Exterior Wood Door R Value

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Exterior wood door r value.

As the first and last impression made on visitors to your home your front door is a symbol of your creativity and style. For example the typical r value of a six panel wood door is a two whereas a fiberglass door system may have an r value of 10 or 12. U value has an inverse relationship to r value. A 2 1 4 inch solid core wooden door for example has an r value of 3 70.

R values climb as thickness of the material increases. The r value of a 1 3 4 inch wood door is 3 03. 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. In new homes especially in cold climates in very energy efficient buildings.

The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window. 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. The r value which is a measure of thermal resistance. For comparison with.

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. Look for a door with a good insulation value say a u value of at least 0 2 that is r 5 metric. This is a huge difference and essentially comes down to astm c518 being a theoretical maximum based on a steady state thermal test of only a portion of the door panel. 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.

Below is a list of our garage doors and the r value of each one. Whether used as a front door or on the patio your simpson. 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.