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So my partner and I are working to restore an old interior brick wall (about 100 years old). We have stripped off the plaster and cleared out all the loose, crumbling mortar in some sections of the brick. But this has left some gaps, particularly between the brick wall and the wooden sash window frame.

We are a bit stuck on what is the best material or combination of materials to fill it with. Our thinking is to fill the gap between window and brick with expanding foam and then use a lime mortar or lime putty over the top of the foam. We would also repoint some sections of the brick using the same soft lime mortar. Is this a good idea? We would appreciate any advice!

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Tetsujin
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Laura B
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1 Answers1

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This seems like a classic case for mortar pointing to me (often called "tuckpointing", though somewhat erroneously). It was filled with mortar before and that's the right thing to fill it with again. It'll look right and be solid.

There's little benefit to be gained from trying to add insulation, but it may make sense to caulk from the outside to seal against drafts.

isherwood
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