The quality of the interior plaster is crucial for the later wall design

The quality of the plaster surface influences how your wall should be processed once. The substrate must meet certain requirements for subsequent wall coatings and is divided into quality grades. We explain the differences.

What differentiates the quality levels?

Perfectly smooth surfaces are nice to look at, but are not suitable for every type of wall coating. Be it just tiles or the high-quality vinyl wallpaper, each coating requires a different level of quality.

Therefore, the surface treatment of plastered walls, ceilings or plasterboard walls is divided into four stages. Depending on the quality level, the subsequent processing of the wall surfaces depends. But what is behind the quality levels?

Quality level Q1

This is a simple plaster in which no attention is paid to the external appearance. All that matters is that there is a closed plaster surface, where shrinkage cracks can occur or also the loss of material in the case of over-plastered joints.

Quality level Q2

This is a standard quality plaster that is peeled off. Here, too, no special requirements are placed on the optics. In contrast to quality level Q1, however, recessed joint areas are filled in here.

Quality level Q3

These plasters are just deducted. This requirement requires the use of cleaning strips or flush-mounted profiles.

Quality level Q4

These plasters fulfill the highest demands by focusing on full surface covering and smoothing of the entire surface.

What are the different quality levels required for?

qualitysuitable for:Examples
Quality level Q1Only as a basis for further processingTiles, slabs or other ceramic wall coverings
Quality level Q2Standard quality in most new buildingsDecorative plasters from 1 mm thickness, abrasive plaster, coarse to medium woodchip wallpaper, dispersion coatings
Quality level Q3For finely structured wallcoveringsWallpaper, fine Raspasertapeten, finely structured paintings
Quality level Q4smooth and textured wallcoveringsshiny metal or vinyl wallpaper, glazes, high-quality painting work

Tips & Tricks

If you use ready-made filler, please follow the used interior plaster material and pay attention to the binders. Gypsum-based binders are only suitable for interiors and tolerate no moisture. Cement-based screed can be used in damp rooms.

Product Image: Studio LaMagica / Shutterstock

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