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GLASS Standard roof and side glass is tempered/tempered one inch overall thickness (3/16-5/8-3/16) insulated units in High-Performance Low-E glass. Upgraded glass with higher shading coefficients is listed below. Impact resistant glass for hurricane zones is also available.
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% |
| High-performance Low-E Glass (our standard) |
.26 |
.40 |
.46 |
71% |
11% |
| Upgrade 1 High-performance Low-E: Better Shading Coefficient |
.25 |
.27 |
.31 |
64% |
11% |
| Upgrade 2: Maximum Shading Coefficient |
.26 |
.24 |
.28 |
39% |
14% |
* 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 better to reduce air-conditioning costs.
Upgraded (lower) shading coefficients may be desirable in high-sun locations to reduce heat gain. Note reduction in visible light ratio that accompanies higher shading coefficients. (Note that clear insulated glass has a visible light ratio of 80%).
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