Undermount Sink

How to Install an Undermount Kitchen Sinks

Undermount kitchen sinks are perfect for countertops because of their slim design, which makes cleaning easier. Additionally, they are not always as straightforward to install as drop-in sinks. This comprehensive tutorial teaches the ins and outs of establishing an under-mount sink.

Undermount Sink
Undermount Sink

Undermount Sink Facts

Just as its name implies, an under-mount sink is a kind of sink that is installed under a countertop in a kitchen or any other space. The top of the counter is where you’ll find the drop-in sinks.

Due to its sleek design and absence of a lip or fissure, the under-mount sink’s “hidden” edge is less likely to collect debris.

Undermount Sink
Undermount Sink

Undermount sinks are often made of copper, cast iron, or stainless steel. These sinks are available with either one or two bowls.

Laminate counters may not be the best choice for an undermount sink, but solid surfaces like quartz and granite are great. They could cost a little more than those drop-in sinks.

Types of Undermount Sink Installations

Undermount sinks come in three distinct varieties, each identified by its unique “reveal style,” or the amount of the sink’s rim that can be seen after installation.

Sink Trap
Sink Trap

If the reveal is zero, the countertop’s edge will be flush with the sink’s aperture.

You can see over the countertop’s edge and into the sink’s rim with a positive reveal.

How to Install an Undermount Kitchen Sinks

Because the sink’s rim is hidden under the countertop due to the negative reveal, the countertop edge extends beyond the sink.

Unlike sinks with positive or negative reveal, zero-reveal sinks are often simpler to clean. Alternatively, you may choose a style according to your taste.

Prepare and Cut the Countertop

Consider the placement of the water mains and other plumbing equipment when deciding where to put the washbasin in your bathroom or kitchen.

Countertop Sink
Countertop Sink

Find the diameter of the sink’s opening. Inverting the sink and drawing the contour on the countertop with a pencil is the quickest and most straightforward method. You may use the cardboard templates with specific sinks to measure the holes for the sink.

Because the first outline will be a little extensive for the sink’s opening, you’ll need to cut out a second one that’s half an inch smaller.

Wear protective eyewear and gloves while you use a jigsaw or circular saw to cut the hole.

You may use a power drill if you need to drill more holes for the tap or any other accessories.

Using denatured alcohol, wipe off the washbasin and the countertop.

Advice: Consider getting a specialist to help you cut granite countertops because of the high initial cost and the difficulties of doing it yourself.

Unattached Countertop Installation

When installing an under-mount sink, you may choose between two typical ways. Attaching the sink to the countertop before attaching the countertop to the base cabinets makes the installation process more straightforward. This will come in handy when installing a trash disposal in your sink. To flip the countertop, you’ll likely need the assistance of a second person.

Before installing the sink, ensure there is enough space beneath the countertop on all sides.

Invert the countertop so that the underside is now visible.

Trace a line across the hole and position the washbasin in the middle.

Place the washbasin mounting clips in the corners and space them 10 inches apart along the sides.

Attach the washbasin clip studs using construction adhesive. Pay attention to the drying time guidelines.

Put a thick bead of silicone caulk around the inside border of the shape and apply it to the countertop using a caulk gun.

After setting the sink on the countertop, secure it with the included wingnut clips.

Apply denatured alcohol to a cloth and use it to wipe up any excess caulk. After 24 hours, or as directed by the manufacturer, let the excess caulk dry.

Complete the installation by turning the countertop over. Install the water supply lines, waste disposal, and faucet fittings according to the instructions.

Helpful hint: If you’re considering installing an under mount sink on quartz worktops, try this method first.

Attached Countertop Installation

Before you remove the old sink and install the new one, ensure the water is turned off, unplug all pipes and faucets, and remove the old sink. Make sure the waste disposal is cleared.

Use an adhesive remover and a scraper to remove old epoxy and detach old washbasin brackets.

Underneath the counter, attach washbasin clips as required.

Position boards, such as 2-by-4-inch planks, behind the countertop, to support the sink.

Put a thick bead of caulk around the countertop’s edge using a caulk gun.

To create a watertight seal, raise the washbasin until it rests on the bottom of the countertop. To secure the washbasin in place, use shims and boards as necessary.

Secure the sink to the countertop using the sink clamps.

Using a cloth and denatured alcohol, remove any extra silicone sealant you can reach. Let the excess caulk dry after 24 hours or as the manufacturer directs.

Take the boards and shims off.

Before turning on the water, ensure the drain, faucet, pipe fittings, and trash disposal are connected.

Installing an undermount kitchen sink is a task that most people who want to do it themselves can do. The correct resources, including time, are all that’s required. Cutting the countertop, mainly granite or quartzite, is the most challenging aspect. For projects requiring undermount sinks in your kitchen or bathroom, installation services are an option to explore if you would like assistance.

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