Exterior Wood Door R Value
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.
Exterior wood door r value. The r value of a 1 3 4 inch wood door is 3 03. Discover the difference of an exterior door from simpson. 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.
Rustica s french style sliding barn doors entry doors and rustica s replacement windows have the most efficient r value on the market listed at 3 94 for interior doors and replacement windows and 5 31 for a 2 1 4 exterior door. Look for a door with a good insulation value say a u value of at least 0 2 that is r 5 metric. Whether used as a front door or on the patio your simpson. In new homes especially in cold climates in very energy efficient buildings.
The r value which is a measure of thermal resistance. A 2 1 4 inch solid core wooden door for example has an r value of 3 70. 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. Below is a list of our garage doors and the r value of each one.
Welcome even more beauty and quality to your home with our comprehensive collection of exterior wood doors. As the first and last impression made on visitors to your home your front door is a symbol of your creativity and style. 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. 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.
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 higher the r value of the energy efficient entry door the better the insulation. 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.