How To Plumb a Pedestal Sink



Removing the Old Sink

A pedestal sink can make a bathroom look more open and stylish. No matter your reason for installing a pedestal sink, we?ve got you covered.

Before purchasing or obtaining a sink, you?ll want to remove your old sink. The reason for doing this is that you?ll want to choose a sink that fits with the existing waste, vent and water rough-in. If you get a sink, and it doesn?t end up fitting, you?ll have to alter the rough-in or you?ll have to return it. We?d like to help you avoid that extra hassle. Pedestal sink plumbing is simple and shouldn?t take you more than a day or so to complete.

Once you?ve rounded up these tools, it?s time to remove the old sink.

Begin by turning off the sink?s water supply. Turn a faucet to relieve water pressure in the sink?s pipes. Place your bucket underneath the P-Trap ? the P-shaped tube directly under the sink?s bowl ? and loosen the slip nut at the top of the trap. Remove the trap, making sure to empty any water into your bucket as you take it out.

Relocate your bucket to be directly beneath the water lines. Disconnect each one with your adjustable wrench, catching any water that spills out in your bucket.

Your existing vanity top will probably have some sealant along the top and sides, it may be silicone caulk or some type of mastic. Go ahead and cut the sealant with your utility knife.

Safety Glasses

Safety Glasses
Adjustable Pliers (Channel Locks) Monkey Wrench
Utility Knife
Rubber Mallet
Hammer and Chisel
Drill and Drill Bits

Power Drill

Stud Finder, or Equivalent

Power Drill
Stud Finder, or Equivalent
Silicone Sealant
Plumber?s Tape (recommended)

If you are planning on keeping your existing sink, you can loosen the vanity top from the sink using a rubber mallet. This will usually loosen the top without cracking the surface. If someone was using a mastic glue too liberally you may have to use a thin chisel or a putty knife to gradually break the seal. ÿOnce it is sufficiently loose, carefully remove it. You should probably obtain help when removing this piece, as vanity tops are usually quite heavy.

You should now be able to see inside your old sink base from the top. Usually, there are screws to remove before you can extract the base from the bathroom.

You can reinstall your P-Trap at this point, as you?ll need it in place when picking out a sink.

Measure the distance from finished wall to the center of the p-trap, from the floor to center of the waste opening and from the floor to the center of the water supplies coming out of the wall. You?ll also want to be sure the sink will fit in your bathroom in general. You have no idea how many times we?ve gone into a customer?s home to install an owner supplied pedestal sink only to find that the bathroom door won?t open or close because the sink it too long or wide. Also worth noting, check the height on the fixture if you have an existing mirror in place.

Once you?ve picked out your sink and faucet, you can begin by placing them in your bathroom. You won?t be doing any installation just yet, just lining things up and doing a bit of eyeballing.

Pedestal Sink Installation

Place the base in the bathroom, move it into place against the wall. You?ll want the P-Trap to be inside the base?s cutout, and the base to be in between the water supply shutoffs. Again, you?re just making sure everything fits at this point ? you aren?t installing anything permanently just yet.

Once the pedestal is in place, place the sink on top and verify that it fits snugly. Often there is a ?lip? on the bottom of the sink that should be completely covered up by the pedestal. Adjust the sink and pedestal until this is the case.

Installing Your Sink on the Pedestal

Now, you?ll want to adjust the pedestal and sink until the sink sits flush against the wall.

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