Hi....sorry if this is a duplicate. We have a dormer with toilet / bathroom. I notice an oblique crack across the plaster wall moving onto the ceiling. This closely follows where the join of the dormer abuts onto the roof . Tapping the area below the crack is solid...above....hollow. The crack is no more than half mm at it's widest. The house is over 50 yrs. old. Who do I get to assess the problem...if it is in fact a problem. Any ideas? thanks Ian
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