I'm building a pergola over my existing deck. It measures 12 x 17. The longest beams I can find at HD are 16' therefore I'll have to join 2 beams in the middle post. What would be the best way to join them?
What are you building the rafters from? If it's PT, then they will undoubtedly twist and warp all over the place unless you tie them together. I've seen them on all centers from 12" to 16" to 24". it's all in the look you want. Toe nailing should be fine. The only load they will bear is their own weight.
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