What wall set-up would you go with?
New 1 storey home build, North East of Toronto,ON, Zone 6.
Currently the plan was 4″ exterior EPS foil covered with 2 x 6 stud wall filled with Roxul R22 or maybe 24.
Then I saw used paper faced Polyiso in 3″ thickness from roof replacements, so I’m looking into this and trying to see if I can get enough to do 2 layers on the exterior sheathing .
So questions is what wall do you think would be a better setup?
4″EPS + 2 x 6 with R22 Roxul = R40 +/- added expensive of new EPS and 2 x 6 studs
6″ Polyiso + 2 X 4 with R14 Roxul = R40+/- seems the best choice with most insulation on outside and cheaper studs.
6″ Polyiso + 2 x 6 with R22 Roxul = R50+/- Great R-value but is it overkill for my zone?.
Would like to be Net-Zero but at least a pretty good house. ( will be trying for good tightness also)
I know Polyiso loses some R in the cold,
Lastly Is the 6″ exterior polyiso going to be a pain to attach ? I was told after 4″ its a pain, Not sure why??
I looked at using FastenMaster Timberlok 10″ screws to attach furring strips to wall.
I think I have read all the articles which leans me towards the second choice but any input would help.
luckily I’m still in planning stage.
Thanks for any advice!!
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