Seems like I remember many years ago hearing it was not a good idea to build bird houses with pressure treated wood for various reasons (birds don't like it, chemicals not good for birds, etc.). If that is the case, is there a problem with using some PT wood while building the chicken coop? I've used 4 4x4 PT posts for the 4 corners of the coop and a few PT 2x4s to build the outside frame. The rest of the wood was all recycled NON-PT 2x4s and I covered the outside with 100 year old barn wood. Any ideas of the PT wood being a problem for the chickens? Thanks in advance!!!