I am creating a little Pretty Good house in seaside zone 6 and would appreciate input on my assembly. I’m a carpenter and would be building your house myself with my partner, so I can put in the time to do the details right. Besides energy performance, my priorities are: healthy structure materials, a durable & long lasting wall, and simplicity.
from interior to exterior:
— blueboard with skim plaster
— 2 × 6 studs with 5.5″ Timber Hp batts
— diagonal board sheathing in your area crushed
— Henry blue skin or similar high perm self-adhered WRB/air barrier
— 3″ Wood Hp exterior insulation board
— vertical strapping/rips for a vented rainscreen with extra horizontal strapping for siding nailbase
— cedar shingles
My primary concerns all associate with the added intricacy brought on by the exterior insulation. I don’t mind innie windows or handling the additional strapping for shingles, but I do worry about the wood hp board being unprotected. However, with board sheathing I need a self-adhered WRB/air barrier and I have actually found out that they don’t stick to the wood insulation board items.
My options seem to be:
1) switch to Rockwool for exterior insulation and leave it exposed behind the siding/rainscreen
2) set up a layer of 15 # felt paper over the Wood board as a secondary WRB.
3) risk it with the unguarded Lumber Board
4) switch to a double stud wall and forget the exterior insulation
What would you do? And what else should I be thinking of? Thank you !!