Common problems with floor leveling and how to fix them :Floor leveling is a vital step in any flooring process, and it needs to be done correctly to ensure a smooth and even surface after finishing the flooring project. However, some common problems with flooring leveling affect the whole process and the final appearance of the floored space. In this article, some of the most common floor leveling issues and solutions will be explained.
1. Uneven subfloor
An uneven subfloor is one of the most frequent problems during the flooring installation. Whether the flooring type is wood or concrete, uneven floors can cause problems throughout the project, leading to cracks, gaps, and wear.
To fix uneven floors:
- For wood subfloors, you can sand down the bumped spots and also use plywood and shims to fill in the empty and low areas of the floor.
- For concrete floors, you can use a self-leveling compound to level the surface. Make sure that you have already cleaned the surface before using any compound to ensure the right adhesion.
💡You can also read more about:
- Floor leveling using plywood
- Flooring leveling using shims
2. Cracks in concrete subfloors
Cracks in concrete subfloors are also a common issue that mostly happens in older places. This problem can cause moisture seeping which later leads to mold and damage to your final flooring.
To fix cracks in concrete subfloors:
- Fill the cracks using epoxy-based crack fillers to make the floor stable and prevent the cracks spread through the whole floor.
- After filling the cracks and letting them dry, use a self-leveling compound to even and smooth the surface. If there are deeper cracks, you can also use cement-based compounds to fill cracks.
3. Dips or low spots in the subfloor
The next frequent problem in subfloors is dips or low spots. This issue, which leads to uneven, unstable, and sagging floors, can cause issues in tile and laminate flooring installation.
To fix dips or low spots in subfloors:
- If the dips and low spots are small, you can use a thin layer of self-leveling compound or floor leveling pad to smooth the floor.
- If the problem is deeper, you can use a thicker layer of self-leveling compound. You need to let it rest and dry before continuing the flooring installation.
3. High spots in the subfloor
High spots in the subfloors are another common problem in flooring installation projects. This issue, which mostly happens in wood subfloors, can prevent the whole process from being finished correctly as it can cause significant uneven spots on the floor.
To fix high spots issues in subfloors:
- If there are concrete high spots, you can use a concrete grind to reduce the high spots and continue it until an even surface.
- If there are high spots on the wood subfloors, you can sand the high spots to reduce the height of them.
💡It is crucial to always check everything that can cause high spots in the subfloors such as joist problems.
4. Moisture problems in subfloors
Moisture is one of the common problems in subfloors, especially concrete floors, which leads to cracks, mold, and adhesive issues when installing some types of flooring like laminate or vinyl flooring.
To fix moisture issues in subfloors:
- To start, you need to measure the level of moisture using a moisture meter. If the level of moisture is high, try to install vapor barriers or use a moisture-resistant leveling compound.
- Make sure there is suitable ventilation in places such as the kitchen, bathroom, and basement that are exposed to moisture problems. Using dehumidifiers can also help reduce the level of moisture in the mentioned places before floor leveling.
5. Inconsistent application of leveling compound
Another frequent problem when leveling the floors yourself is the inconsistent application of the leveling compound that leads to low or high spots. This process can be challenging when trying to create a smooth surface and certainly needs enough experience to be done problem-free.
However, there are still solutions to resolve the inconsistent leveling compound application:
- Follow the self-leveling compound manufacturer instructions to mix the compound correctly.
- Try to use a spiked roller to spread the leveling compound evenly. To start leveling, you can apply the leveling compound from one side of the room and then immediately use the roller to spread it fast. Make sure you cover all low spots.
- Try to divide large spaces into sections to have enough time to spread the self-leveling compound without any rush as it spreads and gets dried quickly.
- Asking for help from flooring professionals is the safest way to make sure everything in floor leveling goes well.
6. Subfloor deflection or movement
Subfloor deflection or movement is the issue in floor leveling that can cause cracks in tiles, instability, and gaps in floorboards. This mainly happens in old places where there are joist problems.
