We live in a 12 by 60 mobile home with a sheet metal roof - over. We have a constant problem with the corners and some of the walls "weeping" (developing moisture) I know it is not a plumbing problem. I think it is because the roof is not properly vented. There is no soffet or ridge vent, no gable vent or the box type vents. Am I correct or would the ridges in the sheet metal be enough to vent it or am I totally off base?