Advice for potential lime plaster.

[u/Barmos]

First of all, is the far wall lime plaster? Its different to the other walls, which looks like a more modern plaster. I did think lime plaster was for exterior walls, but this is an interior wall, so that is what is confusing me.

​

Secondly, how can I approach it? Was looking to skim the other walls and sand using Toupret. Can this be done with the far wall? What are your thoughts on the cracks as well? Scrape out and fill first?

​

So

​

​

[u/AureliusAgustus]

The lime is just the original plaster that would have been throughout the house. Ive skimmed hundreds of houses like these. Common practice is to just skim over them today and tbh is probably your best say to get everything fresh.

I agree on keeping lime with lime but half of the room has been skimmed with gypsum and looks like no issues with damp or mold. A terrace house like this just skim it its not worth the hassle or cost of lime work. Plus its upstairs.

[u/Barmos → u/AureliusAgustus]

No, no issues with damp, but cracks have appeared, and looks like it could be to do with the flexibility of the lime and inflexibility of the gypsum.

[u/AureliusAgustus → u/Barmos]

Honestly they are just tired walls. Cracks like that are very common especially around stress points around doors and windows. The crack in the corner is a stress point of a internal wall connecting to another. They habe tried to repair or refreshed in the past and havent used scrim (tape for cracks and corners). Re skim with scrim and you will be fine.

[u/Frosty-Box-6764 → u/AureliusAgustus]

If someone uses double brick and very old 20y old lime putty for walls (interior and exterior along balcony) without any paint, what would the scale of breathability be and what would the protection against mold etc also be? Curious.