tcsii skylight flashings. photo by william lemke; courtesy of super sky and linetec. skylights. dayliter skylights – roof door glass. skypod upvc skylights for flat roofs. velux motorized operables sloped. looking down a bit, it\u0027s more clear that the roof is a series of ribs of two basic shapes \u2013 bent back at the base and bent back some ten feet higher .