The Attic Insulation Minneapolis will simply need to be updated, as many years of natural wear and tear can cause substances to erode and lose their effectiveness. Another common problem has to do with birds, bats, mice, and other pests that tend to enter the home via the roof or top floor of the house. These unwelcome visitors may actually chew or eat the material used to insulate your home, leaving holes and gaps in your attic insulation.