Hey! Here's another surefire solution: Collect a few bucketfuls of Tiger urine. Mountain Lion urine will also suffice in a pinch. Sprinkle it around all the areas where you fear rat penetration might occur. Wait 24 hours. Then sprinkle it all around the edge of your entire property.

Rats are terrified by the smell of Tiger urine, and they will flee the area. You will need to renew the Tiger urine only about once a month to remain rat-free.