Preventing air-washing in fiberglass batt insulation
I have had a number of situations where a wall insulated with fiberglass batt insulation is exposed to air spaces (a knee wall, e.g.). Since the movement of air through fiberglass greatly reduces its ability to insulate, would it make sense to apply something like a housewrap over the batt insulation to reduce the airflow (and increase the insulating value)? Or is there another way to resolve this problem? I have thought of plastic or insulating board (polyiso), but would be concerned about moisture issues (condensation).
GBA Detail Library
A collection of one thousand construction details organized by climate and house part