The VR Plus Shield is a multi-layer reflective insulation for use on furred-out masonry walls and frame walls in the Flash & FOIL system. This unique insulation's multiple layers separate to create three reflective air spaces, and R-values up to R-7.1 on furred-out masonry walls. Available in both a standard non-perforated version that functions as a vapor retarder and Hi-Perm perforated version that allows vapor transmission. The Hi-Perm or perforated version is recommended for applications that do not require a vapor retarder.