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GLASS
Standard roof glass is tempered/tempered one inch overall thickness (3/16-5/8-3/16) insulated units in High-Performance Low-E glass. Side glass is tempered/tempered 7/8 inch overall (3/16-1/2-3/16), also in High-Performance Low-E glass. There are two optional upgrades to the High-Performance Low-E glass.
DESCRIPTION
(1" Overall) |
U-VALUE* |
SOLAR HEAT GAIN COEFFICIENT** |
SHADING COEFFICIENT*** |
VISIBLE LIGHT |
REFLECTANCE (Exterior) |
| Typical Low-E Glass (on most homes) |
.33 |
.66 |
.76 |
73% |
17% |
| SB 60
High-performance Low-E Glass (our standard) |
.29 |
.38 |
.44 |
70% |
11% |
Upgrade 1: SB 70XL
High-performance Low-E: Better Shading Coefficient |
.28 |
.27 |
.32 |
64% |
12% |
Upgrade 2:
Azuria over SB 60
Commercial Shading Coefficient |
.24 |
.30 |
.35 |
54% |
9% |
* U-value measures the insulating properties of glass. The lower the better.
**Shading coefficient and Solar Heat Gain Coefficient measure the amount of solar energy admitted through the glass. The lower the U-value, the lower the air-conditioning costs.
***Upgraded (lower) shading coefficients may be desirable in high-sun locations to reduce heat gain. Note the reduction in Visible Llight Ratio that accompanies higher shading coefficients. (For comparison, note that clear insulated glass has a Visible Light Ratio of 80%).
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