How to Get Rid of Stubborn Mold Stain on Ceiling?

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Used a mold spray cleaner, which removed some, but there is a black mold stain. Used cleaner 3 times. The roof (flashing) got a bit damaged, and this caused the mold.

The stain is small, in 1 corner of ceiling. Does that chunk of ceiling need to removed/ new dry wall?

Or will vinegar remove stain?
How do u know if mold is underneath ceiling?

Also read about special mold paint, but does that just cover the stain? I need it removed.
I know the cause of it.. which will be repaired. The cause is flashing on roof, got damaged.

Has anyone had stubborn stain? I sprayed it, and saw black water dripping down the wall! It does not look wet, and got rid of some mold. But gray areas and black crevices remain.

Would you hire a drywall person to cut and remove? Or put the Kilz on top of stain? Like I said, I sprayed it with mold bleach cleaner, but its engrained into ceiling.

How do you know if mold is underneath ceiling? There are also yellow stains on different ceiling from air conditioner condensation. Could there be mold under that, too?
I just cleaned with vinegar, which got rid of a bit more. Whats left is 5 inches wide by 1 inch long of grey discolored ceiling. No living space above the bathroom. The "stack" on roof (where toilet vents) was damaged, so roofer will fix. So, should I just leave it the way it, and maybe put Kilz on it, OR remove the drywall from ceiling, check/clean and replace? Thanks.
also a few tiny dots of black mold left, but mostly just grey discoloration now.

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  1. PAULSC says:
    December 12, 2010 at 5:00 pm

    If the sheetrock of the ceiling was saturated with water, it can be pretty difficult to completely dry the ceiling, including sheetrock, joists above and any insulation above the ceiling. But until all of that is bone dry, mold will continue, and remain hard to cover, even with a mold sealer like Kilz.

    If you want to fix the problem right, cut away the damaged sheet rock, remove any soaked insulation, dry any joists throroughly (a week or more of exposure to dry room air or with heat guns), and use bleach solution on the joists to kill remaining surface mold they may have. Dry the joists again thoroughly. Replace the sheetrock with new material. Tape, sand, prime and paint. Re-insulate with new insulation.

    Update:
    "… How do you know if mold is underneath ceiling? There are also yellow stains on different ceiling from air conditioner condensation. Could there be mold under that, too?"

    If you have attic access above that ceiling, the best way is to get up into the attic, locate the area, and inspect it from above. You can pull back any insulation bats or loose fill, and carefully examine the backside of the sheet rock, and any joists, studs or supporting woodwork in that area, before pulling it apart.

    Since you say this is as a result of a roof leak, I am assuming there is no finished living space or attic flooring above the area. If there were, I would have expected that flooring to have stopped the leak before damage occurred to a ceiling, but if the leak were going on a long time, or occurred next to a chimney or vent pipe, you could have bigger problems.

    Some people will try to do mold inspections by drilling small holes in the affected area and probing with a fiber optic scope, or a small inspection mirror pushed through the inspection hole. It’s true that it is easier and cheaper to repair a small inspection hole than to replace a larger section of sheetrock, if you find no extensive mold damage. But if you are getting heavy black mold visible through your existing ceiling paint, you may be past that point already.

    Part of this is estimating the severity of the problem intelligently from what you can already see, and having the will to open the area and investigate what repairs your really need to do.

  2. an4rew1 says:
    December 12, 2010 at 5:00 pm

    The mold sprayy will remove most of it but then you need to seal it with a solvent. I recommend Zinsser’s B-I-N

    Then paint over it with a bathroom or kitchen specific emulsion for better protection.

  3. Laura R says:
    December 12, 2010 at 5:00 pm

    If it’s all the way through the drywall, you would need to replace it. If it’s surface, bleach will kill it and remove most of the stain and then use Kilz primer before re-painting. Make sure you open a window before using bleach to clean though. Even if you use a ratio of 1/3 bleach to 2/3 water.

  4. brthrRay says:
    December 12, 2010 at 5:00 pm

    Kilz or B I N

  5. donna L says:
    December 12, 2010 at 5:00 pm

    I would suggest that you need to find out why the mold is there in the first place. Maybe you need more ventilation in the attic maybe the insulation is holding water. I would cut it out and replaced that part of the ceiling. if not it is like putting a band aid over the oil light in the car when it goes on ..

  6. winfried c says:
    December 12, 2010 at 5:00 pm

    use common household bleach dissolved in water .
    after that use clean warm water to wash it clean .
    problem solved .
    it,s just that easy .

    in extreme cases you have to replace the ceiling .

  7. richard m says:
    December 12, 2010 at 5:00 pm

    First of all vinegar is the best to try.

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