How do you install a toilet in a new construction home?

You can install a new toilet as part of a home addition or rehab.

  1. Cut the soil stack with a hacksaw if necessary so it is even with the finished surface of the floor.
  2. Place the closet flange onto the drainpipe.
  3. Remove the closet flange.
  4. Fasten the closet flange to the floor with stainless steel screws.

Should toilet flange be on subfloor or finished floor?

The toilet flange needs to be on top of the finished floor. Meaning the bottom edge of the flange needs to be on the same plane as the toilet. if you have it lower than the finished floor you risk leaking toilet water (the water is the best part) into the floor or worse, in-between the tile, sub-floor, backer board.

Does toilet flange go inside or outside pipe?

This toilet flange is designed to glue on the inside of the pipe or expand inside the pipe. Leave the old toilet flange right in place and glue on the new one at the right elevation for the floor, if it’s plastic. The flange should be sitting with the bottom edge flush with the top of the floor.

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Does a toilet flange need to be glued?

This toilet flange is designed to glue on the inside of the pipe or expand inside the pipe. The bottom of the flange needs to be sitting flush with (or not more than 1/8″ above) the finished floor or else the toilet will rock. The flange should be fastened to the floor. Dry fit the toilet to make sure it doesn’t rock.

Can toilet flange be lower than floor?

In a typical toilet installation, the floor flange that sits inside the drain opening below the toilet should be positioned so that its bottom surface rests flush against the finished floor, or no more than 1/4 inch above or below the floor.

Should the toilet flange be flush with the tile?

The bottom of the flange must be flush with the tile, no gaps, or it could end up too high. You don’t want a large wax depth from having it too low and if it is too high, the toilet will rock. The seal is engineered to work best with the flange on top of the finished floor.

How high should the toilet flange be above the floor?

Optimum flange height to aim for is 1/4 inch above the finished floor. This typically allows for almost any type of wax ring to be used and still ensure a good seal.

How do you anchor a toilet flange to concrete?


  1. Cut off the Old Flange and Obstructions. After you remove the toilet, you will probably find an existing toilet flange.
  2. Scrape Off the Old Wax Ring.
  3. Place T-Bolts in the New Toilet Flange.
  4. Position the Toilet Flange.
  5. Drill Holes Into the Concrete.
  6. Screw the Toilet Flange Onto the Concrete.
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How long should toilet flange screws be?

You will want to go with a longer set of screws. 1 1/2 inch screws or longer is usually a safer bet if you are screwing into thicker boards. If the board is more shallow, then 1-inch screws will probably do the job for you.

Should you caulk around a toilet?

Caulk helps to keep the toilet secured to the floor. The bolts are really supposed to keep the toilet secure, but caulk helps. Some people prefer to caulk all around the toilet and leave about a one -inch gap in the caulk at the back of the toilet to allow water to escape out in the event of a leak.

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