Glass Performance

 

Code

Description

U-Value

R-Value

Solar Heat Gain

Ultraviolet Blockage

Visible Light Transmittance

Clear

Dual

Dual panes of clear glass, no coatings and no Argon

0.5

2.02

0.76

42%

81%

Tri

Triple panes of clear glass, no coatings and no Argon

0.32

3.15

0.68

42%

74%

Low E

HS1

Dual panes of glass, one pane with Low E coating

0.35

2.88

0.72

56%

76%

HS1A

Dual panes of glass, one pane with Low E coating and Argon

0.3

3.33

0.73

56%

76%

HS2

Tripane glass, one pane with Low E coating

0.24

4.17

0.66

63%

69%

HS2A

Tripane glass, one pane with Low E coating and Argon

0.22

4.58

0.66

63%

69%

HS3

Tripane glass, two panes with Low E coating

0.2

5

0.56

72%

64%

HS3A

Tripane glass, two panes with Low E coating and Argon

0.17

5.97

0.56

72%

64%

SunStop

HS4

Dual panes of glass, one pane with SunStop coating

0.29

3.44

0.39

70%

62%

HS4A

Dual panes of glass, one pane with SunStop coating and Argon

0.24

4.17

0.39

70%

62%

HS5

Tripane glass, one pane with SunStop coating

0.22

4.57

0.37

75%

57%

HS5A

Tripane glass, one pane with SunStop coating and Argon

0.19

5.31

0.37

75%

57%

HS6

Tripane glass, two panes with SunStop coating

0.16

6.31

0.3

86%

43%

HS6A

Tripane glass, two panes with SunStop coating and Argon

0.12

8.2

0.29

86%

43%

All performance is C.O.G. (centre of glass) ratings based on Vision v4.0 simulations. All C.O.G U- and R-values are based on ASHREA Winter Conditions. K-Values shown are based on approximate conversion from imperial R-Values [K=1(r/4.88].

U Value: is the total heat transfer out of a window (Btu/hr-sq ft-F or W/sq m- C) the lower the number the better the glass. U value is the inverse of R value. R= 1/u
R-Value: is the amount of heat retained by the window. The higher the number the better the glass.
Solar Heat Gain Coefficient: is the amount of solar radiation which enters the house through radiation. This is expressed as a dimensionless number between 0 and 1. It represents the heat gain through 3mm clear glass.
Visible Light Transmittance: measures how much of the visible light is entering the building through the glass. 1.0 would mean all of the light was getting through and 0 would mean none of it was getting in. Our atmosphere naturally filters out 5% of the visible light. Clear glass with no coatings lets in approx. 90% of visible light.

 

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