In article ,

I wrote:
If you also tighten up the building with hardware
cloth and polyurethane foam that provides another level of slowing them
down, and keeps the building a bit warmer as a side effect. Cleaning up
as much other clutter (mouse hiding places and nesting supplies) as
possible will also help.

Ignoramus26924 wrote:

mice chewed through my polyurethane foam...

That's why you put hardware cloth in place before foaming.

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Cats, coffee, chocolate...vices to live by