re: Is it or isn't it a good idea to tie a pergola into a roof?

quote:

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If you are set on the 3 post design, I would add another joist across the hypotenuse and create a triangle shaped pergola. No matter how many screws you use on the unsupported/cantilevered members, they will definitely sag over time and look like crap.

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Yes.

The other option is he really really wants an L-shape, would be to move the columns to the front of the counter, run parallel stringers between them, and then the joists can cantilever in both directions are are supported closer to middle in two points.

Although if you're going to move the columns to the front of the counter, might as well just add them to the ones at the back.