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3

Typically, an aluminum or galvanized "z flashing" as you called it, would be installed under the siding, over the top of the ledger and down the upper lip a little. Decking is installed on top of this flashing. (Diagram not to scale) Done this way there is no need for any of the other products you mentioned unless you have moisture or insect ...


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There is nothing in the Building Code that requires a deck be attached to the house. However, if it is, then the Code requires at least two steel straps near the ends of the deck and attached to the foundation or floor joists. If you live in a seismically active area or high wind area we know the deck will move differently than the house during an “event”.


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If I understand your question correctly, the problem is that the green highlighted double joist is going to land on the joint between your two boards making up the 22' ledger attached to the house. I see a couple of options: So long as the fasteners (ledger to wall) aren't in the way of the joist hangers, have the ledger joint right there and use a standard ...


1

I've built two decks like this. One I did pt-6x6 posts epoxy bolted into the basement concrete wall. This was pseudo free standing as the posts are attached to the house. The PSL beam that sits on the posts was not (tho it attaches to the posts). There is a 1" gap between the deck and the exterior of the house. The other one I did concrete columns ...


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If the new ledger is pressure-treated, you shouldn't have to worry too much about it rotting any time soon. Butt the deck boards up against your masonry foundation wall and run a good bead of exterior caulk along there, like this:


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