On your roof seal off openings such as vent pipes.
Roof vents and rats.
One common style of vent that is located on the roof is commonly called a j vent.
Use a heavy grade of steel wool copper mesh or metal scouring pads to fill cracks and holes in exterior walls.
The soil vents also known as a vent stack can let rats into your home.
Rats often enter homes and business s through vents located on the roof.
Especially on a roof where you will have difficulty getting up to clean it.
These entry points need to be sealed in order to prevent rats from entering the structure through roof vents.
Your best bet might be to extend the duct a few feet above the roofline to make the vent inaccessible to rats.
I actually don t think this can be done legally.
Rats can easily climb pipes rain spouts cables and other vertical objects where holes can provide an entrance to your home.
Rats climb down and get into your plumbing system and get into your home through the toilet.