Overhead door corporation uses a calculated door section r value for our insulated doors.
R value of glass 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.
R values climb as thickness of the material increases.
U value is a measure of the flow of heat through an insulating or building material.
For comparison with.
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.
The lower the u value the better the insulating ability.
We have several door styles to meet your insulated door needs for both residential and commercial applications.
The r values for specific assemblies like doors and glazing in the table below are generalizations because they can vary significantly based on special materials that the manufacturer uses.
For instance using argon gas in a double pane insulating glass unit will dramatically improve the r value.
The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window.
So the reciprocal of your glass unit s u value of 0 29 can be determined by dividing the number 1 by 0 29 which would give us 3 4482 or roughly 3 5 and that would be the r value for your glass.
The r value of a 1 3 4 inch wood door is 3 03.
Consult manufacturer literature for values.