Nobody likes having rats in their home, so it’s a good thing that there are fairly clear signs of a rat infestation so that you can get rid of these pesky rodents before they cause costly damage. Rats are chronic chewers. They chew through everything — walls, wiring, flooring, insulation, ducting, etc. If a rat infestation gets out of control, it can cost thousands to repair the damage. They also carry dangerous diseases that can cause health issues to people in the home. So, if you see any of these signs of a rat infestation in your home, it’s important to seek professional help right away.