Insulated Metal Door R Value

Solar heat gain coefficient shgc a measure of how well a glazed door assembly absorbs or reflects heat from the sun.

Insulated metal door r value.

Metal w polyurethane core w storm. Overhead door corporation uses a calculated door section r value for our insulated doors. U value as you likely know can be converted to r value by dividing the u value into 1. Storm door frames are usually made of aluminum steel fiberglass or wood painted or not.

U value is a measure of the flow of heat through an insulating or building material. The insulation of the best doors is in the range of u 0 10 0 20 metric. 0 56 to 1 13 w m2k which is high compared to other doors but low compared to well insulated walls and attics with many inches of foam or mineral wool or other insulation material in their assemblies. A 2 1 4 inch solid core wooden door for example has an r value of 3 70.

Glazed doors in hot or temperate climates should have a low shgc. Other features may include screens with self. Factor the more effective the insulation of the material. The lower the u value the better the insulation.

For comparison with other materials a 2 inch thick metal door with a core composed of urethane foam insulation has an r. The lower the u value the better the insulating ability. U factor r value u factor r value 707 polystyrene 0 16 6 4 0 37 2 7. 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.

All doors are tested in accordance with astm c1363 and sdi 113. In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation. 1 u value r value. We have several door styles to meet your insulated door needs for both residential and commercial applications.

Acca manual j table 4a lists many types of doors assigning each a u value. High quality storm doors use low emissivity low e glass or glazing. B18 series steel stiffeners u factor 0 50 r value 2 01. The first level of insulated door core is the polystyrene which is a slab of foam that is placed in the core of the door.

Similar to most other building products manufacturers the steel door institute has encouraged the practice of citing a calculated value. Hollow metal doors with this core type are most often used at exterior openings and can be fire rated up to 3 hours. Wooden storm doors require more maintenance than the other types. 0 17 u value r 5 9 metal w polyurethane core no storm.

The lower the coefficient the better the glazed door is at blocking the sun s heat.