How to Install a Wall-Mounted Sink With a Pedestal

Mount a backer board, if required by your manufacturer, for your pedestal sink. Place the sink on top of the pedestal and measure the distance from the base of the pedestal to the top of the sink. This tells you the height of the backer board.

Remove any tiles from the wall with a hammer and chisel before sawing away the drywall with a keyhole saw or jigsaw to access the studs. Mount the backer board horizontally across the studs and secure with screws. Replace the wall material and tile over the backer board surface by applying tile mortar and then mounting the tiles. When dry, fill between the tile spaces with grout.

Clean off the basin with a rag and mild soap solution to remove any chemicals. Dry thoroughly.

Roll out a bead of plumber's putty and press it in place around the perimeter of the sink drain opening. Screw the drain flange into the sink tailpiece. Insert the flange and tailpiece into the sink drain opening. Mash down plumber's putty. Secure the flange and tailpiece from underneath with the jamb nut. Wipe up any excess putty.

Place the sink on top of the pedestal. Move the sink and pedestal adjacent to the wall so the pedestal covers the sewer pipe opening. Level out the pedestal and base with an electronic or spirit level. Mark through the holes in the back of the sink where it touches the wall with a pencil or marker and around the base of the pedestal. Move the sink and pedestal out of the way.

Drill holes in the wall with a power drill. Insert lag screws into the openings and turn clockwise to tighten in place.

Connect an extension and P-trap to the sewer inlet. Before connecting the joints, apply plumber's tape to the threads.

Move the pedestal to its marked location covering the P-trap. Place the sink on top of the pedestal so the tailpiece underneath the sink slides into the P-trap. At the same time, align the back of the sink allowing the lag bolts to slip through the holes in the back.

Screw the coupling tight between the P-trap and the tailpiece by turning it clockwise.

Thread the lag bolts and washers onto the lag screws to secure the sink. Secure the pedestal to the floor with additional screws, if desired.

Align the faucet so the spout is facing the front of the sink and the inlets are over the appropriate holes at the back of the sink. Insert the faucet body into the sink. Secure from beneath with retaining screws.

Wrap the threads on the faucet inlets and the water supply valves beneath the sink with plumber's tape. Connect the wider end of a water supply pipe to the inlet on the faucet. Tighten the coupling with a wrench or pliers. Connect the other end to the water supply valve. Repeat the process for the other faucet inlet and supply valve.

Turn on the water supply valves. Open the faucet tap and let water run into the sink. Tighten the supply hose couplings or drain pipe connections as needed.