What type of wall is constructed of two wythes separated by a space for drainage or insulation?

A wall constructed of two wythes separated by a space for drainage or insulation is referred to as a cavity or hollow wall. This design serves multiple important purposes in building construction. The space between the wythes allows for drainage of any moisture that might accumulate, which helps prevent mold growth and structural damage. Additionally, the cavity can be insulated to enhance the thermal performance of the wall, contributing to energy efficiency in a building.

Cavity walls are particularly advantageous in climates where moisture can be an issue, as they help manage water infiltration effectively. They also can provide improved sound insulation between spaces, making them a popular choice in multi-family and commercial buildings. The method of separating the two wythes ensures that the load-bearing structure remains intact while allowing for a system that addresses environmental challenges effectively.