The R2 SILVER product is composed of a closed-cell polyisocyanurate foam core bonded on both sides to a composite foil “tri-laminate” facer. R2 SILVER can be installed on the exterior or the interior side of the wall assembly. R2 SILVER is offered in different thicknesses, sizes and foam core densities. It is secured in place with fasteners, adhesive or a combination of the two. Installation technique depends on the wall assembly. R2 SILVER has been fi retested to NFPA 285 and passes this tough test in several wall assemblies.