To fix subfloor movement or deflection:
- Inspect the joists in the wooden subfloors to see which joist(s) caused the issue. Improving the joist structure by adding extra joists (joist sistering) can help reduce this problem. You can also use plywood to fasten the subfloor and reduce deflection.
- If the joist issue is big and cannot be treated by the mentioned solution, you may need to rebuild that portion(s) of the subfloor to have a stable floor.
7. Bonding issues between floor levels
Bonding problem between old subfloor and leveling compound is another possible and common issue that happens due the wrong subfloor preparation before applying the leveling compound. This problem can cause cracking, shifting, and peeling over time.
To fix the bonding issue between floor levels:
- Before applying a self-leveling compound on the old subfloor, ensure that you have already cleaned and removed dirt, dust, and grease, and everywhere is dry.
- Try to use a suitable floor primer that is compatible with your subfloor material to improve adhesion.
- In case of a bonding issue, you need to remove the damaged section, remove it, and apply the compound again.
Floor leveling is a critical part of any flooring installation, ensuring that the final surface is smooth, even, and durable. While the process seems straightforward, a variety of issues can arise during floor leveling that may lead to an unsatisfactory result if not addressed properly. Understanding these common problems and knowing how to fix them can save time, effort, and money, while also helping to avoid costly mistakes. In this extended discussion, we’ll delve into some additional floor leveling issues and provide a more comprehensive guide.
1. Incorrect Thickness of Leveling Compound
One problem that can occur during the floor leveling process is applying the incorrect thickness of the leveling compound. If the compound is applied too thinly, it may not effectively level the floor, leading to uneven areas or low spots that can affect the appearance and durability of the floor. On the other hand, applying the compound too thickly may lead to cracking and uneven drying, which could affect the floor’s structural integrity.
2. Poor Ventilation During the Drying Process
Proper ventilation is crucial when leveling floors, especially when using compounds that require drying time. Without sufficient airflow, the leveling compound may take longer to cure, potentially causing it to remain soft, sticky, or uneven. In extreme cases, lack of ventilation can also lead to the formation of moisture pockets beneath the compound, which could compromise the bond with the subfloor.
3. Subfloor Contamination
Subfloors often accumulate dust, dirt, oil, grease, and other contaminants that can interfere with the adhesion of leveling compounds. When contaminants are left on the subfloor, they can cause the compound to bond poorly, leading to lifting or cracking over time.
4. Over-saturation of Self-Leveling Compound
When using a self-leveling compound, it’s easy to get over-saturated by applying too much liquid, thinking it will help level the surface better. However, over-saturating the compound can lead to bubbles or streaks in the surface, creating an uneven finish that is difficult to fix.
5. Failure to Plan for Floor Expansion
Flooring materials, especially hardwood, laminate, and vinyl, tend to expand and contract with changes in temperature and humidity. When leveling a floor, it’s important to leave room for expansion, as the floor will naturally move over time. Failure to consider this can lead to unsightly gaps between floorboards or buckling in areas of the flooring installation.
6. Uneven Floor Transitions
When transitioning from one type of flooring to another—say from tile to carpet or from vinyl to wood—an uneven floor can result in a visible gap or lip that creates an unsightly transition. This problem is particularly common if the subfloor isn’t adequately leveled or if the flooring materials have different thicknesses.
7. Not Allowing Sufficient Drying Time
A common mistake during floor leveling is not allowing the leveling compound to fully dry before proceeding with the flooring installation. Rushing this step can cause the compound to remain soft, leading to issues with the flooring bonding or adhering correctly. Premature installation can also result in an unstable floor, which may start to sag or shift.
Conclusion
Floor leveling is one of the basic and essential steps in flooring projects which should be done carefully and correctly to prevent any problem in subfloors and have a smooth final finish. However, there are more frequent issues in the floor leveling process than may happen due to old buildings’ structures, moisture, or even lack of experience in performing the floor leveling. Therefore, it is highly recommended to consult with flooring experts to avoid every possible problem that can cost you money, time, and energy. MA Flooring, the floor leveling service provider in Melbourne, delivers the latest methods in the flooring field and provides its clients with effective solutions in the floor leveling process.