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how to fit a undermount kitchen sink

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Here are the steps for installing an undermount sink:Cut a hole in the countertop for the sink. Some undermount sinks come with a template. …Apply the epoxy to the edges of the sink.Position the sink on the underside of the countertop,ensuring it’s perfectly centered.Use the clips or brackets to attach the sink for additional support if using.Wipe away any epoxy or caulk that squishes out of the sink.More items

What do you need to know about undermount kitchen sinks?

With your old sink removed,measure the area just as you did in step 1.First,measure from side to side and then back to front. …It’s important to pay attention to your corner ratio. …For an undermount sink,the cutout should match the new sink’s interior measurements.More items…

How to select an undermount sink?

Sink size depends on kitchen size. The size of your kitchen usually dictates the size of the sink you should choose. …Larger sinks may require customization. …Have your faucet and sink accessory configuration planned out beforehand. …Decide how you will use the sink on a day to day basis to determine what configuration will work best for you. …

How to organize under a kitchen sink?

How to organize under the kitchen sink. Here’s a simple guide to help you organize that space under your kitchen sink. Let’s do this! 1. Clear out and clean up. Start with a blank slate. Take out all the contents until the space is bare. Place the items in a space where you can gather them in a way that you see everything.

How to unclog sink in a kitchen?

ToolsPlunge the Kitchen Sink. Before unclogging kitchen sinks with standing water,use a cup or basin to remove the water. …Use Boiling Water to Dislodge the Sink Clog. Bring a half gallon of water to a rolling boil over high heat. …Inspect the Garbage Disposal. …Dissolve Clog with a Baking Soda Mixture. …Use a Wet-Dry Vacuum to Clear the Sink. …More items…

Undermount Sink

You can replace an undermount sink to add a sleek, fresh feel to your kitchen or bath, plus it’s a simple way to upgrade a room. Unlike a drop-in sink, there’s no visible rim, crevice or lip to catch dirt with an undermount sink, making cleaning the counter easier. Undermount sinks also provide slightly more counter space.

Removing the Old Sink

Before you remove the old sink, take a few pictures of the drain setup in case you need to reference it later.

Installing the New Sink

Now that you’ve removed the old sink and cleaned the underside of the countertop, you’re ready to install the new sink.

Putting Up Your Workspace

Before you install an undermount sink on a cabinet base, its best to attach it to a counter-top. A sink base has limited space and will appear awkward if you do otherwise but if for personal reasons you consider installing a sink with its top in place or want to reset the current undermount sink which is detected from underneath the counter.

Right-Side down or Right-Side Up? Is This a Tricky Question?

Although, there are professionals sink installers who prefer to have their job done underneath the counter while facing upward on a table that provides maximum support. While others will prefer a finished surface, that is position upward. This wholly depends on individual preference; as each style has its pros and cons.

Bottoms-Up Installation

It is pretty easier and faster to get sink installed using its underside, though the technique may appear a little weird if you want to know if each sink is rightly positioned on the spaces you created to get an anticipated reveal treatment. If you want to get a head start, you will need to slab the underside and the work stand to face upward.

A View from the Top??

Most installers will prefer to install sink using the counter-top right side up. They believe doing so can provide a perfect view of the reveals at the last stage of the sink clips to be well fastened to hold the sink that is in the underside.

To Suspend the Sink Beneath the Cutout

Get two scraps of 2 by 6 inches. Boards that are approximately 2 ft. Ensure it extend more than the sink.


Undermount sinks are a little tougher to install than drop-in sinks and they don’t work with all countertops.


Always use the correct safety gear when handling a saw, including goggles, a dust mask, and ear protection. Avoid long clothing that could get caught in the saw blade.

About This Article

This article was co-authored by Eric Shipe. Eric Shipe is a Kitchen and Bath Designer and the Owner of Bath + Kitchen based in Washington DC. Eric and his team specialize in cabinetry, design, and remodels.


An undermount kitchen sink is a type of sink that is installed beneath the surface it is mounted on rather than within the countertop it is mounted on.


There are a variety of advantages to using undermount kitchen sinks, including the following:

The Disadvantages of Installing a Kitchen Sink in the Undermount Position

Undermount sink models, like all other types of kitchen sinks, have their own set of drawbacks that must be taken into consideration. Some of the most frequently encountered ones associated with these products are as follows:


Undermount kitchen sinks are available in various materials, each with its own set of benefits and drawbacks to consider. The materials used to construct kitchen sinks are of the highest quality, either metal or porcelain.


