What is causing these cracks under the shelves

ruggiero · 23 Nov 2025

I noticed these cracks under the shelves in my storage room. It’s an old building in Scotland.

If you touch it’s a bit crumbly, but the wall is quite solid.

The shelves are quite sturdy.

Any idea what is causing it and how to fix it or clean it up?

RrogerD · 23 Nov 2025

I wouldn't worry about it if it is under the shelves, you won't see it anyway.
If you're really concerned then fill with decorator's caulk. It's flexible. It's the expansion and contraction of the wooden shelves that have caused the cracking and the plaster to break away.

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What is causing these cracks under the shelves

ruggiero

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