My house is 9 years old and has an unfinished basement. We heat our home with a "wood furnace", and do keep some wood inside during the winter. I started to notice the fine powder piles a year ago. I have done much research about the "beetles". But the one thing I cant figure out is why the only place there is an active "infestation" is between the joist where there is a heating duct up through the floor? The "sub-floor" is made of the manufactured plywood. There is some obvious damage to the 2X6's floor joists, but I worry if it might go deeper to places that I cant see.
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