Insulated Entry Doors R Value

In new homes especially in cold climates in very energy efficient buildings.

Insulated entry doors r value.

In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation. Rochester patina 1 2 lite unfinished smooth left hand fiberglass prehung front door with sidelites model 873190 3a4 139. The r value of a 1 3 4 inch wood door is 3 03. What is the best r value for windows and doors.

Look for a door with a good insulation value say a u value of at least 0 2 that is r 5 metric. 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. Feather river doors 63 5 in. The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window.

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. How wood doors stack up.