Originally Posted by Bonzai
Really need to see a drawing to understand properly what you are proposing. A pergola would normally involve a beam supported on top of the posts and then the joists extend out and notched over this ... As opposed to lag bolting in to the side of the posts. I'm not saying it can't be done as it's non structural but if you google "pergola design" you'll see how one traditionally is built. Again a picture may confirm or otherwise what I am trying to imagine you're design is.
I think I have come to that conclusion also after doing more research.
My main concern was whether I could attatch the deck to the pergola without having the pergola posts drop down to new concrete piers.
I made another sketch showing what the pergola would look like. The posts would be notched into the 2 x 12 "side joists". (Note, the other joists are 2 x 10, but the two ends are 2 x 12)
If you look at the original drawing, the pergola would be on the two sets of leftmost 4 x 4s.