How To Correct Slope in Bathroom Floor?

House maintenance is often a tricky task. Sometimes you feel hard to keep up, from the walls to the floor. What if you discover a slope in your bathroom floor? How can you make things better?

Whether there are slopes in certain spots of your bathroom floor or it is entirely uneven, finding the root of the problem is the first approach to leveling a floor.

You’ll need to determine the reason and assess your repair alternatives based on the bathroom’s location, structure, moisture content, and possible insect infestation. We have compiled the solutions for you if you are looking to remedy an uneven bathroom floor.

How to Correct Slope in Bathroom Floors?

The possible options to correct the slope of the bathroom floor are as follows:

  • A self-leveling substance
  • Completely replace the subfloor
  • Putting up floor underlay
  • To support the subfloor and joists, install shims.

You could have additional questions now that you are aware of what to do next. What might have possibly led to the floor being uneven? Can the possibilities be well explained? Keep diving in depth to acquire a comprehensive analysis of the problem.

What Exactly are Uneven Floors?

The term “uneven flooring” accurately describes them. They are floors with bumpy surfaces caused by sagging and slopes. However, problems are rarely brought on by the flooring themselves.

The walls and floors of a home may move and flex when its foundation becomes unstable. They could even crack in more severe circumstances. However, something altogether different than a settling house might be the real issue.

Guidelines for Identifying an Uneven Bathroom Floor

Identifying an Uneven Bathroom Floor

You must know certain ways to identify the slopes in your bathroom floor before trying any way to get things done.

There may be inclines or sections that are higher or lower than others. How do you determine which areas of the floor are level, then? You may identify the portions of the bathroom floor that are uneven by using the three techniques listed below.

1- Laser Light Pointer Method

This approach is easy. A laser light pointer is required. Turn on the light and place it straight on the floor from one side. Now check to see whether the light goes over to the wall of the bathroom on the opposite side. It is level if the answer is yes.

The bathroom floor has irregularities if the laser light interrupts and strikes the ground, unfortunately. To check the entire space, now slide the laser light pointer diagonally over the bathroom floor.

2- Marble Method

As the name implies, marbles are used in this technique. Find yourself some marbles and scatter them on the bathroom floor. Now watch and observe how they move and in what direction they go.

The section is lower than the rest of the bathroom floor if the marble constantly slides down in the same direction. Similarly, if the marble comes to a halt at a certain location after rolling down, it reveals a slope on the bathroom floor.

3- Carpenter’s Level Method

The simplest approach to check whether the bathroom floor is level is by using a carpenter’s level, by far.

A carpenter’s level is a device used in woodworking; get one and set it down on the ground. The floor is level if the bubble in the leveling tool remains precisely in the middle. But if the bubble tilts to either side of the level, the bathroom surface isn’t level.

What Makes a Bathroom Floor Uneven?

The causes of uneven or sinking bathroom flooring are several. It could be brought on by a foundation issue. Crawl space problems are another reason sometimes.

uneven floor in bathroom

We have included the indicators that will allow you to identify the reason for an uneven bathroom floor because there is no conclusive solution. If the floor is uneven because of a foundation problem, you could see indicators like:

  • Blocked doors
  • Floor splits
  • The center of the floor is drooping.
  • The crawl space has fungus or mold.

1- Crawl Space

Gaps between doors, walls, or the floor below may be a clue that the crawl space is to blame for the unevenness of the bathroom floor. Additionally, a stuck door and inner wall breaches suggest a problem with the crawl space.

2- Sub-Flooring 

If you see any uneven areas, your subfloor could be the issue. The plywood that was utilized for the subfloor may be weak or protruding. Weak or expanding plywood results in damaged or uneven spots on the floor.

3- Joists

The most frequent reason for uneven flooring is joists. Joists may sink over time as a result of a poor support structure. Similarly, joists may eventually begin rising if they come into regular water exposure.

Options for Floor Leveling

Options for Floor Leveling

Now that you know what causes slopes in bathroom floors, you need to think about your alternatives for each scenario.

1- Minor floor irregularities

What if your unevenness is only slightly present? Do you need to think about your alternatives? Thankfully, no. You might think about simple fixes like installing floor underlayment to eliminate small flaws. Alternatively, you might cover particular regions of tiles with extra sealant.

2- Joists and subfloors

There are two ways to correct uneven flooring brought on by the subfloor and joists. If there is significant damage, you can replace the subfloor yourself. However, you may also hire a specialist to complete the task for you.

Use self-leveling chemicals to solve the problem if you decide to do it yourself. As an alternative, you can choose to level the flooring by inserting fittings between the joists and subflooring.

You’ll probably need to remove the current plywood and replace it if there are any subfloor problems. You must safeguard it if it is undamaged. Although hiring a professional will cost more money, there is a greater assurance that they will be able to resolve the issue.

3- Crawl Space

The only way to fix issues with foundations and crawl spaces is to employ a specialist. Professionals will evaluate the condition and follow the right procedures to fix the foundation unless you constructed the house yourself.

Although you might feel compelled to do it yourself, you should use prudence. Inadequate procedure adherence might endanger the foundation’s structural stability. You don’t want to spend money on unnecessary repairs.


Slopes in bathroom floors shouldn’t be left unnoticed, whether you already own a house or planning to purchase one.

Floors that are sinking, sloping, or buckling are an indication of a much larger issue that might lead to major problems in the future. Your home won’t fall apart and you’ll save some bucks if you fix the issue quickly.

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