CHI’s models 2283, 2284 and 4283 garage doors are double sided steel with polystyrene insulation. These CHI garage doors have an R value of up to 8.57. Different window, color and panel lengths are available. We offer free estimates for new garage doors. All of our work is backed by a solid labor warranty. For more information on garage door installation in the Atlanta area, please call us at 678-714-7393, or contact us online.