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Old 03-18-2011, 07:45 AM   #16
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Black mold on plywood subfloor


Kilz is not and shouldn't be used as a mold killer. Use a fungicide. Kilz can be used as a sealer or stain blocker afterwards. Blindness would be an extreme and rare result of mold exposure. The vast majority of household mold related illnesses are allergenic in nature. Some susceptible people may complain of respiratory problems. And even those are not common in normally healthy people. Occaisionally skin irritations. Dry sanding an active mold colony is not something to do. Treat it first, Scrub it, then dry it. Sand it after that if you need to correct any surface problems for appearance. Then seal it.

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Old 05-24-2011, 06:31 PM   #17
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Black mold on plywood subfloor


I am in a mobile home with what looks like the exact mold situation in one of my bathrooms. I've just had my bathroom linoleum pulled up and it looks like the pictures. The mold covers the space between the tub & toilet which are beside each other. I think it may have been a leak in the toilet that went undetected for some time. At one end of the tub/shower is a wall between my son's room & the bathroom where we 1st noticed some water & mild mold that seemed to be coming under the wall from that bathroom area. Now the room on the opposite side of the bathroom is beginning to show a long upward ridge near that connecting wall.
I'm not sure ,but some things , like the levelness of my double wide mobile home, has been affected by having moved the home from one mobile home park location to another. This is the time when I notice the ridge in the flooring of the laundry room (don't see any mold yet) and the mold which originated seemed to grow a lot more & rapidly. Also, the lot I was rented allows some water to get under the trailer in heavy rain storms.
I have virtually no budget to handle this so any input/advice would be greatly appreciated. I've learned some by your previous comments on this subject.

Thanks, M.D.
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Old 05-24-2011, 07:10 PM   #18
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Black mold on plywood subfloor


You've read several points of view in the previous posts. The only thing I would add is to make sure you take care of the initial moisture or water issues. Make sure any leaks are fixed and you have an adequately sized fan in the bathroom (and use it!), etc. If you replace the floor etc. but don't stop the moisture or water from returning you will get the mold back.
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Old 01-21-2013, 02:10 PM   #19
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Black mold on plywood subfloor


ok about black mold, its porus so it needs air,water and a feeding source...such as drywall or plywood, paper and other items. We live in Florida, and in our home we were going to put new wood flooring in. Until we found black mold, since then we rebuilt 20 ft of exterior wall and a complete rebuild of our 2nd bathroom. When it comes to bathroom flooring if you found mold along the edges and the floor is raised, its holding moisture....i would be guessing OSB board. I would replace it and paint it with a mold and mildew barrier before placing the toliet or anything. Make sure you use a roller and put two coats on....the first coat will fill cracks and any offsets in the plywood, the 2nd coat will seal it. I have dealt with cleaning agents, and ect. mold will return if its not removed and properly prevented. When you pull up the flooring examine the floor joices. On the walls, i would use Green board, its sheetrock with a thick mold n mildew prevention barrier and its only a couple dollars more then sheetrock. i hope this helps.

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