I am interested in using your “cut and cobble” method for insulating the walls of my addition. I live in zone 5 and plan to use 2″ of extruded polystyrene and 4 1/2″ of dense pack cellulose. Are there any negative effects in using readily available uncoated extruded polystyrene with a perm rating of 1. ? The coated extruded poly seems to have a perm rating of .1 but I cannot locate any ( Dow is no longer making it).
GBA Detail Library
A collection of one thousand construction details organized by climate and house part