We are preparing for our first chicks (six or so Brahmas) and I've been tasked with building the coop for them. After doing some research, I think we're going to start with an Ark. Specifically, I am planning on building something along the lines of the Boughton 903 just a bit bigger. (We want to make sure they have plenty of room within the run.) I found this thread where dealhoud was doing something similar, which was already quite helpful (thanks dealhound). I am curious about the wood we can use for something like this however. It was noted in the thread I linked above that treated lumber was used. This was dismissed due to his believing that poisonous materials were not used, but last I knew they do still use arsenic in that treatment. We definitely never use them for things like our raised garden beds where they can potentially harm the food we eat. I'm not willing to risk them on our chicken coop either. I was going to use Cedar, but some of the material we've been studying warns against using cedar shavings for the litter because it's harmful to the chickens - but it doesn't really go into why. Is this specifically in litter, or a side-effect of the shaving process? Or should I avoid cedar materials entirely? If so, what kind of wood do you generally use for your coops that you have found to be the most durable for that purpose?