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Really liked your question about the wood, and you chicken long term eggers can help newbies like me. Like most it is easy to see danger were non existes but who is to know for sure.Hello and welcome to BYC!Glad you joined.
Why didn't you use PT wood for the run walls? With the climate you describe I can't imagine them lasting very long. Where will the access door be to get into the run?
Does water come in contact with the pt wood and birds drink the water.?It's perfectly safe for them. They don't eat it and don't come into contact with it.
Usually penned birds are provided with drinkers. Any water that was temporarily in contact with the PT wood then hit the ground would soak in. Any puddles may be drunk from but these would also contain chicken feces, parasite eggs and bacteria at a much higher concentration than any minute amount of Cu salts that may leach from the wood. It would take much more than that to reach cooper toxicity.Does water come in contact with the pt wood and birds drink the water.?