omegod wrote on 12. Dec 2009 at 13:51:
Just been up for the Crimbo decs and noticed a lot of condensation on the inside of the felt!!
Had the cavity walls and the loft insulated this year so think that is the cause but any ideas how to sort this ?
Guess there are a few roofers etc on here so would be grateful for any tips.
Sources of moisture up there are uncovered water tanks (especially hot water expansion) and hot air rising from the floor below through gaps, in addition to leaks.
Reduce sources and add/unblock ventilation.