Instantly Modernize Your Kitchen with a Sleek New Undermount Sink
If your kitchen is in need of an update, one of the easiest ways to instantly modernize the space is by replacing your existing sink with a new undermount sink. Compared to bulky drop-in sinks, undermount sinks create a smooth transition from countertop to sink bowl for a seamless, high-end look. The sleek, minimalist style works with any decor from traditional to contemporary. And while it may sound daunting, installing an undermount sink is a surprisingly straightforward DIY project for an ambitious homeowner. With proper planning and preparation, you can complete the installation in a weekend. This step-by-step guide will walk you through everything you need to know to remove your old sink and upgrade to a stylish new undermount sink.
Step 1: Removing the Old Sink
Before installing the new undermount sink, the first step is to remove the existing sink. Start by gathering the necessary tools: basin wrench, adjustable wrench, hacksaw, channel lock pliers, screwdrivers, and a utility knife. You'll also need a bucket, rags, wood blocks, and eye protection.
Shut Off Water Supply and Disconnect Plumbing
Locate the shut off valves underneath or behind the sink and turn them clockwise to shut off the water supply. Disconnect and remove the supply lines, P-trap, garbage disposal (if applicable), drain pipes, and sink strainer. Unscrew any fittings by hand or use pliers or a basin wrench for a tighter connection. Place a bucket below to catch any water in the pipes.
Cut Sink Free From Countertop
Use a utility knife to score along the caulk seam between the sink and countertop. This allows the sink to detach cleanly. Carefully use a hacksaw to saw through the metal mounting clips securing the sink from below (this is easiest from inside the cabinet). Insert wood blocks as needed to support the cutout area once the sink is freed. Wear eye protection during this step.
Remove Old Sink and Clean Countertop
With the clips cut through, the sink should lift free. Remove any remaining caulk, clips, or debris from the countertop. Confirm the measurements of the countertop sink cutout match your new undermount sink size. The cutout edges should be smooth and level.
Step 2: Preparing the New Undermount Sink
With the old sink removed, shift your focus to preparing the new undermount sink for installation. First, assemble the necessary plumbing parts like supply lines, P-trap and drain baskets, garbage disposal, shut off valves, and faucet. It's easiest to attach accessories to the new sink before installing it. Refer to the manufacturer's instructions.
Install Sink Accessories
If possible, attach the new faucet, soap dispenser, strainers, and garbage disposal (if applicable) to the sink before lowering it into the countertop. Use plumber's putty or silicone caulk to seal around drain baskets and the garbage disposal flange. Tighten all locking nuts by hand first, then finish with a wrench.
Apply Silicone Caulk to Sink Rim
With accessories installed, run a bead of silicone caulk around the top outer edge of the sink rim. This helps create a watertight seal between the sink and countertop. Use masking tape and a caulk gun for the most even application.
Position and Secure Mounting Clips
Most undermount sinks include mounting clips to attach the sink to the countertop underside. Mark and pre-drill pilot holes for the clips following the manufacturer's recommendations for spacing. Test fit the clips to confirm they align with the pilot holes before securing them with a screwdriver.
Step 3: Installing the New Undermount Sink
You're now ready for the most crucial step: lowering the sink into place. This takes some finesse, so enlist a helper if possible. Safety gear like gloves and eye protection are also a smart idea.
Lower Sink into Countertop Cutout
Use a mechanical lift tool or have your helper assist with holding the sink in place against the countertop underside while aligning the mounting clips with the pilot holes. Insert screws into each clip to loosely attach the sink.
Reconnect Supply Lines and Drain Pipes
From inside the cabinet, realign the supply lines, P-trap, and drain assembly to the sink tailpieces and outlets. Hand tighten connections only first, using plumber's putty or Teflon tape to prevent leaks. Finish tightening with a wrench.
Confirm Proper Fit and Seal
Verify the sink is properly aligned and pulled tight to the countertop edges. Wipe away any excess caulk squeeze-out. Finish tightening the mounting clips until snug. Turn on the water supply and check below for leaks.
Apply Silicone Caulk Around Sink Edges
Once you've confirmed no leaks, apply a final bead of silicone caulk around the seam where the sink meets the countertop. Carefully smooth and shape the caulk with a wet finger for a clean finish. Allow the caulk to fully cure for 24-48 hours before using the sink.
Tips for a Successful Undermount Sink Installation
With good planning and attention to detail, an experienced DIYer can achieve professional-looking results. Keep these tips in mind: - Check existing countertop and cabinet measurements before selecting a new sink. - Assemble all tools, materials, and replacement parts before starting. - Take photos of plumbing connections to refer to when reinstalling. - Work slowly when cutting sink free and use wood blocks to support the countertop. - Seal all drain connections with plumber's putty or silicone caulk to prevent leaks. - Get help lifting and holding the sink in place if working alone. - Confirm proper fit, clip tension, and caulk seal before finishing the job.
Upgrading to an undermount sink is one of the easiest ways to instantly improve your kitchen's style and functionality. With your beautiful new sink installed, be sure to integrate other coordinating metal finishes like the faucet, cabinet hardware, and light fixtures. TASK Adventures updated the space with undermount sinks. You'll gain more usable countertop area and appreciate the streamlined look every time you walk into the kitchen.