The stud space can be insulated using a variety of different insulation types, including batts (i.e., mineral wool or fibreglass) and blown-in fibrous insulation (i.e., fibreglass or mineral wool).

Various types of exterior insulation can potentially be used in split-insulation wall assemblies, including permeable insulations such as semi-rigid or rigid mineral wool, or semi-rigid fibreglass, and relatively impermeable foam plastic insulations.

While each of these insulation materials can provide adequate thermal resistance, the permeability of the materials is of particular importance with respect to the drying capacity of the wall assembly. In most wall assemblies in cold climates, vapour permeable exterior insulation typically provides a lower risk than impermeable exterior insulation.