I've been wrestling with coop plans and have pretty much decided to build a 16 X 12 building with the nesting/roosting/play room being about 16 X 8 and a 4 X 8 workroom/storage room. I made up a materials list and did a subtotal of the estimated costs of the bigger ticket items only, like the siding, and the flooring and the framing, door and windows. It came pretty close to the cost of one of those Amish made pre-fab garden shed type buildings. But before I get all involved in modifying the interior, putting in the nesting boxes and roots and ventilation and etc. I wanted to know if anybody on this forum had any experience with these buildings as chicken sheds. One thing I also wonder, the entire building, including the floor is made of treated lumber. Any problems with chemicals in eggs?