Thank you for the input. The structure will basically be a "pergola" with a sloped roof. I've constructed two before, but never had the side-wall of the house (as you see in the picture) to deal with. My primary concern is the water coming down the wall, and if I should tie-in to that wall, or not, for the purpose of keeping off the water. Most of the water will simply hit the roof that is above the backdoor, then fall on the roof of the new covering, but some will splash against the side of the wall (on the left), and then need a place to go. Transferring that water to the new roof is the tricky part. The other option is to run a ledger board along that wall, then run the roof angle "left to right". Again, thanks for the input.