i'm about to embark on a project involving building a superinsulated house with double 2x4 wall construction. The walls will be 9" thick and will be blown with dense pack cellulose. i envision the vb going on the warm side of the inner wall. i live in a very cold climate. i have several questions:
which wall is load bearing? i planned on making the outer wall load bearing, in order to shell up the structure, and adding a second wall inside after the building is dried in. but what little info i have been able to find talks about making the inside wall load bearing. this is from the canadians. anybody know why you would make the inner wall load bearing?
where the wall has roof trusses resting on it, is fire blocking required at the top of the wall? I'm thinking not because it is full of insulation. i'll ask my inspector, but wonder what you guys think.
anyone know of a website with some construction details? how to handle the windows has me in a quandry. i'm thinking of oversizing the ro's by an inch, and making a box of 1/2 inch plywood inside them (the window would then sit inside this box). this would allow me to foam the window to the box, and then caulk the vb to the box. trouble is, nailing off the window into the edge of this plywood box may be problematic. i'm also wondering if there would be value in putting a
9" rip of plywood on the top of the outer wall, expecially on the 2nd story to prevent convection from the wall cavity into the attic.if anyone's been there done that, i'd appreciate some tips. also, please don't waste your time telling me i'm stupid for going double wall--the architect and owner came up with this...i just build em.