Insulated Entry Doors R Value

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.

Insulated entry doors r value.

The r value of a 1 3 4 inch wood door is 3 03. Look for a door with a good insulation value say a u value of at least 0 2 that is r 5 metric. The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window. 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.

Solid core wood entry doors have some insulating properties naturally inherent in wood. What is the best r value for windows and doors. How wood doors stack up. Many of these doors are remarkably like real wood and may have a thick polyurethane or other foam core a feature that boosts their insulating value.

Feather river doors 63 5 in. In the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation.