Rigid insulation boards—such as Polyisocyanurate (ISO) and Extruded Polystyrene (XPS)—offer superior compressive strength and moisture resistance. ISO boards are widely used for roof and wall assemblies, providing high R-value per inch and excellent thermal performance. XPS boards are perfect for below-grade walls, slabs, and foundations where moisture protection is critical. Both systems improve air-tightness and minimize thermal bridging, contributing to long-term energy savings.