This above-grade wall assembly consists of a deeper stud cavity created using either deep studs or engineered wood I-joists , or double stud framing spaced apart,and an optional additional 2x4 service wall constructed on the interior to allow for running of electrical, plumbing, and HVAC services without penetrating the interior air barrier.

High effective R-values are achieved by filling the increased cavity depth with either batt insulation or blown-in fibrous insulation. There is often no exterior insulation installed in this assembly, so cladding can be attached directly to the wall through vertical strapping and using standard rainscreen detailing. In cold climates, the additional depth of insulation installed on the interior side of the exterior sheathing can slightly decrease the sheathing temperature and consequently increase the risk of condensation. As a result, continuity of the air barrier and installation of an interior vapour barrier are critical to the performance of this assembly, as is the quality of the insulation installation to reduce airflow within the assembly (i.e., convective looping).