To achieve optimal insulation performance, rigid foam board for exterior walls should be installed as a continuous layer over the structural sheathing. Panels should be tightly fitted and seams should be sealed using insulation tape or spray foam to prevent air leakage. Mechanical fasteners or adhesive bonding systems are typically used to secure the boards. In many building systems, rigid foam boards are combined with weather-resistive barriers and exterior cladding materials to create durable and energy-efficient wall assemblies.

