We have an Edwardian maisonette with a flat roof at the back that covers the kitchen, bathroom and utility room. We had the flat roof converted into a roof terrace by extending the wall upwards around it and had a deck built over the top. A new roof covering was very badly laid at the time and last year it started to leak quite badly in the bathroom.
Earlier this year we had a new roof put on, replastered the ceiling and replastered the wall using sand and cement under the plaster finish but the ceiling and wall in the bathroom are still really damp - better than they were, but still very noticeable. I blamed the new roof but the roofer said it wasn't - in the end I tipped a dozen buckets of dyed water over it to "prove" the roof was leaking but, er, none of the dyed water came through.
So what is causing the damp? I don't think it is condensation - it definitely looks more like the penetrative type of damp - it's two storeys up and is worst in the bathroom (the flat roof is laid so that any water on it should run off to the corner above the bathroom), doesn't seem to have effected the utility at all (the middle room) and does occasionally show in the kitchen. Any ideas/diagnoses gratefully received.
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Any advice on a damp wall?
10 replies
lalalonglegs · 26/09/2012 11:03
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