Can you spread floor leveling compound on a wet surface?

In this article, we will explore this question in detail.

Understanding Floor Leveling Compound

Before we dive into the main topic, let’s first understand what floor leveling compound is and how it works. Floor leveling compound is a mixture of Portland cement and other additives such as gypsum, polymers, and aggregates. It is designed to be self-leveling, meaning it spreads and levels itself under its own weight.

The compound is typically used to fill in low spots, smooth uneven surfaces, and fix imperfections on concrete, wood, or other types of subfloors. It can be poured directly onto the subfloor and then spread and leveled using a trowel or a notched spreader.

Applying Floor Leveling Compound on a Dry Surface

Ideally, floor leveling compound should be applied on a clean, dry, and dust-free surface. Moisture can interfere with the curing process and compromise the integrity of the compound. Therefore, it is crucial to ensure that the surface is completely dry before applying the compound.

Preparing a Wet Surface for Floor Leveling Compound

If the surface you intend to level is wet or damp, it is necessary to take certain steps to ensure successful application of the floor leveling compound. Here are some important considerations:

1. Identify the Source of Moisture: Before proceeding, determine the cause of the moisture. It could be due to a plumbing leak, poor drainage, or high humidity. Fixing the source of moisture is essential to prevent future damage to the newly leveled floor.
2. Allow Sufficient Drying Time: If the surface is wet due to recent cleaning or water damage, it is crucial to allow it to dry completely. The drying time will depend on factors such as temperature, humidity, and the porosity of the subfloor material. Using fans or dehumidifiers can help expedite the drying process.
3. Test for Moisture Content: It is advisable to conduct a moisture content test to ensure the surface is dry enough for the application of the leveling compound. There are various moisture meters available that can accurately measure the moisture content in the subfloor. Consult the manufacturer’s guidelines to determine the acceptable moisture levels for the specific compound you are using.

Using a Moisture Barrier

In some cases, even after allowing ample drying time, the surface may still contain residual moisture. In such situations, it is advisable to use a moisture barrier before applying the floor leveling compound. A moisture barrier is a thin layer of material that prevents moisture from migrating into the leveling compound and affecting its performance.

There are different types of moisture barriers available, including epoxy-based coatings, moisture-resistant sealants, and specialized membranes. Choose a moisture barrier that is compatible with your chosen floor leveling compound and follow the manufacturer’s instructions for its application.

While it is generally not recommended to spread floor leveling compound on a wet surface, there are ways to address the issue and achieve a successful leveling job. Properly identifying the source of moisture, allowing sufficient drying time, conducting moisture tests, and using moisture barriers when necessary are crucial steps to ensure the longevity and performance of the floor leveling compound. Always consult the manufacturer’s guidelines and seek professional advice if unsure about the suitability of applying the compound on a wet surface.