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No bathroom should be without a good ventilating fan ducted to the OUTSIDE, not to the attic or crawl space. I have seen them ducted to a cold attic and whoopie!! When things warm up, signs of wetness on the ceilings and not just in the bathrooms.
Here in the South West our baths are generally in the center of the house, no windows (skylights), but each has a relatively high volume fan.
Additionally, once you find the problem and correct (either inside humidity or outside infiltration, remember the place that shows the damage can be feet away from the actual cause) and eliminate the mold, paint with a product that contains mildewcide. If it is necessary to replace wallboard, go with the new stuff that ha no paper covering. And seal the inside surface that faces the studs.
Been there. Done that.
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Bob S. former owner of a 1984 silver 944
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