Insulated Entry Doors R Value

Look for a door with a good insulation value say a u value of at least 0 2 that is r 5 metric.

Insulated entry doors r value.

The r value of a 1 3 4 inch wood door is 3 03. 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. 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. How wood doors stack up.

Rochester patina 1 2 lite unfinished smooth left hand fiberglass prehung front door with sidelites model 873190 3a4 139. Feather river doors 63 5 in. 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. In new homes especially in cold climates in very energy efficient buildings.

Solid core wood entry doors have some insulating properties naturally inherent in wood. The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window.