Polar-Ply Radiant Barrier Sheathing Polar-Ply radiant barrier sheathing is an innovative product composed of an aluminum radiant barrier which blocks 97% of summer radiant heat, laminated with flame-resistant adhesive to roof sheathing. See details… Polar-Ply Radiant Barrier Retrofit If a radiant barrier was not included in the construction of your home, you haven't missed out. Adding Polar-Ply Radiant Barrier Retrofit to your home will increase your comfort and reduce your energy use. See details…