Insulated Entry Doors R Value

The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window.

Insulated entry doors r value.

Improved education and awareness of the cost of heating and cooling that escapes from poorly insulated components and glass panes have led to window and door manufacturers developing energy efficient windows and doors typically labeled r5 u 2 meaning the glass is the most energy efficient possible at a 5 rating and the window or door with all. What is the best r value for windows and doors. In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation. How wood doors stack up.

In new homes especially in cold climates in very energy efficient buildings. Rochester patina 1 2 lite unfinished smooth left hand fiberglass prehung front door with sidelites model 873190 3a4 139. Look for a door with a good insulation value say a u value of at least 0 2 that is r 5 metric. For example a 1 1 2 inch 3 81 cm thick door without a window offers more than five times the insulating value of a solid wood door of the same size.

Solid core wood entry doors have some insulating properties naturally inherent in wood. Based on astm c518 calculation method the door has an r value of up to 11 but using astm c1363 tested operable the same door only have an r value of up to 3 5.