The 'CC Wall'

A fly through view of how we build our 2 layered Larsen Truss style wall. We start with conventional 2x6 framing and plywood sheathing. After the plywood is nailed we cut the window and door openings and add a plywood window buck that is the full wall thickness. We then tape all the seams in the plywood to make the assembly fully airtight. The next step is to add I-joists on every common stud, this is the uninterrupted exterior insulation layer making for a very quiet and comfortable home. We close in the I-joist layer with woodfiber board or a reinforced membrane and fill the cavities with dense packed cellulose filled to a volume that is firm and will never settle. The final layers are a Water Resistant Barrier and 1x4 strapping to prepare for siding installation.

[kirkellis]

This doesn't seem like an "uninterrupted exterior insulation layer" considering there is now a thermal bridge running from the outermost i-joist flange, through the web and inner flange and directly to the 2x6 studs the entire height of the wall. Why not simply 2x4 outer wall studs attached at base plate level and top plate level and an open gap between it and the inner stud wall sheathing, using a small triangular truss top and bottom ? The i-joist can't carry any load in a vertical attachment and is just acting as a spacer to carry the weight of the siding back to the 2x6 inner wall anyway, right ? Can't an outer 2x4 stud wall carry that small siding load ?