Enerfoil is a rigid polyisocyanurate sheathing with a foil facer laminated on the top and bottom side. Enerfoil is a sheathing that: Provides high thermal resistance R6.2 per inch for improved energy efficient performance in walls. Helps decrease the cost of construction. Is user friendly. Laminated facers on both sides of the sheathing provide moderate abuse-resistance on the jobsite. Enerfoil is lightweight and easy to cut, thus reducing labor costs on site. Stud indicators improve accuracy of installation. Provides versatility. Foil facings provide the long-term moisture resistance necessary for cavity wall applications. Enerfoil's facing are also compatible with solvent-based materials, which can attack and compromise the other thermoplastic insulations. Enerfoil has a uniform thickness for consistently maintaining air space requirements in cavity wall applications.