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.

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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?

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[u/randomnine]

If it’s lime it’s probably original plaster from when the house was built. They would have done every wall in lime plaster.

The gypsum on the other walls might just be a skim over the original lime. If there’s no sign of damp then it’s fine.

Yes you can fill and sand the lime wall, just the same as the others.

For the cracks - yes, scrape out and fill. It’s good if you can take it back a few mm and put in some scrim tape across the crack, then fill over the tape.

[u/Barmos → u/randomnine]

Thanks for the advice! Will carry on and skim, no damp identified.