On the shelf, many bags of self-levelling compound look alike. Yet levelling mortars differ in subfloor, layer thickness, drying time, and application. The right choice therefore doesn't start with the brand, but with the floor you're going to work on.
Self-levelling compound is a general term
By self-levelling compound, we generally mean a levelling mortar used to make a floor flat and smooth. There are different formulations and specialised products for, for example, thicker layers, fast application, or movement-sensitive subfloors.
What subfloor do you have?
First determine whether you're working on concrete, sand-cement, anhydrite, tile, wood, or an existing levelling layer. Not every product is intended for every subfloor.
Self-levelling compound for concrete and sand-cement
For mineral cement-based subfloors, there's plenty of choice. Don't just look at the text "suitable for concrete" — also check layer thickness, drying time, primer, and suitability for the final flooring.
Self-levelling compound for anhydrite
Anhydrite requires a system suitable for this purpose. Check both the compound and the primer. Don't automatically assume the same product combination you'd use on sand-cement.
Self-levelling compound for tile
With a dense tiled floor, adhesion is important. The tiles need to be stable and clean. Then choose a system suitable for a low-absorbency subfloor.
Self-levelling compound for wood
Wood can move. Depending on the floor build-up, a fibre-reinforced or other purpose-built system may be needed. The structure must first be sufficiently stable.
How thick should you level?
The required layer thickness determines the product choice. Some compounds are mainly intended for thin layers, while others can be applied thicker within their specifications. Check the minimum and maximum layer thickness.
Which final flooring goes on top?
For adhesive-bonded vinyl, you want a very flat and smooth surface. Other floor build-ups may have different requirements. So look at the complete system, from subfloor to final flooring.
Fast-drying isn't automatically better
A short drying time is convenient, but only if the product is also technically suited to the subfloor and floor finish. Speed only matters once suitability is confirmed.
How to choose more precisely
-
Determine the subfloor.
-
Measure the height differences and required layer thickness.
-
Determine which final flooring will be laid.
-
Check whether underfloor heating is present.
-
Choose primer and self-levelling compound that match each other according to the system.
With that information, you can choose a levelling product that truly fits the job.