ᐅ Which type of plaster should be used? What are the differences?
Created on: 9 Jan 2020 13:53
T
Tx-25
Hello.
Soon the plasterers will arrive at our new build.
Since we want to have only a small amount of wallpaper and tiles on the walls, we have now chosen gypsum plaster from the options offered by our builder (cement plaster and gypsum plaster). Due to its smoother surface, it should be better suited for our project. According to the builder, the entire house can only be treated with one type of plaster. So it is not possible to switch to cement plaster in the bathrooms.
My question is:
Is gypsum plaster always the same as lime gypsum plaster? If not, what are the differences between lime gypsum plaster and gypsum plaster? Is the only difference the mold-inhibiting effect of lime?
Additionally, it is important to us that no moisture can penetrate through the plaster. Is this true for all types of plaster? Cement plaster absorbs moisture to some extent and releases it again. Wouldn’t that mean that moisture also passes through the plaster? This concerns the stone wool insulation behind the plaster. In some areas, moisture protection is only ensured by the combination of plaster and vapor barrier. Or would you recommend a completely different plaster? What do you think about using gypsum plaster in the bathroom? A controlled ventilation system with heat recovery is in place.
Soon the plasterers will arrive at our new build.
Since we want to have only a small amount of wallpaper and tiles on the walls, we have now chosen gypsum plaster from the options offered by our builder (cement plaster and gypsum plaster). Due to its smoother surface, it should be better suited for our project. According to the builder, the entire house can only be treated with one type of plaster. So it is not possible to switch to cement plaster in the bathrooms.
My question is:
Is gypsum plaster always the same as lime gypsum plaster? If not, what are the differences between lime gypsum plaster and gypsum plaster? Is the only difference the mold-inhibiting effect of lime?
Additionally, it is important to us that no moisture can penetrate through the plaster. Is this true for all types of plaster? Cement plaster absorbs moisture to some extent and releases it again. Wouldn’t that mean that moisture also passes through the plaster? This concerns the stone wool insulation behind the plaster. In some areas, moisture protection is only ensured by the combination of plaster and vapor barrier. Or would you recommend a completely different plaster? What do you think about using gypsum plaster in the bathroom? A controlled ventilation system with heat recovery is in place.
H
hampshire22 Apr 2021 23:21Yes, it’s not the budget version. We are impressed by the properties, color, feel, and texture.
F
fach1werk27 Apr 2021 09:34We also have a wall coated with clay plaster. It contains small straw pieces that, similar to a textured plaster finish, bring out the surface structure. I applied it myself, and it wasn’t difficult. However, I noticed less shine from the straw pieces compared to the sample board. We use only "natural" finishes throughout, and the indoor climate has been good from the start. I can definitely recommend it. However, we have masonry walls underneath, and the ceilings are covered with panels.
Good luck with your DIY project!
Gabriele
Good luck with your DIY project!
Gabriele
A quick question regarding plaster. Our general contractor is planning three layers of plaster: a base coat of lime-cement plaster (20mm/0.8 inches), a 2mm (0.08 inches) top coat, and a 3mm (0.12 inches) fine finishing coat. Are three layers of plaster common, or would just the base coat and top coat be sufficient before painting? Thank you very much.
A 2 mm (0.08 inch) top coat must be a fine plaster or a trowel finish. A third layer is basically unnecessary, especially if two thin-layer plasters are planned. Three layers are sometimes applied when a reinforcement layer is applied on the base coat, followed by a fine plaster, but this is usually done on exterior surfaces.