Air barrier with polyiso foam insulation
I am building a house with steel C roof joists (flat) and polyiso 9 inch (3 3" layers) foam underneath. ( all material is reclaimed and free)
Should I use an air or moisture barrier between foam and steel joists? House is in Lexington, Va.
Posted Jan 12, 2013 10:29 AM ET
Other Questions in Energy efficiency and durability