Wall assembly help
I wanted to get some advice on two wall assemblies I am considering. I am in Iowa- climate zone 5. Cost is a factor but would like to have an efficient assembly as we are going to live in this house for a long time.
Option 1 from outside in
LP Smart side
1/2” furring strips/rain screen
1 1/2” XPs rigid foam
TyVek commercial D drain wrap
2×6 standard framing with BIBS and my insulation contractors basic air sealing package
1/2 Sheetrock latex paint
Homeslicker drain mat
ZIP R sheathing 1.5” r vale 6.6
2×6 wall BIBs and air sealing
1/2 sheet rock latex paint
I like that I can surface mount and flash my windows in the zip system but am afraid of getting my structural OSB to far away from the framing with the thicker ZIP panels. I would much rather use jamb extensions inside than exterior window bucks. The attic will be sprayed with a butter coat (as they call it around here) of 2” of foam topped off with blown cellulose for an R50. Rims sprayed as well. Foundation will have 2” exterior foam with interior framed 2×4 walls and Roxul bats. Same 2” of foam placed below foundation slab as well.
What do you guys think of this overall and what would be the better option for my wall assembly? Are there any areas that need to be beefed up or areas I can cut back on?
Thank you! GBA is a great resource
Jeremy from Iowa