Large rectangular opening in green exterior siding where copper and gray utility lines enter the house, partly filled with old orange expanding foam, with peeling caulk and tape around the edges.
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Large rectangular opening in green exterior siding where copper and gray utility lines enter the house, partly filled with old orange expanding foam, with peeling caulk and tape around the edges.

This photo shows a large opening in the exterior siding of a Plano home where the utility lines and line set pass through the wall. The old expanding foam inside is crumbling and the caulk around the edges is peeling, leaving gaps far bigger than the pencil width a mouse needs or the quarter size a rat needs to get inside. Rodent proofing seals a penetration like this with metal mesh and durable sealant so mice and rats cannot chew their way in.