The R2 SHEATHE product is composed of a closed-cell polyisocyanurate foam core bonded on both sides to glass-backed, reinforced aluminum foil facers. R2 SHEATHE can be installed directly over steel or fi re-treated wood studs in many NFPA 285 wall assemblies. R2 SHEATHE also passes NFPA 286 testing for exposed interior use. R2 SHEATHE is offered in different thicknesses and sizes. It is secured in place with fasteners, adhesive or a combination of the two.