Layering Up: A lot of pergolas will only have one layer of overhead beams say going in a vertical direction. One way of adding more shade and roofing to the pergola is to add another level of beams this time going in the horizontal direction as
A clear plastic roof may be just what you need. You can get clear corrugated roofing at your local building supply store or try something a little different. The material in this photo is inch thick honey comb plastic from Tap Plastic.
Free standing pergola with polycarbonate roof panels to keep out the rain and to provide shade: BABE, this is my favorite one so far, make it to fit the cement, then towards the pool, have an open sky top so grill smoke can escape