Damp Proofing

How to trace source of damp patch on chimney breast? Chimney pot capped and stack repointed

Anonymous user 28/02/2024 - 3.07 PM

There is a damp patch on the chimney breast which has been there for some considerable time. The chimney pot has been capped and the stack repointed. The chimney is built on the outside of the house.The patch is on the wall in the downstairs room. Originally there was a solid fuel fire now replaced by a gas fire which is rarely used. Rain does not automatically increase the size of the patch. Has anyone any ideas where the problem comes from or how to trace the source. Thanks