So my coop is about 25' x 25' (rough estimate) and about a quarter of it in one corner is walled off. I think it used to be a feed storage room. This coop used to be used as a coop about 10 years ago by the last owners of the house, but it has been used for storage since. There are bits of plastic and cardboard trash on the dirt floor and I've been trying to rake it all up, but I don't think I can get all of it, so I decided to uses my dad's little electric tiller to mix the dirt up and then cover it up with pine shavings. The problem is that when I tried to till the little storage room I found out that their is asphalt about a centimeter under the dirt. I didn't realize this at first, so I have already used the tiller to break up about half of it. :/ Should I leave the rest and cover it with shavings, or should I break the rest and then cover it with shavings? (after picking up all the bits of asphalt) By the way, I'm planning on letting my chickens live in the storage room until I finish the outer part.