Hello

Here is wall detail

Certainteed Membrane vapour barrier (breathable if wall humidity get too high)

Roxul batt insulation (2×6 wall)

Plywood sheathing ( handles any accidental moisture better)

Typar Drain wrap (allows small air sapce behind foam)

2 layers of stagered 1.5 inch eps exterior foam board (breathable to exterior)

1 x 4  firring strips (rain screen)

Hardie board siding. (my wife loves it)

Widows are in installed as innie’s with Azek exterior jamb extensions. (tripple pane dual low e and argon)

Goal, be economical, reduce all thermal gaps and be airtight.

Thoughts???