Insulated Steel Door U Factor

A number which describes in specific terms the ability of a material or assembly to insulate heat.

Insulated steel door u factor. Look for a low u factor. Installed u factor a tested value of actual energy loss whether heat or cold of an installed door wall or window assembly. Energy star qualification chart pulse fiberglass steel doors. Doors cannot offer the same insulation of attics or walls.

Obviously this is in part unavoidable. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell. L18 series per astm c1363 r factor 2 81 u factor 36. Across the width of the door.

B18 series steel stiffeners u factor 0 50 r value 2 01. L18 series honeycomb u factor 0 56 r value 1 80. U factor the total or overall transmission of heat through a combination of materials assembly measured in btu s per hour per square foot of area for a difference in temperature of 1 f between the air on one side to the air on the other side. Assemblies with higher r values insulate more heat than those with lower values.

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. All doors are tested in accordance with astm c1363 and sdi 113. Factor the more effective the insulation of the material.

For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. 1 u value r value. Optimize energy efficiency with high performance openings. With energy prices continually increasing and commercial buildings consuming almost 40 of energy usage in north america ceco door remains committed to providing maximum thermal resistant solutions.

Even the best entry doors have relatively modest insulation levels. The lower the number the lower the energy loss and therefore the better the thermal performance. The trio e door is steel stiffened for strength but has achieved an operable u factor of 0 36 which is better than most other steel stiffened doors currently available on the market today. These doors are often specified at high abuse areas or can be used at openings where sound transmission ratings are a concern.

U factor will vary between 0 66 and 1 00 depending on finish and color selection. Steel stiffened hollow metal doors have steel channels that run the full height of the door and are spaced about 6 o c. They are spot welded to the faces and the gaps between the channels is filled with insulation. The lower the u factor the better the door keeps in heat.

U value has an inverse relationship to r value.