Glass Types & Options

Glass sealed unit consists of two layers of 4mm glass, which is 33% thicker than industry’s standard required for most residential glazing.One of the glass surfaces is coated with LowE coating which reflects heat and cold.

Glass layers are separated by the “warm edge” spacer. This spacer is a foam-like material which does not transfer temperature from glass to glass and helps reduce condensation around the edges of the window.
The space between the two panes of glass is filled with 90% Argon Gas, which helps lower thermal conductivity.

Glass 1 coating Low-E 180 Low-E 272 Low-E 366
Glass 2 coating Clear Clear Clear
Gas Filled Argon Argon Argon
U-factor metric 1.50 1.42 1.37
U-factor Imperial 0.26 0.25 0.24
R-Value 3.79 4.00 4.14
Solar Heat Gain 0.68 0.49 0.38


  • This is is the most cost efficient and practical system for most houses that are located in climate zones 1 and 2.
  • Home owners who maintain normal levels of humidity inside their house, are using ventilation fans in bathrooms and kitchens, have few indoor plants.


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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