Smokerbill
Crossing the Road
I have a similar setup but my sliding door and the rope are all inside my coop. I normally get lots of snow here in northern Minnesota and I knew that I would be better off with the sliding door inside the coop, as well as the rope system because I did not want to have to deal with a frozen rope and stuck pop door on the outside.
My coop is totally protected from rain and snow since the entire thing is underneath an overhanging metal roof. Because of that I was able to use flat sections of OSB for the roof the coop. No need for a waterproof, slanted roof.
I designed my coop to have the big doors in the back. I have to open them to access the food and water the the pop door rope - which are all inside the coop. I don't actually have to go into the coop to service the daily food and water, and the rope is right at the inside door opening.
The secure run is on the opposite side of the coop, and I leave half of the coop wall on that side totally open 24/7, a big 4'x4' opening for chickens to go in and out of the coop from the secure run. It provides for a lot of ventilation, too.
My sliding pop door has only frozen shut a few times over four winters, even though it is inside the coop, but I can only imagine how much it would freeze if the sliding door was on the outside.
No rain or snow can touch the coop, so it'll never freeze shut.
I considered doing that, but I'd still have to go into the day run, sidestepping poop bombs on the woodchips. I want to be able to access the pull rope that controls the pop door from outside the run.But I can understand what a pain it would be to have to screw on/off the pop door each time. Is there some reason you did not put the door on a simple hinge and then use a hook and eye to hold it in the open position?
The door I use to access the day run (the human door) is simply a pallet standing on edge. It's "hinge" is a single loop of rope that attaches one top corner of the pallet to a post. Extremely low tech. LOL. I'll get a picture of it as it is now. I'll probably upgrade it to a door of some kind with steel hinges someday. But so far the pallet-door has worked just fine.