Notice how the dark line on the insulation in the photo below line up with the top plate.
Mold in attic above bathroom.
The most common cause of attic mold by far is blocked or insufficient ventilation of the attic space.
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This is a different perspective from the other video about bathroom fan venting causing mold.
Paint the bathroom ceiling with a high sheen gloss paint.
Insulate the attic space above the bathroom to prevent excessively cold surfaces on the ceiling.
Related to 3 above this practice can pump warm moist air into the attic where it can be trapped and begin the cycle of mold growth.
Mold needs 3 things to grow.
Dryer vents plumbing vents kitchen or bathroom fans vented into the attic.
Matte and other low sheen paints absorb much more moisture which in turn leads to mold growth.
Mold species such as stachybotrys chartarum which looks like slimy growth loves attic basement bathroom and space under the sink black mold can also grow behind the walls or attic ceilings completely undetected until the occupants smell the presence or experience health problems.
What causes black mold in attic.
This is why you rarely find mold growth in the attic above a garage or a rarely used portion of the home.
If you eliminate just one of these elements mold will starve and die.