I have trellises as the "walls" of my shade shelter and they do very little to block the wind or sun but they are really useful for hanging and mounting orchids on. What I'm thinking about doing is hanging some shade cloth on the outside of the trellises for additional protection from the wind and sun.
My shade shelter is covered with 50% white shade cloth which lets in a lot, almost too much light. Personally, I wouldn't want a fiberglass or any other type of impermeable roof because all of my orchids are mounted and they respond very well to the rain on those rare occasions it does rain. But, your area is somewhat cooler than mine so they would probably appreciate the bump in temperature. Although, I'm not too sure how large that bump would be.
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