Sand screed - how it works

Carpet, linoleum, laminate, parquet or tiles? Floor coverings determine the room atmosphere significantly. If you want to lay a floor covering, you need a level, clean surface: the screed. For the different floor coverings, however, this must be ground or sanded down. In modern living design, the screed is also increasingly used as an independent floor covering, which not only looks contemporary, but is also very hard-wearing.

Screed types

Different types of screed are available in the trade, not only in color, but also in their application differ. This is due to the different raw materials and binders used.

Cement screed

The most common screed is probably the cement screed. This screed is particularly resistant, moisture-resistant and robust and therefore very popular. However, when laying something can be done wrong. During curing, the soil contracts strongly during the long drying process. Cracks may result.

Calcium sulfate screed

Calcium sulfate screed, also marketed under the name Anhydritestrich, is a fine soil based on stones with a grain size of about eight millimeters and calcium sulfate as a binder. The floor is suitable for laying underfloor heating, but it is sensitive to moisture if it is not coated.

Mastic asphalt screed

Mastic asphalt screed is quite resistant to moisture and consists of rock powder, grit, sand and bitumen. By sanding, an elegant sheen can be achieved.

Resin screed

Synthetic resin screed is enriched with plastics such as epoxy resin to make it more resistant. Correctly coated, this screed floor can also be used as a final floor covering.

Synthetic resin screed can be dyed as desired to achieve special effects.

Magnesia screed

Magnesia screed can also be dyed. However, the caustic magnesia soil is very sensitive to moisture. The solution of magnesium chloride and organic material, such as sawdust, wood shavings, textile, paper or rubber fibers is mixed with quartz sand or flour for more resistance.

Screed as floor covering

Traditionally screed is only used as underfloor. The poured stone floor has great potential in the home design. The screed is a special mortar that is poured and hardens over time. Due to the soft consistency, it penetrates even the smallest gaps and thus compensates for bumps and other blemishes in the ground. Once cured, screed can be used as underfloor for floor coverings such as carpet, laminate, parquet or tiles - but he does not have to. Properly treated, the screed can also serve as a floor covering on its own.

What was once customary only in warehouses or industrial halls has long since found its way into the home of the four walls. The modern, stylish look of the floor covering as well as the low installation effort make screed very popular among DIYers. In addition, the screed floor is extremely hard-wearing and at the same time very easy to clean. However, who is up for another flooring & quot; on top of it & ldquo; decides, can not get around the screed. The poured stone floor must be treated differently depending on its use.

Screed as subfloor

Screed can be used as a solid surface for tiles, laminate or parquet. For this, the subfloor must first be checked for unevenness and, if necessary, compensated by grinding. Before the desired floor covering can be laid, the screed must be freed of dust and other impurities, as otherwise the floor covering will not find proper support. For floor coverings that are glued, such as linoleum or carpeting, a primer is also recommended to keep the floor covering right.

Screed screed - how it works

To remove loose material and roughen the surface so that it provides good adhesion, screed is sanded. This is especially necessary if the desired flooring is to be glued. However, manual work does not help. A single-disc grinding machine is necessary. If you do not have such a device at home, you can rent it at a hardware store or in a construction equipment rental company. When grinding, a high material abrasion is not required. As a rule, sanding sheets with a grain size of 16 are sufficient.

Use a respirator mask during the entire sanding process to prevent the ingress of dust particles into the lungs. To protect the eyes, wear dust goggles.

The single-disc grinder then moves in a cloister over the entire surface.

  • Single-disc grinder
  • 16-grit abrasive grinders
  • Industrial vacuum cleaner
  • Respiratory mask
  • Dust protection goggles

Before the floor can be further processed, it must be completely dust-free. Therefore, do not forget to vacuum after sanding. However, a normal house vacuum is not designed to absorb rock dust. The power is not enough to absorb all the dirt and in the worst case, the vacuum cleaner can overheat and break. In addition, the filters of the device may become clogged. Therefore, use an industrial vacuum cleaner.

Sand screed - this is how it is done

If unevenness is to be compensated, the screed must be sanded down. As a result, adhesive residues of old floor coverings and soiling are also solved. The abrasion of ordinary sanding sheets is not sufficient for sanding. Therefore, the single-disc grinding machine is equipped with a Diamanttrotierteller. The harder the surface, the more effective the abrasion will be with the diamond pad.

  • Single disc grinder
  • Diamond disc
  • Industrial vacuum
  • Respiratory mask
  • Dust protection goggles

Sand the soil systematically. If the screed floor is later to serve as an independent floor covering, it can be sanded until it is not only smooth, but even has a fine shine. Always wear respiratory protection and dust protection glasses when grinding. Before the soil is further processed, it must be dust-free. An industrial vacuum cleaner should also be used for this step. After work, check with a spirit level in several places to see if the floor is level. If the screed does not continue to be covered with tiles, parquet or the like, it must still be primed and finally sealed.


Before screed can be used as underfloor or final flooring in the living area, the cast stone floor must be properly processed , Depending on the final use, the screed is sanded or sanded down to lay carpet or linoleum or parquet, tiles or other flooring. The screed must also be sanded down if it is to be used as final flooring itself. In addition, the floor must then be sealed to protect it from dirt and moisture.

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