Raynor Showcase doors feature 2" thick sections, a continuous thermal break between sections, and expanded polystyrene insulation bonded between two steel skins for an outstanding 10.25 R-value. Showcase doors feature hot-dipped galvanized steel track and hinges. Showcase doors carry a "For As Long As You Own Your Home" section warranty against rust and a five-year warranty on hardware and springs to the original purchaser.