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Hi. I've just had the above replaced with UPVC. The installer has provided over-facia vents (10mm); 1m vent every 5m, which he states is sufficient. Is this right? The roof span is 4.8m x 8.8m long (pitch is greater than 15 degrees). I've read BS5250 (and other advice) and it...

Hi. Few weeks ago I found condensation in my loft. I've been in the house about 18 months and had never noticed it before, although the insulation is dirty and some of the rafters look discoloured (although they seem sound enough) so I suspect it's not the first time this has occurred...