Windows installed over 2 inch rigid foam insulation
After sifting through many documents, videos and different opinions, I am leaning toward installing our new windows on top of 2″ polyiso. I would install 1″ x 4″ polyiso and then a 1″ x 4″ board around the window opening to provide a thermal break. The window flange would be attached to the 1″ x 4″ board. The fill in everything else with 2″ polyiso to level the plane. I was considering using Henry Blueskin VP100 on top of the polyiso foam and cut and wrap it on the sides of the window opening to seal everything up. Flash the bottom sill over the Blueskin so water drains away. Any flaws in my plan??? Almost forgot, zone 5, rain screen on top of polyiso, siding on top of rain screen. Thanks for anyone’s assistance.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part