WAC 51-11C-40225. Section C402.2.5 — Below-grade walls

C402.2.5 Below-grade walls. The R -value of the insulating material installed in, or continuously on, the below-grade walls shall be in accordance with Table C402.1.3. The U -factor or R -value required shall extend to the level of the lowest floor of the conditioned space enclosed by the below-grade wall.