Following on from the "Mushrooms growing on wall" thread, we had a roofer inspect, and he found the felt on our storm porch had rotted and water coming down the valley was sloshing through, and getting into the roof behind. Causing the internal wall to get damp - hence mushrooms (cellar cup).
Anyway, roof has been re-timbered, and re-felted, and since he was here, we had him fix our ridge tiles with the roll-fix system.
So what is the best way to ensure we dry the room out properly ? And how long should we wait before redecorating ?