Baumit Multicontact 55 W as interior plaster

Hello,

Our new building was just plastered with a lime-cement plaster because the diffusion openness of the walls was important to us. Unfortunately, we don’t like the Q2 finish enough to paint the walls immediately, which was basically planned.

Now the question is how to get the walls plastered a bit smoother without destroying the advantage of diffusion openness (as opposed to a completely smooth gypsum plaster).

I asked a local plasterer about this. He said he would do it with Baumit Multicontact, using a rubbing technique with a sponge, not troweled or smoothed. He already demonstrated it on 2 square meters and we like the result very much.

What we can’t judge is whether the plaster is really so good, that is diffusion open. Or whether this goes against the principle of a healthy indoor climate. At this point, I don’t put much stock in Baumit’s advertising slogans.
Can anyone report more about the plaster or otherwise contribute something meaningful on this issue?

Best regards
Roppo

In general, with KZP, the less cement there is, the more diffusion-open and mold-inhibiting it is. The Multicontact is, as the name suggests, suitable for all applications inside, outside, and even on ETICS. But it has a water absorption class of W2, highly water-repellent. Nothing gets in there. We have had good experiences with Baumit Klima Fein W. It is class W0 with hardly any cement. After a year of living here, the air is top without room ventilation. I liked Klima Glätt W even better, but smoothing is a lot of work and expensive. We have the smooth finish throughout the living area, but applied it ourselves. The Klima series from Baumit overall has only a small amount of cement additive. For the right indoor climate, you should also use silicate paint when painting.