Toby @kraut34, Here's the info @tfodden provided in the [specifications](https://www.dropbox.com/s/13jar8z25q1yqky/XSC%20-%20Specs.pdf?dl=0). - SECTION 072100 - THERMAL INSULATION - Roxul Inc., “Cavityrock MD”. http://www.roxul.com/products/commercial/products/roxul+cavityrock - Thermafiber “Rain Barrier” http://www.thermafiber.com/products/commercial/rainbarrier-continuous-insulation/ - SECTION 072700 - WEATHER RESISTIVE BARRIERS - http://vaproshield.com/products/wrapshield Let us know if you have trouble sourcing it. Thanks, Ryan