2 inches of polyiso and 8 inches of dense-packed cellulose in Climate Zone 4
Location is Philadelphia, PA. Brightbuilt double stud wall is 2 inches of polyiso and 8 inches of dense pack cellulose. Isn’t that too low a ratio for the external foam? Depending on how you derate the polyiso, you only have 25% or so of insulation outside the sheathing.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part