How to install and undermount bathroom sink

To stay safe, you can even apply silicone on the edges of the hole that you have made on the countertop. Then precisely place the under-mount washbasin on the shaft of the countertop and check whether it is the center position. You can even take help from someone so that the washbasin can line up correctly with the hole on the countertop as they are quite heavy.

Now, either you can apply a little amount of pressure or leave it as it is so that it can adhere appropriately to the silicone. You can even glue the sink with the countertop without flipping it, but it would take the right amount for the seal to get thick. Moreover, you will need sturdy mounts to hold the sink securely, and it is quite hectic to continue the installation process from the underside of the tub.

These mounting clamps are metal clips that can hold heavy washbasin easily without damaging the countertop. Then mark the areas where you put the mounting clips and then make a hole in those areas with the drill. Then you have to use screws to the mounting clips that will attach both bodies together; however, it might cause some silicone to come out due to pressure.

You can use a drill bit as it will properly tighten the screws properly which might not be possible standard screwdrivers. So after mounting the clips, you should allow the adhesive to get dry for at least 8 hours, but it would be ideal if you will enable them to rest more than 20hours. While drilling holes and tightening screws, you should be careful with the pressure otherwise you might damage the top layer of the countertop.

After you sink down the screws in the hole, it will squeeze out some silicone so you can use acetone or normal wet cloth to clean them. Then with the help of drill and hand saw make a proper hole for inserting the lower section of the faucet. Before flipping, take your caulking gun along with silicone and apply them on the edges of the base counter.

You should use a thick layer of silicon on the base counter so that it properly get attached to the top shelf. Ask one of your family members to hold one side of the countertop and another member to keep the sink properly. Then carefully place the pan over the bathroom vanity or base counter. While you place the top counter over the base counter it will spill some silicon on the edges of the top, so you need to clean them immediately otherwise it would get thick.

First, you have to attach plastic or rubber gasket attach to the table and then place the tap over it. Next, use the washer along with nut to bolt down the faucet in place, and you should use your wrench to secure them properly. Then move to the lower side of the base counter and attach the tail end of the faucet with another washer and bolts.

You can even use putty or silicone adhesive to keep the lower section intact in its position. This same step should be applied to other handles only if you are installing a widespread faucet on the countertop. First, you will have to take the drain cover and apply silicone or putty on the lower section of the pipe.

Then quickly place the drain cover over the drain opening and apply pressure so that it gets adequately placed in the hole. Wipe out the excess silicone or putty from the basin otherwise, it will look tacky. After putting it, go to the lower section and use screws to tighten the drain cover.

Once all the equipment is in their respective, you should allow the base counter adhesive, bathroom faucet silicone and drain cover adhesive to get dried. First, attach the drain line with the drain opening, and it is advisable to use connectors to seal the connection areas. The water line alignment should be correct otherwise you might not get a proper force. Similarly, it would be ideal to use the P trap as it will be safe and will secure connectivity. It will also allow you to check if there is any leak in the connectivity.

Please log in with your username or email to continue. No account yet? Create an account. Edit this Article. We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article methods.

Tips and Warnings. Things You'll Need. Related Articles. Method 1. Measure the hole in the countertop if it has already been cut. If you are replacing a sink or working with a pre-cut countertop, figure out what sink size you need. Measure the length and width of the hole that will hold the sink. If your sink is over a cabinet, measure the depth of the cabinet as well.

Replace it with a new sink the same size. Keep in mind that hard counters, like marble, quartz, and granite, often work better for this project than laminate or tile countertops. Figure out where you want to install the sink. The location depends on a few factors, such as the location of the water supply lines in your home. Most sinks sit in the middle of countertops, but some installers choose a different aesthetic. Stone and concrete countertops work best with undermount sinks.

Wood, laminate, and other types of countertops tend to crack during the installation. Select a reveal style for your sink. This is important for appearance, but also has some effects on cleaning. The rim will get dirty, similar to a regular drop-in sink. The overhanging countertop edges tend to get dirty and are hard to clean.

