re: Where to find 4in metal poles for sun shade sail?

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You're not concerned with those wood 6x6s warping over time with the constant tension?

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You're probably not wrong that they may warp some over the years but they've been loaded up for about a year and half now and haven't budged. When I load up the shade on the posts, the posts barely move. Probably doesn't hurt that they're loaded up along the diagonal of the post.

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Im having a hard time wrapping my head around how those simpson bases are able to secure those 6x6 with no movement. You are far more brave than I attempting that.

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Those things are beefy and can take some shite. You can only see about half of the base above the concrete and each one has twenty something screws in the post. I designed the pier similar to the recommended reinforced concrete installation from Simpson's catalog. My thought was that I might eventually go from a sail shade to a pavilion or pergola and I wanted something wooden that could handle the sail shade torque on it. Either way, a steel post is about as solid as anything you'll get if that's the answer. Just wanted to toss out there that there's a wood solution if you like the look better.