How to Install a Floor Mount for a Toilet

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A floor mount for a toilet is more commonly called a toilet flange. The toilet is bolted directly to the flange to provide a tight fit between the toilet and the floor. The water seal between the toilet and the flange is created by a wax ring. If the flange is installed incorrectly or too high, the toilet will not fit tightly to the floor. It will be allowed to rock back and forth and side to side. Such movements will break the wax ring seal between the toilet and the flange and the toilet will leak every time you flush.

Things You'll Need

  • Dry cloth rag
  • Drain pipe adhesive
  • Toilet flange
  • Drywall screws
  • Rough in the drain pipe for the toilet according to local and national code requirements. Be sure the toilet drain pipe is adequately ventilated to allow for proper drainage. Be sure the opening of the drain pipe that will accept the toilet flange sits below the surface of the subfloor.

  • Wipe any dirt off of the drain pipe with a dry cloth rag so the adhesive will bond the pipe and the flange effectively. Coat either the inner surface or the outer surface of the drain pipe (depending on the flange style) with adhesive. Coat the corresponding surface of the toilet flange with adhesive also.

  • Press the toilet flange onto the drain pipe and twist the flange so that the toilet bolt notches sit parallel to the wall. If the toilet bolt holes are in the wring position, the toilet cannot be installed correctly. Screw the flange into the subfloor with drywall screws.

  • Allow the adhesive to bond the flange to the pipe for at least ½ hour before installing the toilet.

Tips & Warnings

  • The adhesive that you use to glue the drainpipe to the flange depends on the kind of pipe being used. ABS (Acrylonitrile-Butadiene-Styrene, or black drain pipe) adhesive is different than PVC (Polyvinyl Chloride, or white drain pipe) adhesive. To glue ABS and PVC together, use transition adhesive.

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