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How to build a treehouse

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Step 8: Attach platform to supports

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Now use the rafter ties to attach your platform to the 2 x 10s that you screwed to the tree (if the angles between joists are not exactly 90°, no problem, just hammer the rafter tie flat against each joist as you're nailing). Add the joist hangers. Use galvanized nails to attach these, not screws.
 
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bustedit4 years ago
why cuz nails and not screws? is that to allow for movement, again?
makendo (author)  bustedit4 years ago
Joist hangers are designed for nails because they have much better shear strength than screws of the same diameter (not to mention easier and cheaper to use). They make a very secure joint that doesn't move at all.
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