Ok, I know this is covered in a lot of places here. But, I haven't really found the answer to my question. So, I thought I would put it to the "powers that be"! My chicken friend, one who has done it his whole life, says not to use vinyl under the bedding in my coop. He asked me the question: what happens when an animal steps on a slick hard surface...? And I said it can cause the legs to splay...he said right. So, why do I want to put it in my coop? I told him I would cover it with many inches of bedding. Then he said, the bedding was still on a slick surface and will move when the chickens come down off the roost, especially if they jump down and not use the ramp. He told me that was one of the main causes of bumble foot...the repetitive landing on the ball of the foot. So....that's my question....to use or not, and if you see signs of bumble foot. Thanks all...can't wait for some answers!