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.

  • 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
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    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
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    Carpenter ants like to tunnel through some insulation types. It's easier for them than wood. :-) – Jay Bazuzi May 13 '12 at 15:59
  • I had carpenter ants eating the foam ICF blocks below grade I wasent worried about the structure as I had metal flashing that they could not chew through, I ended up having them professionally removed as there must have been thousands a dust pan full every day of the tiny foam pieces. I had 65' of wall below grade up to 11'. the company used 35 gallons of some really toxic stuff (10 year guarantee) it was expensive but 2 years later there was no more mess. + jay – Ed Beal Jan 30 '19 at 21:26

Carpenter ants, they did the same in my insulated (Styrofoam) garage door. They attacked one door but not the second. I stopped them with Sevin dust but it needed a couple months. I just sprinkled it on the floor where the door touched ( because it is "flea powder" it is very low risk to pets.)

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Carpenter Ants are making it a new home.

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    This could be a luck guess... or totally wrong. There's as yet no evidence in the original post to suggest this or any other specific cause. – aaron Aug 24 '15 at 13:44
  • Please update your post to explain why you think it could be carpenter ants, how the OP could identify them, and what to do about them. Thanks! – Niall C. Sep 4 '15 at 15:19

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