Understanding Why Self-Levelling Compounds Are Not Suitable for Laminate Floors
Applying self-levelling compounds directly over existing laminate flooring is generally not recommended. The best approach is to carefully remove the laminate entirely to reach a solid, stable subfloor before proceeding. Removing laminate flooring is straightforward because it typically clicks together without the need for glue, making DIY removal manageable. While it might seem tempting to overlay new material without removal, doing so can lead to significant issues down the line. Below, we explore the reasons why this practice is discouraged and provide insights into proper flooring preparation.
Key Reasons to Avoid Self-Levelling Over Laminate
- Movement and Stability: Laminate flooring is designed as a loose-laid system, meaning it’s not permanently fixed to the subfloor. The individual planks interlock to create a stable surface, but this system allows for slight movement. Applying a self-levelling compound over such a surface can interfere with this flexibility, potentially leading to unevenness or cracking.
- Thickness and Compression: Laminate flooring is usually installed over a thin polystyrene underlay, typically between 3-5mm thick. When additional weight, such as a self-levelling compound, is added, it can compress the underlay. This compression may cause the new layer to crack or delaminate over time, compromising the integrity of the entire floor.
- Moisture Concerns: Laminate flooring is primarily composed of MDF (Medium Density Fiberboard) at its core, with a protective plastic wear layer on top. MDF is highly susceptible to moisture damage. If moisture from the self-levelling compound seeps into the laminate, it can cause the MDF to swell, warp, or deteriorate, leading to costly repairs or replacement.
- Achieving a Level Finish: For a seamless transition between rooms or to create a uniform surface, it’s best to start with a clean, level subfloor. Installing new flooring over existing laminate often results in an uneven surface, creating an unsightly step or height difference, which can pose safety hazards.
Considerations for Overlapping Flooring Layers
While generally discouraged, some experienced DIYers or professionals might consider applying flooring over existing layers. If you’re contemplating this approach, be aware that it can be done with careful planning and the right materials, but it’s not always advisable. Ensure that the existing floor is stable, clean, and free of damage before proceeding. Remember, this is construction—there are no strict rules, only effective practices. If it works for you, then it’s the right method. Just proceed with caution and understand the potential risks involved.