The Insulated Sandwich Door model is perfect for commercial applications where insulation value is important. This series offers a steel front and back giving the door added strength and insulation types of polystyrene and polyurethane with R-values from 10.29 to 26.89. Color options include White, Almond, Sandstone, Brown, Gray, and Black. Window options are also available. Door sizes range from 36 feet wide to 20 feet tall. Our most popular models are 3285 (polystyrene R-10.29), 3216 (polyurethane 2” thick R- 17.54), and 3236 (polyurethane 3” thick R-26.89).