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The green board are there for addition horizontal sway support, not just for screws.The green ones are there so the purple ones have something to be nailed to.
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I was just wondering the same thing. I would think all the moisture would cause warping?Might be a dumb question, but where does treated lumber fall in all this? Is it toxic or hard to stain, easily warped, or something? I have a chance to get all the stuff I want, for free, but if it's no good structurally or then I'll pass.