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Old 01-03-2019, 07:00 PM   #1
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Finishing Basement Wall

I am planning on remodeling my basement in Ohio. Their is no active water problem, as a perimeter drain was installed on the inside, assuring that the concrete block will drain.

If the concrete block were unpainted, I would just attach foam board directly to the block, put furring strips on top of that, or finish with drywall or possibly cement board. The cement board is harder to finish, but once done would have the advantage of making sure nothing down there could support mold growth except for possibly the finishing coat of paint.

Unfortunately, the walls have already been painted some time ago. Some of the paint seems to be oil based, some of it seems to be latex, as there was a bit of mold near the bottom of the wall.

l suspect that, even with a good perimeter drain, if I cover this latex paint, eventually, it will grow mold.

If I cover the walls completely with foamboard, and then seal the foamboard very carefully with expanding foam, is that enough that I don't need to worry about mold eating the paint?

Someone suggested that I prime with Mold Killing Primer, and then paint with Zinnser PermWhite mold preventing paint, and then cover with the foam board.

My concern is that this is still a latex paint product, and even with the anti mold additives, the mold would likely still eventually start to grow on it.

Should I paint or not, and does this sound like a problem installation? Are their better solutions? I know that one option is to build a stud wall several inches from the existing wall, allowing airflow behind the wall to prevent mold, but this seems like it might actually allow the surface of the block wall to get colder in the winter and promote condensatiion.

Any advice would be much appreciated.
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Old 01-04-2019, 04:47 AM   #2
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Re: Finishing Basement Wall

Originally Posted by cbixel View Post
I am planning on remodeling my basement in Ohio.
Any advice would be much appreciated.
2" XPS against the wall;

2x4 framing in front of the XPS;

Roxul Insulation in the framing.
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Old 01-04-2019, 09:26 AM   #3
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Re: Finishing Basement Wall

Again - check with local building inspector regarding whether vapor barrier is required - local code rules
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basement , mold , permawhite paint

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