I have a 22'x16' shade sail like the one found here.
I have 4x4x12' (pressure treated) posts that I wanted to use for each corner. I will be pouring cement and using simpson post base brackets and bolting the post to the bracket (I am not sinking the post in cement).
My question is, will the tension on the sail pull the 4x4s inward too much or should I go with 6x6? To get the sail to not sag, you use turn buckles to tighten the distance between the sail and post. I know this heavily depends on how tight I make the sail. Any insight on this?