The goal for rodent exclusion is to keep the rodents out of your home. Once a rodent accesses your crawlspace, attic, garage, or other wall or ceiling void, they have complete access to your home. The construction materials used on the inside of your home are easily gnawed through or bypassed. Rodents will also follow water, electrical, HVAC, and other utility lines to easily travel throughout your home. You must seal the outer walls and/or roof where building materials are more durable and designed to withstand wear and tear.