Large crack appeared under flat roof ... used to be the coal shed Information, help and advice on maintaining, installing and repairing a flat roof. Post your questions and view answers here

[Helensd]

Hello. I moved into a rather run down 50s concrete block house. There used to be an unattached coal shed but this has long been converted into an extra room. A large crack has appeared - see photo. Is this structural, or can I just plaster over it. Many thanks to anyone willing to help. Best wishes, Helen.

[stoneyboy]

Hi helensd,
Being a coal shed it’s likely to have single skin brick walls and a concrete roof, there will always be movement between these two. Suggest you fill the crack and see whether is reappears.
Regards SB

[Helensd]

Hi helensd,
Being a coal shed it’s likely to have single skin brick walls and a concrete roof, there will always be movement between these two. Suggest you fill the crack and see whether is reappears.
Regards SB

Thank you. Helen.