Flip the sink over and trace around it with a pencil. Then, remove the sink and measure the width of the rim. Simply put the template over the countertop, then trace it to size the opening correctly.

Remember that the rim will rest against the countertop after the installation. For the most part, only the bowl of the sink will be visible. Cut the countertop with a circular saw or jigsaw. Put on safety gear, such as a dust mask and goggles. Then, choose the right saw for the material you wish to cut. For a material such as laminate, choose a jigsaw with a special laminate-cutting blade. Not everyone has the tools needed. These countertops are also expensive, so damaged surfaces are not fun to contend with.

Be sure to give your countertop fabricator the exact measurements of your new sink so they can cut it with precision. To make holes for the accessories like the faucet, use a drill.

Choose a drill suitable for the countertop, such as a masonry bit for stone and concrete. Clean up the countertop and sink with denatured alcohol. Remove old caulk, sawdust or other debris on the countertop. Use a scraper to eliminate any dried-out adhesive around the opening. Scrub it with a rag dampened in denatured alcohol to remove leftover debris.

Unscrew the brackets under the sink by turning the wingnuts counterclockwise. Remember to shut off the water lines and detach the plumbing before attempting to lift the sink out. Method 2. Stack boards underneath the countertop to hold up the sink. Many undermount sinks need to be lifted into position underneath a countertop.

Center the sink in the middle of the hole in the countertop. Adjust the sink and the wood supports as needed. Align the rim of the sink with the cut edges of the countertop if you're going for a zero reveal aesthetic. Look down from above to make sure the sink is exactly where you want it. Make sure it is even on all sides. Clamp the sink to supports to hold it in place while you install it. Set a piece of wood underneath the sink, then set another piece over the hole in the countertop.

Pull the drain stopper out of the sink and lower the adjustable clamp through the drain. Clamp the boards so the sink stays suspended about 1 in 2. Run a clamp through each drain.

Another way to do this is with an undermount sink harness. The harness clips to the sides of the countertop. You then tighten the harness to lift the sink into place. Glue the studs to the underside of the counter with an epoxy paste.

Get some undermount sink clips along with a bottle each of epoxy resin and hardener. Mix equal amounts of the resin and hardener together with a wooden stirring stick. To install the studs, hold them to the countertop and spread glue over them with the stirring stick. Keep them no more than 10 in 25 cm apart. Spread silicone caulk around the countertop. Cut the tip off a canister of caulk and set it in a caulk gun. The bead of caulk needs to be above the rim of the sink. Choose a canister of a waterproof silicone caulk from a hardware store.

This kind of adhesive holds undermount sinks in place long-term. Tighten the clamps to bring the sink up to the countertop. Tightening the clamps raises the sink so it presses against the caulk.

Adjust it before the caulk solidifies. Once the caulk solidifies, moving the sink becomes much more difficult. Install the sink clips and wingnuts over the glued studs. Fit a clip over a stud, then tighten it in place with a wingnut. Twist the wingnuts clockwise to tighten them. When the sink clips are installed correctly, they secure the sink tightly to the countertop. If you notice a gap, the clips may not be on tight enough.

Always tighten the wingnuts by hand. Overtightening them can damage the countertop. Wipe away excess caulk with a rag and denatured alcohol. Pushing the sink against the countertop may cause some of the caulk to squeeze out. Wipe it up right away to prevent it from hardening.

If it begins to harden, dampen a rag with some of the denatured alcohol, then use it to scrub away the caulk. You will need a scraper or sharp blade to cut off the caulk. Scrub the remainder off with denatured alcohol. If you do leave behind some caulk, at least no one will notice it underneath the sink! Mount the faucet and other accessories over caulk. Set the accessories on top of caulk. After centering them over the holes in the countertop, install the water lines.

Run the lines up through the faucet and control knobs to finish the sink. Let the caulk dry for 24 hours before attempting to use it. Method 3.