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We have noticed that there are piles of the tiny particles of the insulation from one of our garage doors on each side of our door. At first we swept it up and didn't think anything of it. The next day there were piles again! It just keeps happening. Any idea what might be inside of the door eating the insulation or just moving around inside of it to have it pile up on the floor? So strange.

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At the very least you have to specify the insulation material. Photos of the piles (and other damage if you can see it) could also be helpful. –  sharptooth May 12 '12 at 7:21
The most obvious explanation would probably be mice or rats. –  ChrisF May 12 '12 at 9:58
look for evidence of mouse droppings(small dark pieces similar in size and shape to cupcake sprinkles) along the walls and in the corners. –  mikes May 12 '12 at 13:04
Carpenter ants like to tunnel through some insulation types. It's easier for them than wood. :-) –  Jay Bazuzi May 13 '12 at 15:59

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