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I'll be doing a small bathroom remodel on a VERY old house which mainly includes installing bathroom fan and a full paint job as the main tasks. On first walk through, I noticed that the house has visible black mold on the plaster walls and ceiling (I'm assuming this is plaster too...) inside of the combination bath/shower.

Along with the visible mold, the paint on those surfaces is deteriorating and badly peeling (which is the original reason I was called for painting).

I explained to the homeowner that since the original bathroom had no exhaust fan or proper venting, this was the perfect condition for moisture to build and mold to grow, so we added bathroom fan as a requirement. I said I would research ways to remove the mold and properly prepare the surfaces before painting.

I am thinking:

  1. Physically scrape away all peeling paint, and dispose.
  2. Pre-spray all areas with vinager, and let set for 1 hour.
  3. Deep scrub all areas w/ Borax or TPS.
  4. Fully DRY for 24 hours.
  5. Prime with KILZ.
  6. Paint.

Any feedback on this plan? Also -- anything special I need to do since the walls are PLASTER and not regular drywall?

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    Personally I’d use a strong bleach and water solution instead of vinegar, but some websites do list vinegar as a solution for mold removal. – Tyson Jun 6 '18 at 15:13
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    Chlorine bleach will kill mold better than vinegar and will bleach out the discoloration. Wear old clothes to use chlorine bleach. Spray it on is easiest, but if you don't have a sprayer then dab it on with a hand mop. Use neoprene or rubber gloves because it will run down the handle of the mop and onto you hand and arm. Let sit to kill the mold for at least 4 hr and then rinse off with a hand held the shower head. Do not add any vinegar over the chlorine bleach (before it is rinsed off) because it can evolve dangerous amounts of chlorine gas. – Jim Stewart Jun 6 '18 at 15:54
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    Redo with bleach if necessary and let dry. Scrape loose paint, prime with Kilz and paint. – Jim Stewart Jun 6 '18 at 15:57
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    You could scrape loose paint before using the bleach and then re-scrape after since bleaching may loosen some paint. No need to bleach paint which is going to be scraped off. – Jim Stewart Jun 6 '18 at 16:00
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    Purchase a 1-gal plastic garden sprayer to apply bleach. It will make the job so much easier and faster. Mix bleach 1/2 cup to 1 cup per gallon of water. Wear glasses and be careful you don't get too much inhalation exposure. – Jim Stewart Jun 6 '18 at 16:05

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