I used this over an old 12'x20' metal carport frame that had been given to me without any of the fabric on it by someone who didn't need it anymore, and was happy to get it haulef off. I have no idea what brand the frame was, or even where it was purchased, but since the measurements matched the listing for this I figured it was worth trying. Turns out this was EXACTLY the right size to fit it, and it went on easily and yet snuggly both. I am currently using a repurposed swimming pool cover for the roof, but I'm planning on picking up the actual roof piece from this same company, since I already know the size will be correct, and the prices for their components are very reasonable. The quality of the material seems as good as any I've seen on these types of shelters, it is definitely rain proof, and has survived some pretty hefty wind and rain this monsoon season with no damage. I would have liked to have seen some tie loops or at least grommets along the bottom edge for securing the bottom edge to weights, but I accomplished the same thing with some inexpensive tarp clamps and some cord tied around some big logs on either side. I think this is an excellent, well made replacement for a 12'x20' metal framed garage, and can even turn just a carport with only a roof into a fully enclosed shelter for a low cost.