The most common type of radiant barrier is a plastic sheet that has a reflective foil facing on one or both sides. This type of radiant barrier is usually installed in the attic, stapled to the bottom edges of attic rafters. Some types of rigid foam and fiberglass batt insulation are faced with radiant barrier material, so they can provide the benefits of insulation and a heat-reflecting barrier. Still other radiant barriers are incorporated in a plastic, bubble-wrap material that can be stapled into place just like standard plastic sheet material.