How do Roof Rats Get into Attics? These little guys are relentless! If there is a crack, they will come in. Usually there is more than one. Because roof rats incisors constantly grow, they constantly chew and gnaw to wear them down. As you can see metal won't stop them. If there is a crack in the wood, they just make it a little bigger. Roof Rat Control in Virginia Beach The best way to control roof rat population is exclusion. Critter Control of Virginia Beach specializes in identifying all current and potential entry points and securing them. If your hearing chewing at night or noises in the attic call us immediately to mitigate any roof rat damage to your home.