Yeah, I'll try to look it up. A friend of mine put up a snazzy looking pergola deck cover, 24"oc, with some carved projecting ends on the joists slightly sticking out for a kind of trellis look. I think he had the contractor add some space-age tough clear sheets on top, with UV inhibitor, which I think were made by GE Plastics. I think they were in 14 foot lengths, and about 24 inches to 48 inches wide. I think he said he used rubber gasket nails to hold them down, and had several inches of slope so that the water drains nicely away from the house.