We had to replace the flooring in a mobile home we're selling and we had to put some moisture barrier under the wood laminate. We had a roll of the stuff left over when we were done so I decided to use it on the coop. Our tarps are woven and tend to get leaks and shred easy, well this stuff is a thick plastic. It doesn't have grommets on the corner, but you just double over the edges and put a tiny hole in it and fasten with zip ties. The stuff is like 12' wide. It's folded over on the roll, so there are indents where it's been folded, to make it easy to cut (in straight lines!). It was about $15 a roll and could easily cover my coop run of about 12' long by 6' tall. We did the walls AND roof! If I think about it I'll grab photos.