Attic Retrofits Using Nail-Base Insulated Panels

This project developed and demonstrated a roof/attic energy retrofit solution using nail-base insulated panels for existing homes where traditional attic insulation approaches are not effective or feasible. Nail-base insulated panels (retrofit panels) consist of rigid foam insulation laminated to one face of a wood structural panel. The prefabricated panels are installed above the existing roof deck during a reroofing effort. The layer of insulation provides the added thermal performance, and the wood structural panel provides the rigid substrate for installation of the roofing membrane. For this study, vented attics were converted to unvented attics.