The bathroom is exposed to excessive moisture from the shower and is often not properly ventilated producing high levels of humidity.
Repair bathroom ceiling mold.
If your bathroom has a high level of humidity for a couple of days mold may start growing in different parts of the bathroom including the ceiling.
Since mold is a fungus that thrives in damp environments it is not uncommon to find mold growth on a bathroom ceiling.
Clean the area with a household bathroom cleaner first then use either a bleach solution or vinegar to kill the mold.
Otherwise it is likely to peel.
These make ideal conditions for mold to grow.
Mold growth beneath the insulation would require a roof leak which you d typically notice on the ceiling inside the home before any real mold growth occurred.
During hurricane harvey the paint and sheet rock on the ceiling in our guest bathroom began to peel and crack.
Always undertake mold removal and dry any surface before you paint.
To prevent mold from growing in the shower or bath again keep the bathroom ventilated and control moisture as much as possible.
Mold in the bathroom ceiling is caused by a wide range of factors.
To speed up the job try a mold cleaner specially formulated with mold killing ingredients.
If the surface is too porous to remove mold completely such as in ceiling tiles you may have to replace it.
References this old house.
In addition to being unsightly bathroom ceiling mold can cause permanent damage to your home and is a health hazard for you and your family.
The most common causes are.
What causes mold in bathroom ceiling.
After cleaning consider repainting the ceiling with anti mold paint to prevent recurring issues.
Cleaning mold from the shower or bath can be done with the same methods used on the ceiling.
Vinegar use a spray bottle to saturate the moldy area with white vinegar let it sit for 30 minutes scrub with a brush spray again let sit for an additional 30 minutes rinse with warm water.
To prevent mold regrowth coat your ceiling with a stain killing primer then paint over it with a mildew resistant latex topcoat.