How to Install a Toilet With an Uneven Flange

The flange (also known as a "closet flange") is the piece of plumbing connecting a toilet to a home's sewer system. It has bolts that poke up through the bottom of the toilet to hold it securely in place. A toilet flange can become uneven, making toilet installation a challenge. There are simple solutions to make installation possible.

You can install a toilet on an uneven flange.

Step 1

Open the wax ring packages and allow rings to come to room temperature.

Step 2

Ensure that the flange is in usable condition. Although you can install a toilet on an uneven flange, you can't install one on a flange that is rusted and corroded. Tap gently around the flange with a hammer to make sure it can withstand the weight of the toilet.

Step 3

Slip the flange bolts, threads up, into the sockets on the flange.

Step 4

Press the first wax ring onto the toilet flange. Cut out a portion of the second wax ring if needed to make up for the uneven flange. Press this into the first wax ring.

Step 5

Invert the toilet bowl so that the sewer connection is facing upwards. Place a thin bead of plumber's putty around the edges of the bottom of the bowl.

Step 6

Turn the bowl right-side up and maneuver it over the flange opening. You might need assistance with this part. Lower the toilet bowl on the flange so that the sewer connection at the bottom of the bowl aligns with the wax rings. At the same time, you need to make sure that the flange bolts poke up through the holes in the base of the toilet.

Step 7

Bring the bowl level with toilet wedges, thin pieces of plastic that you can slip in under the bottom of the toilet to bring it level. Place a spirit level on the bowl of the toilet to check as you work.

Step 8

Slip the plastic and metal washers over the flange bolts. Thread the flange nuts over the bolts, tightening them hand-tight. Tighten the nut one turn on one side with the wrench, do another turn on the other side. Do this until the toilet is secure. Trim off any portions of the wedges that poke out with a sharp knife.

Step 9

Set the tank on the back of the toilet. Drop the tank bolts through the bottom of the tank and the back of the toilet bowl. Secure from below with the tank bolt nuts.

Step 10

Connect the water supply hose to the inlet on the bottom of the tank. Turn on the water and allow the toilet to fill.

Step 11

Flush the toilet. Check for leaks. Tighten any fittings if necessary.