Understanding the Risks of Applying Self-Levelling Compound on Laminate Floors
Applying self-levelling compound directly over laminate flooring is strongly discouraged. Instead, it’s best to carefully remove the existing laminate to reveal a solid and stable subfloor beneath. Laminate flooring is designed for easy DIY removal, as it typically clicks together without the need for adhesives. Removing it yourself is straightforward and can save time and money, provided you do it correctly. If you’re unsure about the process or reasons, read on below for detailed explanations.
Why You Should Avoid Self-Levelling Over Laminate
- Loose-laid Construction: Laminate flooring is installed as a floating floor, meaning it’s not fixed to the subfloor with nails or glue. The interlocking planks rely on their weight and click-together design to stay in place. Applying a self-levelling compound on top can introduce movement and instability, risking future damage.
- Impact on Underlay and Stability: Typically, laminate flooring rests on a thin layer of polystyrene underlay, usually between 3-5mm thick. When a self-levelling compound is added, it can compress the underlay, leading to unevenness or cracking of the compound over time. This can compromise the integrity of the entire floor structure.
- Moisture Sensitivity and Damage: Laminate floors contain MDF (medium-density fiberboard) at their core. MDF is highly susceptible to moisture. If water or any liquid seeps into the laminate, it can cause the material to swell, warp, or blow out, which is a common problem with over-mopped or water-sensitive floors.
- Achieving a Flush Finish: For aesthetic and practical reasons, it’s preferable for your new floor to be as low as possible, creating a seamless transition between rooms. Installing over existing laminate can result in uneven heights or steps, which are both undesirable and potentially hazardous. Removing the laminate ensures a flat, even surface suitable for new flooring.
Considering Overlapping Flooring Layers
While generally not recommended, some adventurous DIYers may contemplate applying new flooring over existing layers, including laminate. If you’re determined to proceed despite the risks, it’s essential to understand that there are no strict rules in construction—sometimes unconventional methods work. However, always weigh the potential long-term issues versus immediate convenience. If you choose to go down this path, ensure you accept the possibility of future complications and plan accordingly.
In summary, removing laminate flooring before applying self-levelling compounds is the safest, most reliable method to ensure a durable and level surface. Remember, in construction, there’s no one-size-fits-all approach—what matters most is that your method results in a safe, stable, and visually appealing finish.