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I mean the original roof has rosemary roof tiles and due to height restrictions with the hips my new extension had to have a significant top section which is a flat roof. I would appreciate some advice on the damp/mould issue. will vents higher up, ie above the insulation help? I'm very...

I have recently built an extension. Due to roof on original I have had to put the top section of the new roof in a flat roof. I used a single ply membrane. It was completed around two months ago and already all the ply on the underside is covered in mould. im fairly sure there is no leak and...