sorry I know this photo is awful. I’ve noticed this crack under some wallpaper in an upstairs bedroom. I’ve read step cracking is a worry. It’s about 10 inches from the top of the wall and to the right is a window. The plaster to the right does sound very hollow if you tap it. House is 1960s and I think it’s still original plaster. This is an end wall that does get a fair bit of sun. I’ve peeled back the wallpaper a little and can see a tiny crack but it does stick out a bit. I can’t see a cracks in the wall outside.
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