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Saw dust insulation

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On one of my inspections today in a 1920's home I find 6" of loose fiberglass insulation covered by what appears to be sawdust and shavings...I have never run across anything like this before. Which is what I told my clients, and that I would have no idea if it had been treated with any fire retardant (yes, those are bat droppings in the 2nd photo). Has anyone else ever run across this type of insulation?

Robert E Lee

Rochester, MN

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The color is lighter, but I see a lot of it here. It is usually a rusty color from the fire retardant and it was sold around here under the name SilvaWool. I'm sure there are probably other brands of the same stuff that were sold. Did you try to burn a little bit of it to see if it has been treated?



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