Window and Door Installations in “Thick” Walls
In reading various posts, I have noticed some innuendos and outright comments regarding the difficulties of installing windows and doors in framed walls with out-sulation and double stud walls. Being a novice at best, I would really love to hear opinions about the trials and tribulations involved. To structure the discussion a bit, please assume two wall designs.
Design 1: Drywall, 2×6 24” OC studs filled with R-23 MW batts, taped plywood sheathing (air barrier), 3” MW, WRB, furring, siding.
Design 2: Drywall, 2×4 16” OC studs filled with R15 MW batts, 2” gap filled with MW, 2×4 16” OC studs filled with R15 MW batts, taped plywood sheathing (air barrier), WRB, furring strips, siding. Outer (structural) wall and MW-filled gap between walls extend down to foundation/sill in front of the band joist to reduce thermal bridging.
I am leaning towards “outie” windows (hence the placement of the WRB in design 1 on the exterior of the MW out-sulation).
Although I am primarily interested in comments regarding the installation of windows and doors, I am always open to opinions about relative strengths and weaknesses of the two designs. With that in mind, I would plan on insulating the band joist from inside the basement as well (in both designs). The house is to be built in CZ 6 (inland 20-30 miles from midcoast Maine).
Thanks for your input.