Hello,
Our new build was just plastered with a lime-cement render because we wanted the walls to remain vapor permeable. Unfortunately, we’re not fully satisfied with the Q2 finish, so painting the walls immediately—which was originally planned—is not ideal.
Now the question is how to achieve a smoother plaster finish without losing the advantage of vapor permeability (unlike a completely smooth gypsum plaster).
I asked a local plasterer about this. He said he would use Baumit Multicontact applied with a rubbing technique using a sponge, not troweled or smoothed. He demonstrated it on 2 square meters (22 square feet), and we really like the result.
What we cannot assess is whether the plaster truly maintains good vapor permeability or if it might conflict with the principle of a healthy indoor climate. I’m not relying much on Baumit’s advertising claims at this point.
Could someone share more information about this plaster or otherwise provide useful input on this matter?
Best regards,
Roppo
Our new build was just plastered with a lime-cement render because we wanted the walls to remain vapor permeable. Unfortunately, we’re not fully satisfied with the Q2 finish, so painting the walls immediately—which was originally planned—is not ideal.
Now the question is how to achieve a smoother plaster finish without losing the advantage of vapor permeability (unlike a completely smooth gypsum plaster).
I asked a local plasterer about this. He said he would use Baumit Multicontact applied with a rubbing technique using a sponge, not troweled or smoothed. He demonstrated it on 2 square meters (22 square feet), and we really like the result.
What we cannot assess is whether the plaster truly maintains good vapor permeability or if it might conflict with the principle of a healthy indoor climate. I’m not relying much on Baumit’s advertising claims at this point.
Could someone share more information about this plaster or otherwise provide useful input on this matter?
Best regards,
Roppo
In general, with KZP (capillary active plaster), the less cement it contains, the more vapor-permeable and mold-resistant it is.
As the name suggests, Multicontact is suitable for all applications indoors, outdoors, and even on external thermal insulation composite systems (ETICS). However, it has a water absorption class of W2, meaning it is strongly water-repellent. No water can penetrate. We have had good experience with Baumit Klima Fein W. It has a water absorption class of W0 with very little cement. After living with it for a year, the indoor air quality here is excellent without mechanical ventilation.
I liked Klima Glätt W even more, but the smoothing process is very labor-intensive and expensive. We applied the smooth finish ourselves throughout the living area. The Klima product line from Baumit contains only a small amount of cement overall.
For an optimal indoor climate, you should also use silicate paint when painting.
As the name suggests, Multicontact is suitable for all applications indoors, outdoors, and even on external thermal insulation composite systems (ETICS). However, it has a water absorption class of W2, meaning it is strongly water-repellent. No water can penetrate. We have had good experience with Baumit Klima Fein W. It has a water absorption class of W0 with very little cement. After living with it for a year, the indoor air quality here is excellent without mechanical ventilation.
I liked Klima Glätt W even more, but the smoothing process is very labor-intensive and expensive. We applied the smooth finish ourselves throughout the living area. The Klima product line from Baumit contains only a small amount of cement overall.
For an optimal indoor climate, you should also use silicate paint when painting.
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