In a region that’s half-cold half-warm, does it matter which side of insulation you put a vapor barrier?
The vapor barrier goes on the warm side of the insulation, with warm side meaning the exterior if you’re in a hot climate and the interior if you’re in a cold climate. What if you’re in a climate that’s half-hot half-cold? Where the heating degree days and cooling degree days are equal, does it matter which side of insulation you put a vapor barrier?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part