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.
Insulated steel door u value.
The lower the u value the better the insulating ability.
All doors are tested in accordance with astm c1363 and sdi 113.
Please see the charts below for each product s specific u values.
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.
Pulse fiberglass steel doors.
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.
While this remains the industry standard we are seeing more specs.
U value is a measure of the flow of heat through an insulating or building material.
Assemblies with lower u values transmit less heat than those with higher values.
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.
B18 series steel stiffeners u factor 0 50 r value 2 01.
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.