A little overview: plaster mortar groups

With the many graduations that are available for plaster mortars, there is often a jolt of confusion. To provide a little clarity, you will find in the following article the "official" plaster groups, as the DIN describes them. Read on here.

plaster groups according to DIN

First of all - for masonry, and all the mortars that are used there, the DIN 1053 applies, for all mineral plasters but the DIN V 18550. The resin plasters are then regulated separately in DIN 18558.

Mineral plasters

  • Group PI includes all lime plasters, air-lime plaster, water-based plaster or plasters with hydraulic lime
  • Group P II are all lime-cement plasters
  • Group P III are all cement plasters Gruppen Groups IV and V are all gypsum plasters, gypsum sand plaster and plaster lime plasters, in Group V with a higher percentage of gypsum.

This actually clear classification is unfortunately made more difficult by the fact that there is parallel to the DIN EN 13279, which makes a separate - and quite complicated - division into groups from B1 to B7.

As a rule, however, you are only confronted with it if you follow the manufacturer's instructions for the permissible plaster on a building material. As a rule, you can then ask the dealer again for safety's sake, so as not to use an unsuitable plaster, which does not last in the end.

Synthetic plasters are a separate group

The resin plasters belong, as already mentioned, in a separate standard group - unlike the mineral plasters they are also usually diffusion-tight, which is usually relatively unfavorable. Nevertheless, in practice they are one of the most common types of plaster.

The mineral plasters are often only used as concealed plaster and today are applied by machine in most cases. Even lime plasters, which have hardly been used for a few years, have been in great demand again since they were machine-finished and single-layered.

In addition, there are corresponding processing and usage instructions for every plaster in DIN.

Tips & TricksPutz should always be used as ready-made plaster - mixing by prescription is a science in itself and requires a lot of experience. In addition, good timing is necessary.

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