4X8 3 INSUL SHEATHING FOIL JM AP FOIL R-19 PSI 16"
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A rigid polyisocyanurate foam sheathing that provides exceptional heat, moisture and air control to protect your building's exterior walls, and when installed correctly, eliminates all major thermal bridges that cause heat loss. Continuous exterior sheathing is required per building codes in many states. One side has a reflective foil face typically installed toward the warm air surface to reflect energy back toward the dwelling.