Would someone direct me to the ICC section that discusses when an air (vapor) barrier is required.
Helping to build a home for Habitat for Humanity. OC foam in the walls; blown in celluose in the attic. Local BI told us that a plastic air barrier is needed over the foamed walls prior to drywall; and on the ceiling prior to drywall.
Have built last 4 houses the same way and no plastic was needed. Thank you.
