Double Layer Insulation Systems

Multiple layers can be applied to achieve higher r-values. Your purlin depth determines the thickness of your bottom layer.

Double LayersR-Value
4" + 4" R-26
3" + 6" R-29
3.5" + 6" R-30
4" + 6" R-32
2 5/8" + 8" R-33
3" + 8" R-35
6" + 6" R-38
3" + 9.5" R-40
4" + 9.5" R-43