Can this retrofit follow Lstiburek’s 4th rule for venting roofs?
– zone 6a in southeast WI
– 1978 prefabricated double-wide, raised ranch
– 2×4 framing, including roof trusses
– vented roof with continuous soffit vents and a ridge vent
I’d like to retrofit according to Martin’s “pretty good house manifesto.” I’ve demo’d a room to see what I have to work with (see photo). I can’t figure out how I’ll be able to conform to Lstiburek’s rule that there should be more insulation on top of the wall than inside it. Particularly since I’d like to add an attic vent like AccuVent.
I was considering a double-stud wall and/or exterior rigid insulation but now feel like it would be wasted given the existing roof truss limitations.