As you can see from the diagram and the photo flashing must be done in layers. The best way to think about it to visualize what a drop of water will do as it hits the deck and moves towards the house. First the rain hits the siding, then it gets to the house wrap, then it hits...
Framing just got completed. We are using a 30 year membrane, but heard I need to have 4 plys. I like the Bison deck products that sits on top of round plastic so the wood does not sit right on top of the membrane, but the deck is already built and it is flush with the sliding ...