Basement Windows

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Basement Windows Single Pane 4mm Glass Double Pane 4mm Glass Triple Pane 3mm Glass
Glass 1 coating Low-E 180 Low-E 272 Low-E 180
Glass 2 coating Clear Clear Clear
Glass 3 coating Low-E 180
GAs Filled Argon Argon Argon
U-factor metric 1.52 1.49 1.12
U-factor Imperial 0.27 0.26 0.20
R-Value 3.74 3.81 5.07
Solar Heat Gain 0.44 0.32 0.36
Air Leakage 0.105 0.105 0.105
ER ratings 32 25 36


  • Cranks out open from the bottom up
  • Three layers of weather stripping prevents drafting
  • Collapsible lock and handle that doesn’t interfere with curtains & blinds
  • Tough aluminum screen frame with fiberglass mesh
  • Beautiful exterior frame profile for an eye catching curb appeal
  • Excellent choice for a triple pane glazing system


Windows, skylights and doors are not generally assigned with an R-value when they are being tested. Nevertheless, window salespeople and contractors may often refer to an R-value for measuring the window performance.

R-value serves as a measure of the resistance to flow of heat. In order to understand this

R-value system in a better way, you can sample U-factors in metric as well as imperial units that have been perfectly converted to the R-values in this following table. Since the ER values are actually derived from a mathematical formula that makes use of U-factor as well as solar heat gain, there’s no method for directly converting the ER value into an R-value.

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