Rats choose insulation as nesting sites due to the warmth, security and protection it offers, making it an ideal habitat for them. Insulation materials like fiberglass or foam offer excellent hiding spots, shielding rats from predators and disturbances. These materials are soft, making it easy for rats to burrow and create cozy nesting spaces. Also,  insulation is often tucked away in dark, secluded corners of your home, providing rats with a secure and concealed location for breeding and raising their young.  If your home offers easy access through exterior gaps or cracks, these determined little rodents will quickly make themselves at home in your insulation. Usually, if you have rats, your neighbors will also. Rats tend  to migrate from one property to another, especially in the  case of infestations. Read on below to learn how quickly a couple of rats can turn into a full-blown infestation.