In browsing various mfg of exterior doors, I don't seem to see much in the way of R or U value for the door, like the U that is on the sticker for a new window.
The R-value of a 1 3/4-inch wood door is 3.03. R-values climb as thickness of the material increases. A 2 1/4-inch solid-core wooden door, for example, has an R-value of 3.70.
r value for solid wood doors This is a reprint of a recent article on some studies done to show that the straight R-value of solid wood is misleading. Even though it seems worse than other materials, because wood has a lot of mass it actually can store energy, not just prevent the ingress ( or egress) of energy, which is only what R-values measure.
Doors of Distinction Limited offer a wide range of engineered Softwood, Hardwood, Bi-fold, custom, white primed, flush and contemporary Interior doors including pairs and combinations from the leading suppliers in …
U Values for Doors. From October 2010 all new doors will have to adhere to a door u value rating of 1.8W/m2K or less. Each and every door that Just Doors UK supplies and delivers is U value compliant.
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. Glass or "patio" doors, especially sliding glass doors, lose much more heat than other types of doors because glass is a very poor insulator."
Special lites can provide a U-value of 0.2 (R-5) or more, which is higher than the insulation provided by standard solid wood doors, but the opposite is more common. Lites often reduce the insulation of …
Exterior door assemblies shall conform to the performance requirements of standard SFM 12-7A-1 or shall be of approved noncombustible construction, or solid core wood having stiles and rails not less than 1-3/8 inches with interior field panel thickness no less than 1-1/4” thick, or shall have a fire resistance rating of not less than 20 ...
Those lites can provide an insulating value of R-5 or even more—significantly higher than the solid door. Steve’s beautiful doors have one other drawback: they cost an arm-and-a-leg, starting at about $5,000."::::::::
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