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The High Quality glass in
VELUX Skylights and Roof Windows

Thermal Performance

  • U-Factor: The total heat flow through the total unit from room air to outside air. Lower values indicate greater insulating capability.
  • R-Value: The resistance a material has to heat flow. Higher numbers indicate greater insulating capability.
  • Solar Heat Gain Coefficient: A measure of heat gain through the total unit from solar radiation. The lower the coefficient, the lower the solar heat gain.
  • Light transmittance: The transmittance of the visible light spectrum of the total unit.
  • UV Blockage: The reduction of ultraviolet ray transmission. These values are approximate as supplied by glazing manufacturer.

0075 LOW-E

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  • Offers maximum insulation value with two panes of tempered safety glass and double Low-E coating
  • Reduced UV-ray transmission to help protect against fading of furnishings
  • Argon gas injected between the panes further reduces heat gain in summer or heat loss in winter

 

U-Factor

R-Value

Solar Heat Gain Coefficient

Light Trans-
mittance

UV  Blockage

VS

0.42

2.38

0.28

0.43

87 %

VSC

0.38

2.63

0.26

0.39

87 %

FS

0.37

2.70

0.31

0.52

87 %

0075 ComfortPlus, LOW-E, Laminated

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  • Protects against heat gain and offers maximum safety and security
  • Tempered clear exterior pane dual sealed with interior laminated pane against UV-raysto help protect against fading of furnishings
  • Double Layer of Low-E coating for comfort in any climate
  • Argon gas injected between the panes further reduces heat gain in summer or heat loss in winter

 

U-Factor

R-Value

Solar Heat Gain Coefficient

Light Trans-
mittance

UV  Blockage

VS

0.46

2.17

0.28

0.43

99.9 %

VSC

0.42

2.38

0.26

0.39

99.9 %

FSF

0.40

2.50

0.28

0.44

99.9 %

FS

0.41

2.44

0.31

0.50

99.9 %

Velux Glazing