To save a buck, I got some old metal roofing from a friend for free. Only catch, it had a small hole or two in it. I put it down tonight and patched the holes with thick roofing tar. Then to seal the deal, I put the tar along all the seams. I never gave it a thought. Is this going to be OK? Are the chickens going to be affected by the tar fumes? They aren't in there yet, probably be at least this weekend before they're in. Also, I should have thought again. I used some of that "great stuff" expanding foam sealant to fill in a couple of cracks. Will that hurt the chickens?