GAF Cornell ThermaCal Nail Base Roof Insulation Panels

Designed for use on structural wood or steel sloped roof decks, GAF Cornell ThermaCal Nail Base Roof Insulation Panels consist of: sheathing that serves as a nail base for use with shingles, metal, slate, or tile; built-in ventilation space (a non-ventilated panel is also available); and polyiso insulation. Ideal for cathedral ceilings, post and beam, and conditioned attics.