Would love to know everyones thought on this. We'd like to insulate our coop and intend on sandwiching insulation (a non-toxic styrofoam type) in between siding and OSB on the inside. I'm concerned about formaldehyde emissions from the OSB. I realize ventillation is a big factor in this concern... but we want our girls & eggs to be healthy and free of as many toxins as we can avoid. If OSB isn't a good idea, what are some other cost-effective materials we can use instead?