Lime or gypsum plaster? A small decision-making aid

When it comes to choosing the type of plaster for interior plaster, often different opinions meet. The advantages of lime plaster and gypsum plaster, and what is recommended, are described in detail in this article.

Lime plasters and gypsum plaster

With the plaster types in the DIN one can distinguish different compositions and compare therefore also with each other. A separate group is the pure lime plasters, in the DIN "lime mortar" (group P1).

Gypsum plasters are not only described in group P IV of DIN 18550, but because of their diversity they are also divided into different groups in DIN EN 13279. There are various property-changing factors to bear:

  • the proportion of building lime in the plaster
  • Plaster or light plasters with different aggregates
  • Plasters with special surface hardnesses

So you always have to pay attention - especially with gypsum plaster - to which plaster you are talking about and which aggregates and mixing ratios the plaster has. Accordingly, the plying properties can be different.

Advantages of lime plaster

A pure lime plaster offers in any case for the interior plaster the best alternative. Lime plasters consist almost entirely of natural ingredients. It is supple, usually well-adherent and has some major benefits for the indoor climate:

  • he is very moisture-regulating
  • he absorbs excess moisture from the room
  • it is so strongly alkaline that mold can not grow (naturally moldy)

It is commonly considered the best possible alternative for interior plasters, but is a bit more complex to work with, which also increases the cost of interior plaster. With self-made Kalkstreichputz you can compensate but of course something again.

Advantages of gypsum plaster

Gypsum plasters are characterized above all by short service lives (fast drying and further processing), and ensure particularly smooth surfaces. He does not have moisture-binding or mold-repelling properties.

Tips & Tricks

Of course, mixtures of lime and gypsum can also be produced in the plaster. As a rule, pure lime plaster is always the better alternative to lime plaster plasters.

Video Board: Teaching mixing applications Eco Stucco and lime Tadelakt applications