That is what I did. When weather is dry the chickens like to scratch down to the dirt. When the weather is wet the wood soaks it up. Bonus, all the poop washes down through the chips fertilizing the ground underneath as the chips directly in contact with the ground decompose. Come fall I'll dig some of that soil up and spread it on my gardens. Come spring my gardens are already fertilized and ready to plant.My big concern with my run is that when it rains a lot (I'm in East Tn. so it isn't a concern most of the time) my run area (not finished yet and won't get chickens for a couple of weeks) will be like a big puddle. Should I cover it with wood chips?
Start with about 2 inches unless you are expecting your run to be really wet. Then go with at least 4. If you're in a dry area dont bother, let the chickens eat the greenery first. When they finish it off and it gets muddy try the chips.