ᐅ Smoothing Rough Plaster – Which Plaster and Edge Profiles Should Be Used?

Hello,

In our new old house, all walls have roughcast plaster. We would like to smooth it out if possible. Additionally, we want to have the baseboards flush with the wall surface.
- Which plaster would you recommend for smoothing?
- Can you recommend a steel profile to embed for the baseboards?
- How would you generally approach plastering the wall (steps to follow)?

We look forward to your answers!

Best regards, Dirk

Anyone have any ideas?

DirkW schrieb:
In our new old house, all walls have rough plaster. We want to smooth it out if possible.

What type of rough plaster is it? Lime, lime-cement, or gypsum? If you know, you can apply a finishing plaster on top, then level and rub it down.

Since the old plaster is most likely painted, this is not so straightforward, as new plaster often adheres poorly on painted surfaces. If the paint is not a film-forming peeling type, but for example silicate or lime paint, the surface can be consolidated and bound with potassium water glass, then primed with a quartz-based primer. After that, the new plaster can be applied, but this only works with mineral-based plaster types such as lime or lime-cement.

If the house is empty or undergoing renovation anyway, you could also use a plaster grinder to sand the plaster evenly before applying finishing plaster over it.

Hi,

Thanks for the reply! How can I find out which type of plaster it is?
There is clearly no paint on it.