I watched a video the Beekissed posted regarding deep litter and ventilation. After PMing her about it, Im deciding to go that route. I bring it up because her coop is just alittle hoop house that really has a bit of ventilation. Way more than I would expect but because of how she does this true deep litter method, theyre thriving, an also shes not far from me so our winters are the same. So, Im deciding to instead putting up plywood for a wall, Im going wire. Theres wire mesh I thought about, still am, but I just may use the welded wire I have. Im not sure what you guys are considering hardware cloth. Chain link? Mesh? That mesh can come in pretty tight. No mouse would get thru. Its essentially heavy duty screen. Anyhow, I may not make it Fort Knox in regards to mice. Rats, different story. I'm still mulling it over in my head what Im gonna do. Unexpectedly today, I scored 5 leaves bags of essentially forest floor, the debris that you would find on a forest floor. Thats what this lady uses. Her coop smells like the woods, and its certainly natural for their needs. If anyone wants to see the link, I'll find it and post it here.