Damp loft

If there is enough heat to carry in condesnable moisture, that air wont be freezing when its in the loft. And neither therefore will it be at

And in any case, that air will be whisked out of the roof as a stream of steam, before it can settle on the beams.

And even if it does, the first dryer day, it will evaporate again.

If you seal the roof, that doesn't happen. Water vapour builds up

All I'll say is - it was like that when we bought the house... it helps keep the unpleasant smells at bay... but for no longer!

Steve

A few replies say more ventilation, but the weather recently has been very cold with little or no wind. It seems to me that the amount of ventiliation would be irrelevent unless there is at least a breeze?

Or have I missed something?

Graham

Google diffusion.

Yes, the rest of the year! Ventilation stops damp building up and speeds its disappearance, to the extent you may never see it.