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Old 08-18-2011, 09:28 PM   #1
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Wow - I see why people don't use plywood as basement subfloors


I am framing my basement and threw a couple pieces of plywood on the floor so I'd have something to assemble the sections on. That was about two months ago, and I noticed white mold growing on the tops of the boards.

I picked the boards up today - looks like something you'd see on Hoarders! Just solid green and white mold. Imagine if that had been a subfloor - by the time it came up and ruined whatever was on top of it, your whole basement would need torn out and bleached.

Just though I'd share, in case anyone is thinking about using plywood subfloor over their concrete. I'm not sure I'd even trust a plastic moisture barrier, cause one hole and your back to mold eating your floor.

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Old 08-19-2011, 02:06 AM   #2
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Wow - I see why people don't use plywood as basement subfloors


Don't even need a hole in the plastic. Mold will grow under it,

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Old 08-19-2011, 07:28 AM   #3
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Wow - I see why people don't use plywood as basement subfloors


I guess it depends on the amount of moisture in the basement? I have plywood subfloor on top of Delta-FL. It has been fine.

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Old 08-19-2011, 08:49 AM   #4
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Wow - I see why people don't use plywood as basement subfloors


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Originally Posted by leungw View Post
I guess it depends on the amount of moisture in the basement? I have plywood subfloor on top of Delta-FL. It has been fine.
For how long? And if you can't see under it, you can't be sure there is no mold.
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Old 08-19-2011, 09:21 AM   #5
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Wow - I see why people don't use plywood as basement subfloors


Yes, I cannot be 100% sure. The subfloor was installed in the beginning of this year. I still don't have anything on top of the plywood yet, so I can only inspect the top side.

Prior to that we had been using the basement strictly for storage. Cardboard boxes were stacked on the concrete floor for years. When we moved the boxes upstairs, the bottom of the boxes were all clean. So my basement seems to be very dry compared to the OP's basement.
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