I'm going to jump in here and state up front that I have NOT set up my chicken situation yet. However, I'll put this out there for what it is worth.
I own a high risk cleaning business. I do surgical areas, crime scenes etc.... One of my clients recently painted the surgical areas with an epoxy paint from Sherwin Williams I can literally hose down with a sprayer. It seals that well. Forms a hard surface and is completely moisture proof. It is pricey, like $80 - $100 a gallon. Also, very slick so not good on floor boards.
Now, more experienced chicken keepers
KNOW way more than I do, so I'm not sure it would be appropriate to use this on the inside of the coop (do chickens peck paint off walls?) as opposed to a water seal type treatment. So, I'm hoping they will jump in here

Because, if this would work I'm willing to spend the money. I would think that a well ventilated coop would be a must since the humidity/moisture would build on the paint and run down the walls if it gets high, but I can guarantee that it won't soak into the walls. Which would allow for almost perfect disinfection if you needed it.
I love bleach as a disinfectant, but just from experience and a caution on using bleach with wood. Bleach would soak into the wood. If bleach at a 1:10 water ratio is all you'll ever use in the coop, it's fine. But, if you take a window cleaning type product (or anything with ammonia) into the coop to clean windows you have in it.... you could be in for a real bad gaseous treat,
ammonia and bleach DO NOT mix. The chemical reaction, if large enough (which I doubt would happen in the coop, probably just a small reaction around the windows), can kill you, so open the windows! So, with a small minor reaction I would worry about the birds. I have parrots and it wouldn't take much. If roasting bags are toxic to birds when used in an oven across the house, the reaction to this in the sleeping quarters doesn't sound good to me. I'm going to read my chlorahexadine bottle I use on my dog kennels to see if that would work as opposed to bleach.
Sounds alarmist I know, but just something to keep filed in the back of your minds. Not likely to happen, but good to know about.
Charlotte