I'm not really sure about rats. Like RonP says, if a rat wants in, it's coming in. The most efficient way to address that issue is by eliminating the rats. Easier said than done, I know, but as The Bard aptly put it, "Therein lies the rub!"
Our main issues here are a persistent fox who digs...
When we converted our playhouse to a coop and run, we tried to use a lot of materials we had on-hand. One such windfall was a small pile of concrete mix bags from an aborted patio project.
We dug a trench, about 8 inches deep and wide, all around the base. My son then dumped bags of dry...