If you’re shopping for a new garage door you have no doubt run into the term R Value. This refers to a garage doors insulation rating. But what is R Value exactly?

R Value is the capacity of an insulating material to resist heat flow. The higher the R Value, the greater the insulating power. That means, the better the garage door is at stopping the warm air from traveling through the garage door.

Different materials affect the R Value of your garage door. There are two common forms of insulation used in garage doors. Polystyrene, which is a Styrofoam, and Polyurethane, which is a sprayed foam. Polystyrene is inserted into a garage door panel after the garage door has been manufactured or in some cases, installed. This ‘aftermarket’ style of insulation will leave gaps for air to get in, bringing down the insulation ability of those garage doors. Polyurethane is sprayed into the door during the manufacturing process. This is a much stronger form of insulation as it fills all of the gaps and bonds to the steel of the garage door. Naturally, Polyurethane garage doors are going to have a higher R Value rating than polystyrene garage doors.

If you’re looking for a new insulated garage door, you have to take into consideration the amount of R Value you will need. If you are converting your garage into another room, you are going to want a fairly high R Value (12-18) out of your garage door. This will help prevent the heat from entering your new room and driving up the cost to keep it cool. If you’re looking to cool down your garage on a hot sunny day, you may want a middle to high R Value (6-12).

We recommend speaking to one of our door specialists about your garage door needs to ensure your purchase meets all of your expectations!