What if toilet flange sits too high on concrete floor?

Author: Shyann Abbott  |  Last update: Sunday, May 3, 2026

A toilet flange that's too high can cause instability, as the toilet won't sit evenly on the floor. This can lead to an uneven seating experience, as well as increased wear on the wax ring.

What to do if my toilet flange is too high?

You can adjust the depth of the flange by using PVC extensions. If your breaking out the old one try and find a flange that goes inside your old pipe not around it. If it goes around it you will have a problem.

Is it okay if the toilet flange is higher than the floor?

the flange should be installed on the top of the finished floor (tile, vinyl, wood). as far as acceptable range, too high by even a little bit will prevent the toilet from setting on the floor (it will rock). the lower the flange, the thicker your wax ring or rings will need to be.

Should toilet flange be screwed to concrete floor?

The flange should be fastened to the floor. Dry fit the toilet to make sure it doesn't rock. If it does rock, use shims to prevent rocking - just tightening the bolts probably will not stop the rocking but will risk cracking the toilet or breaking the flange.

What is the height of a toilet flange on concrete?

What Is the Correct Height for a Toilet Flange? The correct height for a toilet flange is about 1/4 inch above the floor, which should be finished. Always install the floor before the toilet flange, making sure it is level to prevent leaks or a rocking base.

Fix toilet flange that is TOO HIGH

How to screw into cement?

To install a screw into concrete all you have to do is drill a hole in the concrete, clean out the hole and drive in the screw, no hammering required! Concrete screws are an excellent option when looking to fasten close to an edge, as there is no expansion and pressure on the base material is reduced.

What is a toilet flange extender?

It's an a Push Tite gasketed closet flange. Simply push this down into the old closet flange and secure it to the wood subfloor with galvanized or stainless steel screws.

Should you caulk around a toilet?

Reasons to Caulk Around a Toilet

Moisture Prevention: Without caulk around the toilet base, external water can seep under the toilet, leading to floor and subfloor damage over time. This is especially important in bathrooms with wooden floors, as prolonged exposure to moisture can lead to rot and structural issues.

Do you put the wax ring on the toilet or the flange?

Position the new toilet wax ring on top of the toilet flange, ensuring it is centered. Want to know more about choosing the correct wax ring size, crucial installation tips, and other frequently asked questions? Check out our Oatey 101: Wax Rings blog.

What holds toilet flange to floor?

T bolts, or as Oatey calls them, "Johni-Bolts," are used to connect the toilet (via slots) to the toilet flange.

Is my toilet too high?

Understanding Toilet Heights

Toilets will generally range from about 14-1/2 inches to 21 inches high. Most toilets do not exceed 19 inches high. Standard height and comfort height toilets tend to have a 2- to 3-inch height difference. A third and less common toilet called a tall height toilet is 19 inches high.

Is it OK if toilet flange is higher than floor?

Pay attention to flange height

Proper flange height is key to preventing leak paths. A best practice is to install the toilet flange on top of the finished floor.

How to fix a wobbly toilet on concrete floor?

If the toilet wobbles, it probably needs to be pulled up and have a new seal put in. Then, shim it, grout it, or silicone caulk it so it doesn't wobble. If it wobbles, it will probably lose its seal and leak around the floor. Countless floors rot because of small toilet leaks.

Why is my toilet not sitting flat on the floor?

Toilets usually rock because they are not resting flush against the floor. Underneath the toilet base is a round toilet flange that connects the toilet to the drain pipe. If the flange is a little higher than the surrounding flooring, the toilet becomes raised slightly in the center, allowing it to rock to either side.

How to replace a toilet flange in a concrete floor?

How To Install a New Toilet Flange on a Concrete Slab
  1. Cut off the Old Flange and Obstructions. ...
  2. Scrape off Old Wax Ring. ...
  3. Pick the Correct New Toilet Flange. ...
  4. Place T-Bolts in New Toilet Flange. ...
  5. Position Toilet Flange. ...
  6. Drill Holes Into Concrete. ...
  7. Screw Toilet Flange Onto Concrete.

How do you know if you need a toilet flange extender?

Signs you need a toilet flange extender

First up, inspect for water leaks. A low flange lets water trickle out, causing puddles around your toilet's base. That can jeopardize your property's integrity, which leads us to the next clue: soft or saggy flooring near the toilet.

Can I stack toilet flange spacers?

A: Yes, you can stack (no more than 3). We recommend you put a bead of 100% silicone between each layer.

How do you know if your toilet flange is bad?

In addition to your toilet rocking, there are other warning signs that may indicate your flange is broken including:
  • Visible leaks beneath the toilet.
  • Flooring surrounding the toilet feels soft.
  • Water spots appearing on the ceiling located directly below the toilet.

How to fix a gap between a toilet and a wall?

Toilet tank braces can be adjusted to fit the gap between your tank and wall. Clipped on back edge of tank, under lid, braces are practically invisible when installed. Anchor your tanks with Secure-A-Tank to protect against costly leaks and repairs.

Are there screws that go directly into concrete?

Just like a wood screw is to wood, concrete screws provide a quick and easy way to fasten to concrete whilst providing strong load values. They are an easy method of installation as they are directly screwed into the concrete and unlike other traditional installation methods, you do not have to do any hammering!

Do I need to pre-drill for concrete screws?

Pre-drilling for concrete nails is generally recommended to prevent cracking and ensure accuracy.

How do you get a screw to stay in concrete?

To fasten to concrete, you must:
  1. Drill a pilot hole, unless the screw can go in without one. The hole should be at least 1/4-in. deeper than the screw length.
  2. Drive the fastener into the hole with a drill or other driving tool.
  3. Be sure the fastener is snug against the concrete and doesn't wiggle.

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