What is rafter lock insulation?

Rafter lock insulation is a type of insulation system designed for use in attics, specifically between roof rafters. It typically consists of rigid foam board or fiberglass batts that fit snugly between the rafters, providing thermal resistance and preventing heat loss. This system helps maintain energy efficiency in buildings by reducing air leakage and improving overall insulation performance. Additionally, rafter lock insulation can contribute to soundproofing and moisture control in the attic space.