IMM wrote
?? I presume you mean "benefits". This is nonsense. Keeping a loft warmer would *increase* the heat loss, not decrease it!! Or do you mean reducing the rate of air change in the loft would save energy? That would only be true if you had inadequate insulation.
Condensation is caused mainly by the lifestyle of the inhabitants, not the nature of the structure.
It would help slightly, but that's all you can say. But this benefit would be more than wiped out if you had warmer air in the loft (with higher vapour content) and less ventilation.
Look, what was the point of you posting this thread? You obviously think you know all about it and don't want to listen to anyone's advice. So why ask? You do it your way and good luck to you.
Peter