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The log home I recently moved into near Frederick, MD, was built in 1986 and the original roof needs replacement. I'm not certain that the problem I'm writing about--small brown or black dots proliferating on window sills and other surfaces--is directly related to the condition of the roof. The spots, or dots, are easily rubbed off. Varnish? At first I thought they were from insects, but a pest inspector said probably not. The most baffling thing is that some of the spots are not in a direct l


Sounds like it could be mold from wet wood. Not sure without seeing.

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Posted By Fred Geiger
To complete my query: The most baffling thing is that some of the spots are not in a direct line from the ceiling. E.g., some are on a lamp base; others are on windowsills beneath (non-moldy) window ledges.