Before you begin working on your undermount kitchen sink installation project, make sure that all of the items on your countertop have been removed.

What is the difference between a drop-in and an undermount kitchen sink?

Undermount kitchen sinks are distinct from drop-in styles in that they were traditionally installed beneath your countertop and secured in place with screws.


If you’ve been looking to update your kitchen and want a sleek new sink, we have some great tips for installing an undermount kitchen sink.

What to Consider Before You Get Started

If you’ve ever installed a drop-in basin in the kitchen, you likely know what’s involved in hooking up the drain and faucet, and the procedure isn’t much different for an undermount sink installation. However, mounting the sink itself can be complicated based on the weight of the vessel.

Attaching an Undermount Sink

It’s difficult to support an undermount sink — even a lightweight one — while you draw its outline on the underside of the cabinet and set the clips. You aren’t likely to find anything to place underneath that’s exactly the right height, and even if you do, wedging the tight-fitting support below the sink may be difficult.

Choosing Sink Clips and Supports

When you purchase a new sink, the sink clips come with it, but if you’re installing a recycled sink or if you lost the clips, you’ll have to buy some. The most common clips consist of threaded posts mounted to flat disks with holes and metal brackets that fit over the posts and get secured with wingnuts.

Installation Steps

Here’s a step-by-step guide on installing your sink from start to finish. After ensuring you have all the supplies needed for the job, take a look through our guide below to make your plan of attack.

Step 1: Clean up and get ready

Remove everything from the sink cabinet, and take out all the shelves. You’ll need all the available working room possible. Get a headlamp so you can see what you’re doing without having to hold a flashlight.

Step 2: Clean the underside of the countertop

Wipe dust and oils from the underside of the countertop using a damp rag or cloth soaked with acetone or alcohol. Dust and oil can interfere with epoxy and silicone caulk adhesion, so it’s important to remove all of it. While you’re at it, clean the whole sink area, so no debris winds up in the nooks and crannies.

Step 3: Clamp the sink in place

Get a helper to position the sink roughly under the cutout, and secure it with a bar clamp. Be sure to readjust right before fully tightening the clamp. If the sink has two drain holes, use two clamps.


Before you install a sink on your kitchen countertop, you need to take preparation. First, you need to clean both the countertop surface and the sink surfaces.

Silicone Adhesive

Several adhesives are available on the market that is used for kitchen sink installation. The material of an adhesive is used to seal around the sink after installation. It is usually used around the contact surface of the sink.


If you want to install an undermount sink, you need to install it to the bottom of the countertop.


After installing the sink, you need to clean the sink and the countertop immediately. You have to remove the excess sink edges and dirt from the surface of them. When you tighten the clamps, some silicone seeps out from under the sink edges.


Finally, you need to add additional support to incorporate garbage disposal. It is important to add additional support when you install an undermount sink without hardware.

Taking Measurements

Correct measurements are imperative for seamless installation. If you end up cutting a too-large hole in your countertop, you’ll run into a world of issues as your sink will not fill the gap entirely, and you’ll need a new slab of the countertop.

Measuring For The Hole

Once you have your list of sink dimensions, you can proceed to the next step, which is slicing a hole in the countertop in question. Before you start chopping away at the countertop, you need to do a few calculations.

Measuring An Undermount Sink For Replacement

Over time and with heavy use, kitchen sinks become worn out. If you need to replace your old sink entirely, it is usually easiest to remove it and get your measurements. Sinks with a wide lip may leave a greater available width, so ensure that you correctly measure the sink before purchasing a replacement.

What Size Undermount Sink Do I Need?

If you’re replacing your current sink, you’ll need to find a sink that meets the existing space. When determining what size of undermount sink you need, it’s essential to consider several additional factors that may impact your decision.

How Are Undermount Sinks Installed?

Unlike other sink types, like drop-in sinks that support themselves on the countertop, undermount sinks require more work. As the name implies, the sink is attached beneath the countertop.

What You Need To Know About Installing Kitchen Sink Clips

There are two main types of kitchen sink installation: undermount and overmount.

How To Install Kitchen Sink Clips (5 Steps)

Now, you need to learn the steps involved in installing kitchen sink clips. Follow these 5 steps to do the job yourself without the help of a plumber.

Final Thoughts on How to Install Kitchen Sink Clips

You need to attach your sink to your countertop properly. You can do that with kitchen sink clips that fit on the bottom of the sink bowl. You need kitchen sink clips for most sinks. However, it all depends on both the sink and the type of countertop.

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