Double walls with different heights?
My latest sketch has double 2×4 walls with the outer wall supporting itself and the roof while the inner walls is supporting the ceiling (framed with 9 1/2″ I joist 24″OC) , an attic floor (the air barrier) and insulation. This allows deep insulation with flat bottom trusses and gives an “attic” floor to “set” the trusses. The ceiling service cavity below the air barrier allows “can lights” without the usual leakage issues. Hopeully the flat bottom trusses will be enough cheaper than deep energy heel trusses to offset the cost of the I joist. Has anyone done something similar?