Closed cell foam consists of tightly packed cells that prevent air and moisture from entering, making it more rigid and stable than open cell foam.
R19 insulation is 6.25 inches thick. This type of insulation is typically made from fiberglass and is designed to provide substantial thermal resistance, with an R-value of 19. It is commonly used in residential and commercial buildings to enhance energy efficiency and comfort.
Insulation should face the living space, with the vapor barrier (the paper or foil backing) towards the interior to help control moisture.