Wall-hung toilet installation instructions

Written by michellejorgensen
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Wall-hung toilet installation instructions
Level top and lower nuts (level image by Albert Lozano from Fotolia.com)

Wall-hung toilets have been in residential as well as public rest rooms in Europe for more than 35 years. However, in North America, you usually see them only in public rest rooms. Residential architects and custom home designers have recognised the benefits of wall-hung toilets, and they are gaining in popularity in homes. It's easier to clean beneath a wall-hung bowl and these toilets take up less space than the traditional floor-mounted models. Installing a wall-hung toilet requires some skill.

Skill level:
Moderately Challenging

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Things you need

  • Closet carrier support
  • Toilet tank, seat
  • Felt or neoprene gasket
  • Nuts
  • Cap nut
  • Fibre washers
  • Metal washers
  • Rubber gasket
  • Putty knife
  • Screwdriver
  • Adjustable wrench
  • Sealant
  • Tape measure
  • Flexible supply tube
  • Carpenter's level
  • Helper

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  1. 1

    Ensure the closet carrier support has been installed behind the finished wall correctly prior to starting the installation of the wall-hung toilet. The wall carrier supports the tank on the wall.

  2. 2

    Lay backup nuts on the bottom bolts and top-left hand bolt of the carrier system. Ensure the front face of the nuts are flush with, and the waste horn projects 5/16 inch from, the finished wall.

  3. 3

    Place a level vertical against the top back nut, lining it up with the lower left back-up nut. If the wall surface is uneven, position the backup nuts to allow a 1/16-inch gap between the toilet bowl and wall.

    Wall-hung toilet installation instructions
    Level top and lower nuts (level image by Albert Lozano from Fotolia.com)
  4. 4

    Lay felt or neoprene gasket on the closet carrier system outlet. The gasket must be compressed adequately for a gas and watertight seal.

  5. 5

    Mount the toilet on carrier support using cap nuts and fibre washers with the backup nuts and washers. Ask a helper to hold the toilet bowl while you tighten the washers and cap nuts. Apply the top right fibre washer last. Tighten with a wrench making a quarter turn.

  6. 6

    Apply sealant to the space between the wall and the toilet bowl. Immediately wipe off any excess sealant with a dry cloth. It is much more difficult to clean up dried sealant later.

  7. 7

    Position a rubber gasket over the threaded outlet at the base of the tank, narrow side out, then lower the tank onto the bowl. Fasten with metal washers and nuts. Alternate tightening nuts until the tank is firmly and evenly against the bowl.

  8. 8

    Connect the water supply. Turn on the spigot and allow tank to fill. If leakage occurs, tighten the fittings.

Tips and warnings

  • To avoid breakage and injury, two people are recommended for installation.

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