This may be next to impossible given Portland's rat problem... I don't want to try to roof over my run, It's too big and I'm too lazy. But if there's an easy, rat-proof way to cover 500 sq ft, I'm listening... My chicken run is in an L-shape, bordered on several sides by my house, gate, garage and my neighbor's garage. I fenced in that area with chainlink kennel fencing, and my coop is 6'x12' chainlink attached to one of the chainlink walls (has a roof and wooden hutches/cages, but the birds all roost on the hutch roof since it's highest. lol) The rats seem to come in between my garage and my neighbors garage - there's about 18-24" of cedar fencing and they come in between the fencing and the buildings or underneath, so I'm going to cover those openings over with hardware cloth (I read rats can squeeze through chicken wire, is that so?). They're cheeky things, I've heard them squeak while I'm in the run after dark! I'm also running electric wire along the top of the chainlink and am considering continuing along my neighbor's garage wall and across the top of the cedar fencing if they decide to come over (once the under and around is blocked off). I may even run it along my garage walls all the way to my gate if they come over the garage roof. Any other ideas on how to keep them out? I trap them and more come, and some are smart enough to trip the traps. I figure there's an unending population out there. Not interested in poisoning, in case the chickens find and eat a poisoned rat. I'm trying to make the run secure enough so that if I want to go out of town for a night, I don't always have to hire a chicken sitter to let them in and out of the coop. I figure it will take the neighborhood predators (rats, possums, maybe a raccoon) that long to realize the dogs aren't there - they catch anything that dares step foot into the yard, good whippets! . Thanks.