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.
Repair bathroom ceiling mold.
If the surface is too porous to remove mold completely such as in ceiling tiles you may have to replace it.
Since mold is a fungus that thrives in damp environments it is not uncommon to find mold growth on a bathroom ceiling.
Mold in the bathroom ceiling is caused by a wide range of factors.
Otherwise it is likely to peel.
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.
What causes mold in bathroom ceiling.
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.
To prevent mold regrowth coat your ceiling with a stain killing primer then paint over it with a mildew resistant latex topcoat.
Ceilings constructed with any porous material cannot be cleaned and must be replaced but smooth ceiling surfaces can be cleaned inexpensively and with relative ease.
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.
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.
It can be caused by the warm temperature of the room the humidity from baths and showers low levels of natural light and poor air circulation.
These make ideal conditions for mold to grow.
The bathroom is exposed to excessive moisture from the shower and is often not properly ventilated producing high levels of humidity.
Clean the area with a household bathroom cleaner first then use either a bleach solution or vinegar to kill the mold.
The most common causes are.
To prevent mold from growing in the shower or bath again keep the bathroom ventilated and control moisture as much as possible.
To speed up the job try a mold cleaner specially formulated with mold killing ingredients.
After cleaning consider repainting the ceiling with anti mold paint to prevent recurring issues.