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black spots on exterior walls

Posted by erin on December 26th, 2001 05:06 PM

On the bottom of the exterior walls on half of the house we have black spots. I was told it's because we have no or little insulation. half of our house has a dirt floor crawlspace and the other was dug down to allow for about a 5 foot crawlspace, but is concrete. There is no black spots on any walls above the dirt floor crawlspace. Some over our walls our cheap wood pannelling strapped onto the original plaster, with about a 1.5 inch gapbetween walls. the other walls are plaster and i believe paperboard. Is there any other cause for the blackspots? Its not mold, thanks for any suggestions

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