Billboard or other Vinyl roof cover

[Pacific Yurts]

There are many different types and qualities of vinyl fabrics. Cheap vinyls are typically not stable materials and release toxins (much like cheap shower curtains) under normal use. I suspect the difference between your two billboards is the quality of vinyl used. One sign shop used a better product than another.

There are lots of different fabrics that are considered "vinyl coated polyester". Most fabrics by this description are woven fabrics with a fairly light vinyl coating (similar to the acrylic coating on our polyester side covers) that is applied as the fabric is run through rollers, to help embed the coating while it is in a liquid state. These fabrics are typically sewn rather than being welded using heat or radio frequency welders.

Fabrics described as "vinyl laminated polyester" or "coated vinyl" are often made from higher quality materials and are less likely to off gas. These fabrics usually have a polyester scrim (rip-stop) that is embedded in the vinyl, so they are strong as well. These will be more expensive, but fire rated, strong and long lasting. Their fire resistance will usually be integral in the material rather than a coating that is applied onto the surface of the material (i.e. It can't wear or wash off).

[Foxnsox]

Thanks for your help, guys. I'll get a couple of yards first to see how it does. It does have some sort of fire resistance in it. Hopefully it's a decent product.