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Design

How to plumb a pedestal sink

Skill Level

Start to Finish

Tools

  • socket wrench with 8″ extension
  • slip-joint pliers
  • level
  • tape measure
  • adjustable wrench
  • pipe wrench
  • drill
  • square
  • pencil
  • sockets

Materials

  • plumber’s putty
  • pedestal sink
  • faucet
  • drain assemblies
  • P-trap assembly
  • Teflon tape
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Introduction

Remove the Old Sink

Shut off the water at the main. Turn the water heater to “off,” or turn the switch to the “pilot” position if it’s gas. Drain the plumbing by opening a faucet. Remove the old sink and trap.

Take off the old lavatory stops. The plumbing for a pedestal sink is exposed, so all of the plumbing, including the stops need to be new. It will also be necessary to install a new chrome lavatory stop and escutcheon cover.

Step 1

How to plumb a pedestal sink

How to plumb a pedestal sink

Secure the New Escutcheon Covers

Using two adjustable wrenches, remove the old supply stops from the hot and cold water lines, and then remove the old escutcheon covers.

Thread New Supply

Apply Teflon tape on both stub outs, and then add new escutcheon covers by sliding the cover over the roughed in water supply. Thread new supply stops on both and use a wrench to tighten everything up. Ensure that the inlet valve is in the upright position.

Secure the New Escutcheon Covers

Using two adjustable wrenches, remove the old supply stops from the hot and cold water lines (Image 1), and then remove the old escutcheon covers (escutcheon: decorative metal shield that covers the faucet stem and the hole in the wall).

Apply Teflon tape on both stub outs, and then add new escutcheon covers by sliding the cover over the roughed in water supply.

Thread new supply stops on both (Image 2) and use a wrench to tighten everything up. Ensure that the inlet valve is in the upright position.

Unscrew the old collar nut, and then slide the new p-trap escutcheon cover over the drain hole.

Step 2

How to plumb a pedestal sink

How to plumb a pedestal sink

Place Lavatory on Pedestal

Place the lavatory on the pedestal, and then set it in the desired location. Make sure the lavatory is level

Mark the Sink

Be sure to center the pedestal to the drain hole on the wall. Once the pedestal is centered, use a pencil to mark where the sink will sit against the wall

Place the Lavatory on the Pedestal

Place the lavatory on the pedestal, and then set it in the desired location. Make sure the lavatory is level (Image 1).

Be sure to center the pedestal to the drain hole on the wall. Once the pedestal is centered, use a pencil to mark where the sink will sit against the wall (Image 2).

Step 3

How to plumb a pedestal sink

Thread Hanger Bolts

Use a pencil to mark where the anchor holes will be drilled in the wall and floor. After the holes have been marked, remove the sink from the area. Install the lag screws into the wood backing behind the wall. Ensure your bit is at least a size smaller than the lag bolts so they’ll hold tight in the wall.

Thread the Hanger Bolts

Use a pencil to mark where the anchor holes will be drilled in the wall and floor. After the holes have been marked, remove the sink from the area. Install the lag screws into the wood backing behind the wall. Ensure your bit is at least a size smaller than the lag bolts so they’ll hold tight in the wall.

Drill two 1/4″ holes for the hanger bolts at the marks on the wall. Thread the hanger bolts into the wall. Leave approximately 1-1/4″ of each bolt exposed between the cap nuts and the finished wall.

Step 4

Mount the Pedestal to the Floor

The pedestal sink must be mounted to the floor for stability. The technique for doing this will vary depending on the type of floor.

  • For drilling into concrete, use a hammer drill and a concrete bit. Simply add a lag screw, and then snug it down with a ratchet. Be sure not to over-tighten.
  • For drilling into tile, use a tile bit to drill the holes. A tile bit has a head like an arrowhead. Drill into the grout line if possible to prevent damage to the tile.

Note: Don’t apply sealant around the base of the pedestal. It could damage the floor if the sink ever needs to be moved.

Step 5

How to plumb a pedestal sink

How to plumb a pedestal sink

Dress Sink

Dressing the sink means to put all of the hardware on the sink before installation.

Install Spout and Handles

Use a roll of plumber’s putty around the seal to make sure it’s water tight. Insert the valve bodies into the proper mounting holes, ensuring that the valve body marked “cold” is installed to the right of the center hole. Once the valve body is in place, slide the metal washer and nut onto the base, and then tighten it down.

Dress the Sink

“Dressing” the sink means to put all of the hardware on the sink before installation (Image 1)

Install the spout and handles (Image 2) Use a roll of plumber’s putty around the seal to make sure it’s water tight. Insert the valve bodies into the proper mounting holes, ensuring that the valve body marked “cold” is installed to the right of the center hole. Once the valve body is in place, slide the metal washer and nut onto the base, and then tighten it down.

Place the seal ring over the spout body, and then insert the spout into the sink. Place the metal washer and nut onto the spout shank and tighten the nut with a wrench.

Install the hot water valve the same way as the cold water valve. Don’t forget to use plumber’s putty.