How to Fix Gap between Toilet and Wall | Follow 8 Simple Steps


When you are setting up a brand new bathroom or redesigning it, one element is essential in the bathroom: the space between the wall and the toilet within the bathroom. The plumber deliberately leaves a clear gap between the walls and the toilet. If the need arises, it allows flexibility to move or install new plumbing requirements. But, how much space is enough to leave? Additionally, you shouldn’t let the hole go untreated. It is essential to fix it to prevent moisture accumulation. In the following article, we will go over how to fix gap between toilet and wall to ensure it is in good shape without water or moisture damage. In addition, you’ll get to know what space you need to leave between the wall of your bathroom and the toilet that is next to it.

Why it’s important to fix gap between toilet and wall

There are many reasons to repair gaps between the bathroom and the walls. First, it could become an ideal breeding ground for mold and bacteria if not sealed properly. In addition, if your children are small and are curious, they may put their fingers or other objects inside the gap and cause injury to themselves. Thirdly, mice and other rodents may enter your home through this entryway. Ultimately, it could cause a snafu and cause your bathroom to look dirty. If you take the time to close the gap, you will stay clear of all these potential issues.

Read how to remove toilet bowl cleaner stain on wood.

How to fix gap between toilet and wall

Nothing is worse than a gap between your bathroom or wall. It’s not easy to repair; however, with some expertise, you can have it looking as good as new in the shortest amount of time! Follow these easy steps on fixing the space between the wall and toilet to complete the task.

Step 1

Before you can repair the gap between your bathroom and the wall, it is essential to pinpoint the problem. Two significant issues can trigger this problem. The wax ring seal has gone out of date, or the bolts connecting the toilet are loose. If you’re unsure which issue you’re facing, Try wriggling the toilet in a circular motion. When the bathroom is moving, there’s likely a loose bolt. If the toilet does not roll, the issue is likely related to the seal on the wax ring.

Step 2

Next, determine the distance between your bathroom and the walls. It is recommended to use a measuring tape to get an exact measurement. Once you’ve measured, it is time to determine which method you’ll use to fill in the gap.

Step 3

Many methods fill that gap between your bathroom and the bathroom wall. One option is using caulk. The flexible sealant can be easily applied with caulk guns. Another option is expanding foam. This is a longer-lasting option. However, it may make it more challenging to install.

Step 4

If the space between your bathroom with the walls is less than 1 inch, you can apply caulk to seal it. The first step is to clean the area surrounding the gap using a putty knife or another sharp object. This will allow the caulk to stick better. Then, you can run a small amount of caulk across the entire length. Apply your finger to smooth it out, then wash away any excess.

Step 5

For more significant gaps, use expanding foam. Be sure to select an approved product safe for outdoor and indoor use because some foams are corrosive. Be sure to use gloves when working with expanding foam so that it does not come in touch with the skin.

Step 6

If the distance between your bathroom and wall exceeds 1 inch, you’ll have to purchase the toilet flange repair kit. The kit includes an extension ring as well as new nuts and bolts:

  • Remove the bolts and nuts off the flange to install it.
  • Put the extension ring on top of the flange until it is aligned with the walls.
  • Screw the new nuts and bolts in place.

Step 7

If your toilet appears unsteady and swaying, it could also create gaps between the wall and the toilet. It is necessary to ensure that the bolts are tight enough to secure the floor to the bathroom to correct this. Begin taking off the cap from the bolts. Next, using a wrench, rotate them clockwise until they’re snug. When all bolts are tight, you can replace caps and flush toilets to test for leaks. After completing the toilet and wall-filling, you’re time to try it. First, flush the toilet several times to check for any water leaks. If there’s nothing to leak and you’re done, you’re done!

Step 8

If you’re still experiencing issues regarding the distance between the bathroom and the walls or are unsure how to fix it yourself, the best option is to contact an experienced plumber. They’ll be able to identify the issue and ensure it’s repaired properly. If you’ve learned how to repair the gaps between the wall and toilet, It’s time to begin working! When using caulk, take care to clean the area that surrounds your hole before you start. Then, you’ll need to run a bit of caulk across each side of the gap and apply your fingers to smooth it.

Then, clean any excess, and you’re done! If the gap isn’t wide enough to use caulk, you could use expanding foam or a repair kit for toilet flanges. Be sure to follow the instructions with care to ensure that you don’t cause any more harm. If you’re still experiencing issues, don’t hesitate to contact the plumber.

Another way to fix gap between toilet and wall

Remove toilet

To take your toilet out, begin with disconnecting your water line. After that, flush the bathroom to drain the tank. Next, you can use a putty knife to cut the sealing around the toilet’s base. Finally, you can lift the toilet from its mounting bolts and place it aside.

Cut backer board

Cut the backer board to the desired size with a utility knife and an edge straight. After that, you can attach your backer board to the wall using screws. Make sure you countersink the screws so that they sit aligned with the surface of the backer board.

Re-Install toilet

Reinstall the toilet and ensure it is at an even level. You might need to adjust the bolts that hold it in place to do this. After you have the toilet level connect your water line and flush the toilet to look for leaks.

Caulk around the top of the toilet

If you have a gap between the toilet’s top or wall and your bathroom, caulk can be an easy solution. You just need to run a small amount of caulk around the length of the area, the space where the two surfaces come together. Use a putty knife or your fingers to smooth the caulk and create an airtight seal. Clean any caulking that is left using a damp cloth.

Re-Attach toilet seat

Connect your toilet seat back to the lid of the tank. Check that the top is in a level position on the tank. After that, tighten the bolts to ensure the tank lid is secured. After caulking is done, flush the toilet to look for leaks. If the seal is in good condition, there shouldn’t be leaks. If you find an issue with caulking, it may not be the sole cause. You might need to modify the toilet or the bolts for mounting.

How to fix a big gap under a toilet

There are many options to close a massive gap under the toilet. The first option is to use caulk. Caulk is a flexible sealant that fills in cracks and crevices. If the gap isn’t too big, there’s a possibility to make use of the caulk tube. For more significant gaps, you’ll have to employ a caulking gun. Another option is expanding foam. It is fast-drying and forms a firm seal. It is ideal for filling in significant gaps and spaces.

You can also employ putty. It is a soft material that could be utilized to plug holes and cracks. When it is dried, it turns complex and robust. No matter which method you select, Ensure the area is dry and clean before starting. Fill the gap first and let it dry completely before you can use the toilet. Read on for more details on repairing the gap between the wall and the bathroom.


If you install an entirely new toilet or redesign your bathroom space, the distance between your wall and the adjacent toilet can be a big issue. There should be a minimal gap between the bathroom and the toilet wall to allow for various moving and additional plumbing installations. However, if a gap between your toilet and its adjoining wall is too large, there is room for moisture to soak into the border faster than you anticipate.


The average gap between your toilet and an adjoining toilet is not more than 16 inches. However, if the distance between the wall and the bathroom is excessive, it must be repaired to ensure that the wall and toilet remain in good order. In this context, the following guideline on fixing gaps between the wall and toilet could be helpful to you. It is possible to use an offset toilet faucet or redirect the drain pipe for waste to close the gap precisely and swiftly.

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