Patch plastering in a Victorian terrace

markmcvit · 16 Jan 2021

Hi,

I am renovating a Victorian terrace in Manchester.

Some of the plaster was loose, so I have chipped it away.

However I'm not sure how to rectify it now.

It's at the front of the house, and I am worried about damp forming if I do it wrong.

Should I plaster it with hydrated lime or can I get away with using bonding then skim?

Thanks

JohnD · 16 Jan 2021

lime will be preferable, although if the wall has previously been stripped and replastered, patch it in the same. Gypsum is usually pinkish or brown but may be light grey. yours looks to me like it might be a mortar backing with a plaster skim.

IME old lime plaster is creamy or light grey, the backing being gritty and the finish being smooth, but it varies by region.

markmcvit · 16 Jan 2021

@JohnD cheers for the quick reply.

That's what I suspected.

Looks like lime underneath, and gypsum skim over the top. Should I do the same then?

JohnD · 16 Jan 2021

may as well. It will match. The skim was probably an earlier renovation.

markmcvit · 17 Jan 2021

@JohnD Thanks again mate.

Final question, I bought this from selco, do I just knock it up with some building sand?

JohnD · 17 Jan 2021

I have had lime plastering done, but not done it myself.

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Patch plastering in a Victorian terrace

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