Self-levelling compound: definition and use
+ Definition
A fine, free-flowing mortar applied in a thin layer to correct the flatness of a substrate before the floor covering is laid.
A fine, free-flowing mortar applied in a thin layer to correct the flatness of a substrate before the floor covering is laid.
A self-levelling compound is a fine mortar applied in a thin layer over an existing substrate to correct its flatness. Poured as a liquid and spread with a trowel, it finds its own level and hardens within a few hours.
Its role is corrective, never load-bearing. It makes good surface defects of a few millimetres; it does not create the layer on which the floor covering rests.
In practice these terms describe the same family of products, and trade usage treats them as interchangeable. In French-speaking Belgium the brand name egaline has entered everyday site language in the same way.
The useful distinction is therefore not between these words, but between them and the screed. A levelling compound corrects, a screed constitutes. The first is measured in millimetres, the second in centimetres.
From a few millimetres up to around one centimetre depending on the product. Beyond that you leave its field of use: the product becomes expensive per square metre and its shrinkage behaviour is no longer controlled at those thicknesses.
That is the tipping point towards a screed. Below 3 cm in bonded form you are no longer dealing with a screed; above one centimetre you are no longer dealing with a levelling compound. In between sit intermediate products formulated for that range.
A sound, clean, cohesive and dust-free substrate. That is the non-negotiable condition, and it is also the most common cause of failure: applied over a friable or greasy surface, the compound bonds to a layer that does not itself hold, and the whole lot lifts.
A primer matched to the substrate is almost always required. On a closed or very smooth surface, existing tiles for example, a specific bonding primer is needed and sometimes mechanical preparation as well.
No. A levelling compound carries no load, it incorporates no insulation, it allows neither acoustic decoupling nor the encasing of underfloor heating. All it does is prepare a surface that already exists.
When the floor has to gain height, take insulation or embed pipes, a screed is required. See our screed laying services.
Feel free to contact us directly: our team is always available to assist you and provide a 100% free quote.
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