The GCS Roof Insulation 3mm Double Foil is a high-performance thermal barrier designed to reflect radiant heat and enhance energy efficiency in buildings. Made from 3mm polyethylene foam sandwiched between double-sided reflective aluminum foil, it offers excellent thermal insulation, moisture resistance, and sound dampening. Ideal for use under metal roofs, tiles, or ceiling panels. Each roll measures 1.2m x 40m, easy to install and environmentally safe.