What are the negative aspects of using Tyvek on a double wall system instead of plywood sheathing?
I am detailing the exterior walls to be a double wall, its sequence as follows from interior to exterior: gypsum board on structural 2×6 with rockwool insulation, 1/2″ plywood sheathing, continuous 10 mil vapor/air barrier, 11 7/8″ TJI joist with dese packed cellulose insulation, 1/2″ plywood sheathing, WRB membrane, 1×3 rainscreen furring strip and hardi-plank siding. I have read Thorsten Chlupp’s wall detail that uses Tyvek thus eliminating the use of the 1/2″ plywood and WRB membrane. I would like to go down this path because of the economy of materials but am not sure about using only Tyvek at that location. Any guidance would help.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part