The R-value you need depends on your home and lifestyle. If you have a heated garage, then our super-efficient 2-inch thick polyurethane doors offer a whopping 18.4 R-Value. If the space is not heated, or the garage is free-standing and not attached to the home, then a 6.4 or 9.0 R-value might be more appropriate. We will help you choose the door that fits your home and budget best.