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Polygon
Acliff
The advice I got further up the thread about felt lap vents for the roof seemed to have made a fair bit of difference.
In my case the humidity got worse (obvious thinking about it now) after we boarded the loft, and also recently getting solar panels on the roof.
Lap vents seem to have got rid of the condensation on the inside of the roof felt, but not before an Ikea seat got proper mouldy and had to be chucked out.