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Window/Door R-Values

The following table will give you a rough idea of your window/door R-values:

Type R-value
Windows
Single Glass 0.91
Single Glass with Storm 2.00
Double Glazed - 3/16" air space 1.61
   1/4" air space 1.69
   1/2" air space 2.04
   3/4" air space 2.38
   with suspended film 2.77
   with 2 suspended films 3.85
Low-E 3.13
   with suspended film 4.05
   with 2 suspended films 5.05
Doors
Wood Hollow Core Flush 2.17
Wood Solid Core Flush 1 3/4" 3.03
Wood Solid Core Flush 2 1/4" 3.70
Wood Panel Door 1 3/4" 1.85
Wood Storm Door 50% Glass 1.25
Metal Storm Door 1.00
Metal Insulated Door - Average 7.00
Metal Insulated Door - 2" Urethane 15.00

 
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