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Flies in insulation

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Cellulose insulation. Found many pencil size holes and lots of dead flies. Ever heard of flies digging their way through insulation?

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Those are cluster flies. They're very common and quite harmless - aside from their great numbers. The usually gather themselves together in bunches, but sometimes, they burrow into insulation to pass through cold spells.

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.............in the 70's I owned a country home with balloon framing. The old couple that originally owned the place, swept the attic floor clean of dead cluster flies into the wall cavities. When I stripped plaster from the main floor, the exterior walls were 3 feet deep with dead flies. I still remember the smell......Greg

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