All doors are tested in accordance with astm c1363 and sdi 113.
Insulated steel door u value.
While this remains the industry standard we are seeing more specs.
Please see the charts below for each product s specific u values.
The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window.
The lower the u value the more effective the insulation of the material.
A number which describes in specific terms the ability of a material or assembly to transmit heat from outside to inside surfaces.
U value has an inverse relationship to r value.
U value is a measure of the flow of heat through an insulating or building material.
The steel door institute has encouraged the practice of citing a calculated value for thermal performance of the cores in the doors u and r values.
Assemblies with lower u values transmit less heat than those with higher values.
Overhead door corporation uses a calculated door section r value for our insulated doors.
The lower the u value the better the insulating ability.
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.
Pulse fiberglass steel doors.
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.