WAC 51-11C-61013. Section A101.3—Air films

A101.3 Air films. Default R-values used for air films shall be as follows: R-Value Condition 0.17 All exterior surfaces 0.61 Interior horizontal surfaces, heat flow up 0.92 Interior horizontal surfaces, heat flow down 0.68 Interior vertical surfaces R-Value Condition 0.17 All exterior surfaces 0.61 Interior horizontal surfaces, heat flow up 0.92 Interior horizontal surfaces, heat flow down 0.68 Interior vertical surfaces