Has anyone used the deep litter method with a small flock? I plan on having only 3 girls and have read mixed things about deep litter and a small flock. I do like the idea that the deep litter will help the coop insulate itself as I live in Alaska, but don't know much about the associated downsides to that theory either. With deep litter method requiring more ventilation, will that actually make the coop colder in the long run?
Take this however you want, but knowing that I have read this entire thread but do not have chickens, I also know a good bit about composting which is what deep litter is at a basic level.
Your bedding is a Carbon based, wood products, dried grass (hay), straw, leaves are all carbon. Left in a dry area with no nitrogen added they will not break down at all.
Chicken poop is a moist, strong nitrogen which will break down a certain amount of bedding per poop (compost needs 2 carbons to a nitrogen, so a cup of chicken poop should break down up to 2 cups of bedding over time) but deep litter also needs a little moisture in the lower levels to keep it working.
If I were to do a small flock like that, I would start in the spring if possible, and put a fairly light level of bedding in the coup, keeping a good mix of things but mostly things that break down faster, more grass and leaf types than pine shavings, when it starts getting covered, toss a few more handfuls in on top of the poopy bedding, so you make layers, bedding, light layer of poop, then bedding, until you get it close to the depth you want. Also, if you can get away with it without it freezing instantly, I would empty the water into a different spot in the floor each time you empty it, let some of the moisture go into the bottom layers. if it stays really dry, it won't break down, but it also shouldn't release too much ammonia either.
So, maybe cook it good and keep it moist in the "warm" weather with lots of ventilation and then close it up and dry it out some for winter.
You do still want to have good ventilation in the top of the coup even in the winter, chickens "steam" in cold weather and that moisture being trapped against their skin is what causes frost bite, if you keep the ventilation good, then the steam will just drift up and out and not bother the chickens.