Mold on a ceiling has one of two sources: moisture from the room below it, or water coming from above. Small gray or black spots on a bathroom ceiling are usually the first kind and can often be cleaned. A brown ring, a sagging patch, or mold that spreads from one spot usually means the second, and cleaning the surface will not fix it.
This guide explains how to tell the difference, how to clean a ceiling safely, and when the drywall needs to come out.
Where ceiling mold comes from
From the room:
- Bathrooms. Steam from showers condenses on the ceiling, especially with a weak or unused exhaust fan.
- Kitchens. Cooking without a vented range hood adds moisture.
- Cold spots. Corners of top-floor rooms and areas with missing attic insulation run cooler, so moisture condenses there.
- Around air vents. Cold supply air can chill the grille and the ceiling around it enough for humid room air to condense.
From above:
- Roof leaks and storm damage
- Attic condensation, from bathroom fans venting into the attic or poor ventilation; see mold in the attic
- Upstairs bathrooms, from leaking toilets, tubs, showers, and supply lines
- Air conditioning equipment above the ceiling, from overflowing drain pans, clogged condensate lines, or sweating ducts; see mold in the AC and ducts
- The unit above, in condos and apartments
Surface mold or a leak?
| Clue | Points to surface mold | Points to water from above |
|---|---|---|
| Pattern | Scattered small spots, often near the shower or in corners | A ring, stain, or patch that spreads from one area |
| Color | Gray, black, or green specks | Brown or yellow water marks, sometimes with mold at the edges |
| Surface | Paint intact | Bubbling paint, sagging, or soft drywall |
| After cleaning | Stays clean if ventilation improves | Returns, often in the same shape |
| Timing | Worse after showers or in humid months | Appears after rain or when a fixture above is used |
How to clean mold from a bathroom ceiling
For small areas, under about 10 square feet, on a painted ceiling that is otherwise sound:
- Protect your eyes and lungs. Working overhead means debris falls toward your face, so wear goggles without vent holes, gloves, and an N-95 respirator.
- Ventilate. Run the fan or open a window.
- Wipe gently with detergent and water. Do not soak the drywall.
- Dry the area completely.
- Fix the ventilation. Make sure the exhaust fan works, vents outside rather than into the attic, and runs during and after showers.
- Then prime and paint. A paint made for bathrooms helps, but the EPA advises against painting over mold; clean and dry first.
The EPA does not recommend bleach or other biocides as a routine part of cleanup. Never mix bleach with ammonia or other cleaners.
When the ceiling has to be replaced
- The drywall is stained through, soft, or crumbling
- The ceiling sags or bulges
- Mold returns in the same spot after cleaning
- The ceiling is made of tiles; moldy ceiling tiles are porous and should be replaced, and the EPA notes that mold can grow on the hidden top side of ceiling tiles
- The area is larger than about 10 square feet
Safety first with a wet ceiling. Drywall that holds water can come down suddenly. Keep people out from under a sagging ceiling, turn off power to any light fixture or fan in the wet area, and stop the water source if you can.
Replacing a moldy ceiling section involves containment, cutting out the drywall, checking and drying the joists and insulation above, fixing the leak, and then rebuilding. See mold behind drywall for how that work is done.
Water damage in the ceiling
If a leak has just happened, act quickly. The EPA advises drying water-damaged areas within 24 to 48 hours to prevent mold growth. Stop the water, remove wet insulation above the ceiling if you can reach it safely, and get air moving. A ceiling that stays wet for days is likely to grow mold inside even if the surface looks fine.
What it costs
Removing mold from a small section of drywall runs about $300 to $825, according to Angi. Bathroom mold remediation typically costs about $500 to $2,000, per HomeGuide, and drywall replacement and painting are often billed separately. See our mold remediation cost guide.
Insurance
If the ceiling was damaged by a sudden, covered event, such as a burst pipe upstairs or storm damage to the roof, homeowners insurance may cover the mold up to a separate mold limit. Mold from shower steam, poor ventilation, or a slow leak is usually excluded. In a condo, the source of the water affects whether your policy or the association's applies. See does homeowners insurance cover mold.
Ceilings in Florida homes
In Florida, air conditioning equipment often sits in attics or above ceilings, so overflowing drain pans and sweating ducts are a common cause of ceiling mold, along with roof damage after storms. Mold spots around supply vents are frequent in humid months. In condos, a leak from the unit above is a common source. See local pages for Miami, Orlando, and the rest of Florida.
Next step
If you own your home and the ceiling is stained, sagging, or keeps growing mold after cleaning, call the number on this page to be connected with an independent local mold removal company.