When it comes to flooring installation or renovation projects, one common concern is dealing with an uneven or old subfloor. An uneven subfloor can cause a variety of issues, such as gaps, creaking, or even damage to the new flooring. However, a potential solution to this problem is the use of floor leveling compound. In this article, we will explore whether it is possible to apply floor leveling compound to an old subfloor and discuss the considerations you should keep in mind.
Understanding Floor Leveling Compound:
Floor leveling compound, also known as self-leveling underlayment, is a versatile solution used to create a smooth and level surface on subfloors before installing new flooring materials, such as tiles, laminate, or hardwood. It is a mixture of cement, aggregate, and additives that, when mixed with water, self-levels to eliminate low spots and create an even surface.
Checking the Condition of the Old Subfloor:
Before applying floor leveling compound to an old subfloor, it is crucial to assess the condition of the subfloor. Here are a few factors to consider:
1. Structural Integrity:
Ensure that the old subfloor is structurally sound and does not have any significant damage. Look for signs of rot, water damage, or wood decay. If the subfloor is compromised, it may need to be repaired or replaced before applying leveling compound.
2. Flatness and Evenness:
Old subfloors often have irregularities due to settling, wear and tear, or previous flooring removal. Take a straightedge or level and check for any dips, humps, or uneven areas. It is essential to address these issues before applying the leveling compound.
Preparation Steps:
Preparing the old subfloor properly lays the foundation for a successful floor leveling compound application. Here are the key steps to follow:
1. Clean the Subfloor:
Begin by removing any debris, dirt, or dust from the subfloor. A clean surface will ensure proper adhesion of the leveling compound. Use a broom, vacuum, or damp mop to clean the subfloor thoroughly.
2. Patching and Repair:
Address any significant imperfections on the subfloor, such as cracks, holes, or gaps. Fill these areas with a suitable patching compound or floor-leveling compound specifically designed for subfloor repair. Allow it to dry completely before proceeding.
3. Sealing the Subfloor:
If your old subfloor is porous, such as plywood or particleboard, it is advisable to apply a primer or sealer. This step prevents the floor leveling compound from being absorbed too quickly, leading to a weaker bond. Follow the manufacturer’s instructions for the specific sealer or primer product.
Applying Floor Leveling Compound:
Once the subfloor is prepared, you can proceed with applying the floor leveling compound:
1. Mixing the Compound:
Follow the instructions provided by the manufacturer to mix the leveling compound accurately. Typically, you will add water to the compound and mix it until you achieve a smooth and pourable consistency. Use the appropriate tools, such as a drill with a mixing paddle or a mixing container, as recommended.
2. Pouring and Spreading:
Start pouring the mixed leveling compound onto the subfloor in a small section, working your way from one end towards the other. Use a trowel or gauge rake to spread the compound evenly, ensuring it fills any low spots and levels the subfloor. Work quickly, as the compound will start to self-level and dry within a limited time frame.
3. Smoothing and Finishing:
Once the compound is spread, use a long-handled smoothing tool, such as a floor squeegee or a trowel, to further smooth and level the surface. Pay attention to any edges or corners to ensure they are properly addressed. Follow any additional instructions provided by the manufacturer, such as allowing the compound to cure or applying a second coat if necessary.Applying floor leveling compound to an old subfloor is indeed possible. However, it is crucial to assess the condition of the subfloor, perform proper preparation, and follow the manufacturer’s instructions for the leveling compound application. By taking these steps, you can create a level and smooth surface, allowing for a successful flooring installation or renovation project.