What size hole can a Norway rat enter?

This video shows how quickly a Norway rat can enter a small hole. A Norway rat can enter any hole they can fit their head. Holes the size of a quarter rats can use to enter a structure. This video is from a basement. The basement has a stone foundation wall with missing masonry. It is important to maintain your foundation wall. Stone, block and brick foundations need more maintenance to keep the joints pointed and secure inside and out. Norway rats get inside quickly with a colony near the foundation. The burrow system of the Norway rat extends underground and usually follows existing structures like sewer, electrical conduit, gas and water lines. Those pipes and structures make it easy for rats to create runways between burrows. Finally, sewer lines are important to rats. Rats need a drink of water every day.

Rodent droppings are dangerous. Never vacuum rodent droppings. Spray rodent droppings using a disinfectant, sanitizer or virucide (DSV). That kills harmful viruses carried on them. Next, use a paper towel in a gloved hand to dab up the droppings and dispose of them in a trash bag.

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