My situation is this: A friend has a 1977 mobile w/ snow roof. The metal roofing was installed w/o any insulation layer and no ventilation to the snow roof which sits very low over the mobile so there is little air transfer. The humidity in the area is high 70% on 9-2-13 and receives heavy rains in winter which causes heavy condensation on the underside of the metal roof. the condensation is so heavy that it 'rains' on the roof of the mobile and leaks into the home. The interior humidity can exceed 50% and mold is a big problem. I have a budget of $3K How do I eliminate the condensation under the snow roof? Remove metal roof and emplace insulation, replace metal? Increase ventilation with fans and gable vents? Other?