2 x 8 stud walls, or staggered?
Southwest Nebraska – Zone 5B – I experience all four seasons. Hot summers that can be humid some years. Cold winters.
Designing my home to build. Trying to determine which is the most cost effective method to do the walls. I am young, and intend on living in this house for a very long time.
I have done so much reading on here and other sources that I have honestly confused myself. Sad, isn’t it? I realize what works in Florida will not work in Nebraska for example. However there seems to be a lot of controversy. I have read that using anything more than a 2 x 6 stud gives diminishing returns on the extra material cost to using a staggered stud wall system for ultimate insulation.
I am currently thinking I should go with a 2×8 stud wall with 16″ o.c. – Whatever wall I choose, I want 16″ o.c. for purposes of hanging sheetrock, cabinets, shelves, tvs, etc. 24″ o.c. just leaves too big of space for me to consider, even though 2 x 8 with 16″ o.c. will be overbuild in terms of load, I wouldn’t change it to 24″.
My idea from exterior to interior: Siding or stucco > Firring strips > 2″ Poly Rigid Foam >House wrap> OSB/Plywood > 2 x 8 stud bay with blown in cellulose > no vapor barrier > drywall. My logic is any moisture that gets trapped in the wall would dry into the interior.
How does my method sound? In what ways could I improve this?
I am aware spray foam offers better insulation, but I believe it may be too costly. I would have to hire it done, and contractors are not cheap. I would be willing to use the DIY kits if I knew of something affordable and reputable.
A few options I can think of are to use more rigid foam inside the stud bays, or to use very little spray foam on the inside stud bays to serve as an air seal, then cellulose after that?
Is my method flawed? Have I combined too many methods into one big mess?