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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.

View Chart
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 Series
2100 2200 2700 2750 5600 6100 6700 9100 9700 9950 Vantage Viscount

Select a Window Shape
Polygon Radius Rectangle Rectangular

Select a Window Type
Awning Casement Fixed Hung Picture Quad Slider Single Slider Slider Triple Slider

Select a Glass

For more information, please refer to the Glass Performance chart below this section.
Blinds HS1 HS1V HS2 HS3 HS4 HS4V HS5 HS6 Triple

Select Grilles
No Grille Over Or Equal 1 Inch Grille Over Or Equal 1 Inch SDL Under 1 Inch Grille Under 1 Inch SDL

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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