Best DIY exterior wall cavity insulation for 2×6 wall with exterior rigid foam
I’ve been searching long and hard for the best way to insulate my future home’s exterior walls with the available sub contractors and cost effective materials available in my area. I definitely want to include a thermal break between the studs and sheathing in some form. The path we’ve gone down to date is to have exterior insulation on the outside of our sheathing of a 2×6 exterior wall.
To give context, I’m in Yakima Washington. I’ve been told having OSB or plywood sheathing is most likely a requirement due to seismic considerations. It’s also worth noting there are not any dense pack cellulose contractors in my area willing to do the job, which was the direction I wanted to go… that leaves my contractor suggesting a dense pack fiberglass as option. It’s my understanding that dense pack options mean I cannot do it myself without a commercial blower which I don’t believe I can rent in our area. I’d like to save on labor costs for the wall cavity insulation if I can to keep the budget where it needs to be.
All things above considered, this limits dense pack options unless the materials costs are greater than a subcontractors labor plus their charge for materials. The options I’m debating between are listed below, these materials are in sequential order going from exterior to interior:
1) Stucco exterior finish, XPS rigid foam at 2″ taped w/ taped seams (DIY), Tyvek Drainwrap w/ taped seams (DIY), plywood sheathing (DIY), 2×6 OVE framing, dense packed fiberglass cavity, finished gypsum board (DIY).
2) Stucco exterior finish, InSoFast EPS panels at 2.5″ (DIY), Tyvek HomeWrap w/ taped seams (DIY), plywood sheathing (DIY), 2×6 OVE framing, dense packed fiberglass, finished gypsum board (DIY).
– Thoughts on using Roxul ComfortBatt or high density fiberglass in either of these walls since I can to the labor myself and save on the subcontractor labor costs?
– Thoughts on the Stucco finish with the exterior rigid foam? Looking to do something different than fiber cement lap siding. Open to other ideas, especially DIY friendly ideas or something more cost effective 🙂
Feedback is much appreciated and advice is much appreciated!
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