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glass performance

Choosing the correct glass

All performance for C.O.G. (centre of glass) ratings are based on Vision v4.0 simulations. All C.O.G U- and R-values are based on ASHREA Winter Conditions. Framing, cladding, frame type and other items will affect the overall thermal values of a complete window.

Glass Name Heat System Description Metric Imperial SHGC Visible Light Ultraviolet Block
U-Value R-Value U-Value R-Value
Dual Dual pane, clear glass, no coatings 2.73 0.37 0.48 2.08 0.76 81% 42%
Tri Triple pane, clear glass, no coatings 1.77 0.56 0.31 3.23 0.70 75% 52%
HS1-C180 Dual pane, one Low-E coating, Argon 1.48 0.68 0.26 3.85 0.69 79% 71%
HS2-C180 Triple pane, one Low-E coating, Argon 1.04 0.96 0.18 5.56 0.61 73% 71%
HS3-C180 Triple pane, two Low-E coatings, Argon 0.76 1.32 0.13 7.69 0.56 70% 87%
HS4-C270 Dual pane, one SunStop coating, Argon 1.41 0.71 0.25 4.00 0.37 70% 86%
HS5-C270 Triple pane, one SunStop coating, Argon 1.05 0.95 0.19 5.26 0.34 64% 88%
HS6-C270 Triple pane, two SunStop coatings, Argon 0.71 1.41 0.12 8.33 0.31 55% 96%
HS1V-C180/i89 Dual pane, two Low-E coatings, Argon 1.19 0.84 0.21 4.76 0.62 77% 73%
HS4V-C270/i89 Dual pane, one Low-E & one SunStop coating, Argon 1.14 0.88 0.20 5.00 0.36 69% 86%

Notes
Values are in METRIC. All performance for C.O.G. (centre of glass) ratings are based on Vision v4.0 simulations. All C.O.G U- and R-values are based on ASHREA Winter Conditions. Framing, cladding, frame type and other items will affect the overall thermal values of a complete window.

U Value: 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. 

R-Value: the amount of heat retained by the window. The higher the number the better the glass.

Solar Heat Gain Coefficient: 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 through. 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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  • 01 | Series
  • 02 | Shape
  • 03 | Type
  • 04 | Glass
  • 05 | Grilles
  • Complete all the tabs to obtain a result.

Select a Window Shape

Select a Glass

For more information, please refer to the Glass Performance chart below this section.

Selected Options:

  1. Series:
  2. Shape:
  3. Type:
  4. Glass:
  5. Grilles:

Result

  • U-value
    Metric
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  • U-value
    Imperial
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  • Solar Heat
    Gain-Coefficient
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  • Visible Light
    Transmission
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  • Energy
    Rating
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  • Energy Star®
    2020
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  • Energy Star®
    2020 Most Efficient
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  • Meets NBC
    9.36 Code
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  • Meets BCBC
    9.36 Code Zones
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