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Thanks Mr F - mor eor less what I imagined - and yes I raised the sagging issue too cheers Al

I am being told that the following roof construction offers no condensation risk because of the semi-permeable nature of the single ply membrane - and because of the fact that the vapour barrier means that there is no 'new' moisture access to the air. but using free online cond-risk tools...

Hi folks - 1st post... so plse be gentle.... Please advise - has anyone any1st hand experience of the extruded 'Ruabon' quarry tiles sourced from Shipley in Bradford. The company is called 'dennis ruabon ltd' but since Ruabon's factory is (again) operating from their base in Hafod in...