Internal Damp on Chimney breast

[michaellady]

We have a 1930's semi, recently refurbished. However downstairs on the chimney-breast in both corners are damp mark appearing through the plaster. Chimney-breast is not on outside wall.
One side actually smells damp, could this be rainwater coming down the chimney and permeating to the outside?

[stoneyboy]

michaellady,
could this be rainwater coming down the chimney and permeating to the outside? yes either that or condensation. Eliminate rain getting down the chimney first.
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