Attaching Arbor / Trellis to house Ledger
We’re in the midst of doing a house Reno of a 35 year old split-level. Location is in the Okanagan Valley, BC. Climate is fairly warm/dry summers (like northern CA or AZ), with dry, somewhat cold winters. We don’t have a huge amount of rainfall / snow.
House exterior finish is 3/4″x8″ vertical channel siding.
I’m planning on building an arbor / trellis out of 2×8 Douglas Fir to visually loosen up a 17ft high wall. It will be placed above a couple of windows and a door and will be around 20ft long. I’m looking on attaching a 2×8 ledger to the house using through bolts through the rimjoist. (siding will be removed in this area). The pieces of the arbor / trellis will be ‘sticking out’ around 40″ from the ledger board, hence there will be a considerable moment-arm trying to twist them down. I do not want to use Simpson hangers or similar to attach them to the ledger. Douglas Fir 2×3 ‘s will be attached on top to provide the sunscreen and a place for the vines to grow.
The free ends of the 2×8’s will be cross drilled to enable a 1 1/4″ pipe to be inserted through them, which will be supported by cables attached to the house framing to keep the whole thing from sagging. As such, I don’t think just scewing them from the back of the ledger into the end-grain would be a good idea.
I will be applying waterproofing membrane between the ledger and the house felt-paper, as well as around the cable attachment pieces, and adding an aluminum drip-edge above the ledger.
Does anybody have a good ideas (or a detail) re fastening the individual 40″ pieces to the ledger board? Remember, I don’t want to have any fasteners showing.