Flashing windows in a “vent” screen
Seems like every new project these days requires re-inventing the wheel on flashing systems. Here’s my new one. 10″ double stud construction with celluose insulation. Even though I’m in a dry climate (rocky mountain west) I want this wall to dry to both sides so airtight drywall with no vapor barrier. Plywood, (not osb) exterior sheathing. Since we’re using vertical FS siding I want a vent cavity between the sheathing and the siding, plus, I don’t like the idea of nailing FS to just sheathing so horizontal 1X4s provide both a gap and solid backing. I don’t need a proper rainscreen, but this detail will allow everything to stay dry. The devil is in the details though. flanged windows are installed on the outside of the strapping. Tyvek has to go against the sheathing, under the strapping. So how do I tie the flexible flashing over the window flanges back to the tyvek? Current proposal is to install tyvek, then a continuous bead of sealant around each window opening, then the furring strips, then install a window , continous,flex flashing, etc… (see the detail attached). The problem is that the flex flashing basically has to wrap around the 1x furring and stick to the face of the tyvek. I may be over thinking this but any thoughts would be appreciated.