insulation position

The position of insulation indicates whether it is installed on the inner side or the outer side of a building's structural walls or structural framework.

Interior insulation is on the inward-facing side of the structural wall or framework. Exterior insulation is on its outward-facing side.

The position is relative to the structural perimeter, not merely to the visible finish. Interior or exterior finishes can conceal the insulation without changing which side of the structural wall it occupies.