Solid Wood Garage Door R Value

The r value of a 1 3 4 inch wood door is 3 03.

Solid wood garage door r value.

This value when compared to other insulating materials is actually pretty low. It is so low that it is below many industry standards. Below is a list of our garage doors and the r value of each one. Heavy duty 1 5 8 section thickness.

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. Primed finish available on all models. 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. Flush panel wood garage doors.

External panels are pressure bonded to framework with high strength waterproof adhesive. Insulation polystyrene insulated core provides a 4 75 r value section thickness 1 3 8 on all models. Flush panel wood garage doors model 33 three layer construction with polystyrene sandwiched between interior and exterior boards. It does not offer twice as much thermal resistance or twice the energy savings.

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. An r value of 16 is not twice as good as an r value of 8. A value of r 16 offers a 5 reduction in heat flow and a 5 improvement in energy efficiency over an r value of 8. If installed correctly and not bent this type of door needs no further weatherstripping.

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. In hardwood it is 0 71. 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.

Per inch r value of softwood is 1 41. The r values of most steel and fiberglass clad entry doors range from r 5 to r 6 excluding a window. Logs of around 6 inches would then have an r value that is about 8.