Hello everyone,
I have a question for the building experts regarding interior plaster. Unfortunately, we have not yet found a well-founded opinion on this.
In our preliminary building specification (contract not yet signed), it states that the interior walls are to be finished with gypsum plaster.
When our building plans became more concrete, I also got some literature. From the book "(K)ein Pfusch am Bau: Wie ein Bausachverständiger (s)ein Haus richtig und dennoch kostengünstig bauen würde“ by Günther Nussbaum-Sekora (which I find really good as a layperson), the following quote:
[ I]Due to my inquiry (note: building surveyor), the building quality could already be improved before the first ground-breaking.[/I]
[ I]According to the building specification “interior plaster machine application”[/I]
[ I]What was meant was the cheaper and moisture-sensitive gypsum plaster. It was upgraded at no extra cost to lime plaster. The high pH value of lime (>12) prevents microbial growth.[/I]
End of quote
In addition, we will be building with Ytong blocks and installing a ventilation system.
So now my question to you is:
Does anyone have experience with this?
Are there other aspects besides microbial growth that would speak for or against lime plaster? (e.g. problematic texture, more difficult application or finishing, paintability, wallpapering issues, moisture sensitivity, or similar)
(where I understand the purpose of lime plaster is to absorb moisture better)
If you support using lime plaster, would you use it throughout the entire living area as interior plaster or only in wet areas (bathroom, kitchen, utility room)?
If my assumption is correct that lime plaster absorbs moisture better – does this still make sense if a ventilation system is installed that already removes room humidity?
Thank you very much for your answers
f-pNo
I have a question for the building experts regarding interior plaster. Unfortunately, we have not yet found a well-founded opinion on this.
In our preliminary building specification (contract not yet signed), it states that the interior walls are to be finished with gypsum plaster.
When our building plans became more concrete, I also got some literature. From the book "(K)ein Pfusch am Bau: Wie ein Bausachverständiger (s)ein Haus richtig und dennoch kostengünstig bauen würde“ by Günther Nussbaum-Sekora (which I find really good as a layperson), the following quote:
[ I]Due to my inquiry (note: building surveyor), the building quality could already be improved before the first ground-breaking.[/I]
[ I]According to the building specification “interior plaster machine application”[/I]
[ I]What was meant was the cheaper and moisture-sensitive gypsum plaster. It was upgraded at no extra cost to lime plaster. The high pH value of lime (>12) prevents microbial growth.[/I]
End of quote
In addition, we will be building with Ytong blocks and installing a ventilation system.
So now my question to you is:
Does anyone have experience with this?
Are there other aspects besides microbial growth that would speak for or against lime plaster? (e.g. problematic texture, more difficult application or finishing, paintability, wallpapering issues, moisture sensitivity, or similar)
(where I understand the purpose of lime plaster is to absorb moisture better)
If you support using lime plaster, would you use it throughout the entire living area as interior plaster or only in wet areas (bathroom, kitchen, utility room)?
If my assumption is correct that lime plaster absorbs moisture better – does this still make sense if a ventilation system is installed that already removes room humidity?
Thank you very much for your answers
f-pNo
K
K.Brodbeck20 Jul 2013 08:21Hello f-pNo,
It is true that lime plaster prevents microbial growth, and it is also true that it can absorb and release moisture effectively. Although gypsum plaster can do this as well, it is not as efficient.
The interior plaster (lime or gypsum) must be painted with a vapor-permeable paint if it is to be coated, so the plaster can respond to moisture. A dispersion paint acts as a barrier and therefore nullifies these beneficial properties. Regarding lime plaster, I am not sure if you can use any type of paint or if you have to switch to lime paint anyway.
The lime plaster, which is supposed to prevent microbial growth, should either not be painted at all (as is the case for me) or be repainted with lime paint after 5 to 7 years at the latest. The pH value changes over time. I applied lime plaster in the bathroom of our older house because we had mold problems after replacing the windows, which have not occurred since.
In principle, you will probably not necessarily need either of these due to your ventilation system; if you have any issues, you are more likely to struggle with air that is too dry.
K.Brodbeck
It is true that lime plaster prevents microbial growth, and it is also true that it can absorb and release moisture effectively. Although gypsum plaster can do this as well, it is not as efficient.
The interior plaster (lime or gypsum) must be painted with a vapor-permeable paint if it is to be coated, so the plaster can respond to moisture. A dispersion paint acts as a barrier and therefore nullifies these beneficial properties. Regarding lime plaster, I am not sure if you can use any type of paint or if you have to switch to lime paint anyway.
The lime plaster, which is supposed to prevent microbial growth, should either not be painted at all (as is the case for me) or be repainted with lime paint after 5 to 7 years at the latest. The pH value changes over time. I applied lime plaster in the bathroom of our older house because we had mold problems after replacing the windows, which have not occurred since.
In principle, you will probably not necessarily need either of these due to your ventilation system; if you have any issues, you are more likely to struggle with air that is too dry.
K.Brodbeck
S
Sebastian7911 Jun 2015 22:55I would only use lime cement in the garage because of its rough surface – definitely not inside the living areas. Unless, of course, you cover everything with wallpaper...
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