A bathroom fan vent pipe must be properly insulated to prevent condensation. Breakdowns like this can create moisture that will travel back into the living spaces and cause damage.
the space within the roof area of a building. Where insulation is located.
Water damage on ceiling drywall isn’t always due to a roof leak or insulation issues. Sometimes the work of other trades in the attic fails and causes additional moist air that is not properly ventilated. It’s a good idea to poke your head into your attic at the first signs of water damage on the ceiling.