Looks can be deceiving. From a distance, you see wood. Up close, it's sturdy, durable, low-maintenance steel. The Classica Collection of Carriage House Doors is available in Non-Insulated, Vinyl Poly-Back Polystyrene or with Polyurethane Insulation with a Steel backing. These Three-section tall designs, instead of four, help deliver a more authentic carriage house look. Deception never looked so good.