Alpha SL 2-20

Alpha SL Underlayment 2–20mm

Alpha SL Underlayment 2–20mm is a high-performance, gypsum-based self-levelling compound designed for accurate indoor floor levelling. It is ideal for sound calcium sulphate substrates such as anhydrite screeds and alpha semi-hydrate floors, applied in thicknesses from 2mm up to 20mm.

This smoothing underlayment delivers a flat, even surface quickly and efficiently. Thanks to its fast-setting formulation, it reduces downtime on site while maintaining excellent dimensional stability. The material is self-levelling, shrink-resistant and stress-resistant, making it suitable for professional flooring projects where consistency and reliability matter.

Alpha SL Underlayment 2–20mm can be safely applied over professionally installed underfloor heating systems, provided the correct heating protocols are followed before commissioning. Its pumpable consistency allows for fast installation on larger areas, and once cured, the surface can be easily sanded to achieve a flawless finish.

This gypsum-based levelling compound is intended for indoor use only and must always be finished with a suitable floor covering such as tiles, carpet or parquet. It is not suitable for wooden substrates, industrial environments, or areas exposed to constant moisture or humidity, including bathrooms and outdoor spaces.

A dependable choice for creating smooth, level indoor floors ready for final finishes, Alpha SL Underlayment 2–20mm supports efficient installation and high-quality results.