How do I put a waterproof cover over a pergola?

Christina Ladd
by Christina Ladd
I have a pergola attached to my house that extends out about 18 feet, and I would like to put a waterproof covering over it. It currently has a sunshade fabric on top since this area gets a lot of bright, hot afternoon sun. I don't want a full roof as I do want some light to filter through. What is my best, most economical solution?

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