the sink and countertop. Gently pry upwards while working the knife around to loosen the sink. Be careful not to scratch or gouge the countertop surface. Applying mild heat with a hairdryer can help soften the caulk seal.
Cut Through the Caulk
Use an oscillating multi-tool or angle grinder with a sharp diamond blade to cut through the caulk around the perimeter of the sink. Wear eye protection and work slowly. The blade should only be cutting through the silicone caulk seal, not grinding the countertop itself.
Remove the Sink
Once the caulk seal is cut through, the sink should lift out easily. Pull it up and out, being careful not to scratch the countertop edges. Some adhesive may still be sticking, so be prepared to gently pry and break it free as needed.
Clean the Countertop Surface
Use mineral spirits and rags to remove all old caulk residue from the countertop. Then wipe the surface down with isopropyl alcohol to prep it for re-caulking later. Inspect for any damage or uneven areas and address as needed. Allow the countertop to fully dry before moving on.
Prepare and Install New Sink
Follow the manufacturer’s directions to properly prepare and install your new undermount sink. Be sure to use 100% silicone caulk rated for use with quartz countertops. Apply a smooth, consistent bead and make sure the sink edges are sealed all around.
Re-Connect Plumbing
Once the new sink is securely installed, reconnect the plumbing by attaching the supply lines and P-trap assembly. Turn the water back on slowly and check for leaks. With the sink in place, you can then re-install the sink drain pipes, supply line hoses, and garbage disposal if needed.
Clean Up and Test
Remove any excess caulk and clean the area well with denatured alcohol. Let the caulk fully cure for at least 24 hours before using the sink. Slowly test for leaks by filling the sink with water and checking underneath for any drips.
With the proper tools and techniques, removing an undermount sink can be done without damaging the quartz countertop. Take your time, be careful not to scratch or gouge the surface, and make sure to prep for re-installation to get a water-tight seal with the new sink.
Frequently Asked Questions
What tools do I need to remove an undermount sink from a quartz countertop?
You’ll need a pry bar or putty knife, an oscillating multi-tool or angle grinder with a diamond blade, mineral spirits and rags, isopropyl alcohol and clean rags, silicone caulk and a caulk gun. Safety gear like gloves and eye protection is also recommended.
How do I disconnect the plumbing before removing the sink?
Unscrew the P-trap assembly and detach the supply lines. Turn off the shutoff valves and relieve pressure by briefly turning on the faucet. Place a bucket underneath to catch drips.
Should I cut through the caulk with a knife?
No, you should use an oscillating multi-tool or angle grinder with a sharp diamond blade to carefully cut through the caulk seal around the perimeter of the sink. This prevents scratching or gouging the countertop surface.
What’s the best way to clean the countertop surface after removing the sink?
Use mineral spirits to remove old caulk residue, then wipe the surface down with isopropyl alcohol. Inspect for damage and allow to fully dry before installing the new sink.
How long should I let the caulk cure before using a newly installed undermount sink?
Let the caulk fully cure for at least 24 hours before using the sink. Slowly test for leaks by filling the sink and checking underneath for drips.
Can I pry off an undermount sink without cutting the caulk seal?
You may be able to pry and pop off an undermount sink without cutting the caulk first, but this risks scratching or damaging the countertop. Cutting through the caulk first is the safest method.
Conclusion
Removing an undermount sink from a quartz countertop without damage takes time, care, and the right techniques. Following detailed steps like disconnecting plumbing, breaking the sink seal, cutting through caulk, cleaning the surface, and properly re-installing the new sink will help ensure success. Having the proper tools on hand is also key. With some patience and caution, a DIYer can tackle this project and end up with a pristine countertop around their new sink.