Does anyone have any advice on how we might repair this? Our small bathroom has an exhaust fan in the middle of the ceiling. It just vents straight into the attic. The pipe for the toilet, running up through the attic and outside, has some condensation on it and is fairly close to where the actual leak is happening, directly over the sink, on the outside wall. The insulation is dry, but there is a rather large and consistant drip running down the wall, still in the fixable stage, but I'm just not sure of the process. Not sure just where the moisture is actually coming from. No leak in the roof or guttering. Should we run a pipe for the exhaust fan on through the roof to outside? If it is condensation, it seems like it's a lot. Thanks for any help.