The types of screeds are divided according to the composition of the materials which they are made from, the base on which they are placed and the method of application.
Types of materials
- Calcium sulphate screeds (anhydrite) – they are applied with screed pumps and this is done quickly and without joints, even on larger areas. This type of screed is self-leveling. Anhydrite screeds are also called calcium sulphate screeds because calcium sulphate is the main binder material in them. They are prepared by mixing gypsum, sand and water together. The hardened calcium sulfate can absorb the available moisture over time and thus lose its strength. For this reason, this type of screed must be well protected from moisture.
- Cement-based screeds – this is the most commonly used screed. It is prepared from mixing sand, gravel, cement and water together. This group also includes the so-called quick screeds, in which the water is chemically bound for a few seconds.
- Magnesium screed – it is placed in rooms where no flooring will be laid, and the screed will be used for flooring. It is used mainly in industrial construction.
- Asphalt screed – this is the only type of screed that is prepared without water. Due to this quality, asphalt screed is suitable for installation on trimmer joists and is often used in the renovation of old buildings. Since asphalt is a plastic material, it can react to pressure from heavier furniture and be deformed.
Types of bases
- Ceramic tiles – terracotta, stoneware
- Granite tiles
- Natural and laminated parquet
- PVC coating
- Linoleum, carpet, etc.
Ways of applying
- Traditional screed – it is suitable for all rooms. It is difficult to achieve the required flatness with larger floor areas.
- Self-levelling mixtures – it is known under different names, such as self-levelling mixtures, self-levelling compounds, self-levelling screeds and others. These type of screeds are used for smoothing and levelling the base and are characterized by high ductility, good viscosity and shorter curing time. Dissolved in water, such mixtures flow freely under the influence of their own weight, filling all hollows/holes and creating a flat and strong surface. Modern self-levelling products possess the qualities of traditional screeds, but also have a number of other advantages. They dry much faster – usually in a few days’ time. The fillers used in them are of much smaller fractions and thus much smoother surfaces are obtained, which is difficult to achieve with ordinary screeds.
Place of application
- Interior and exterior
- For floors of public, residential, industrial buildings