I still think though that in order to get condensation, there has to be a
temp difference somewhere. So maybe beefing up the loft insulation over the
pipes also might keep it down.
Anyone tried stretching that substance called papronet across the void. It
seems to stop drips in greenhouses quite well while stopping the drips its
porous enough though allow air through.I will age though. Goes brittle.

Brian

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The Sofa of Brian Gaff...

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Are the holes where cables penetrate the ceiling for light fittings
vapour proof or just a roughly cut hole with loads of space around
the cable? Particularly for fittings in rooms with high humidity,
kitchen, bath/shower rooms. Are any ceiling down lighters open at the
back? They ought to be fire proof anyway to slow the spread of fire
from the room to loft space.

Yes, non-fireproof downlighters in kitchen and bathroom (as was at purchase
last year) but now fitted with LEDs. Didn't realise these may be
contributing to moisture ingress. I'll also have a look at sealing wire
holes in ceiling for normal light fittings (non-downlighter type).

Thanks