Reflective Glazing

extremely effective in maintaining comfortable interior temperatures at low cooling cost.

2. When choosing glass, use the "shading coefficient" figures f rom manufacturers' catalogs to evaluate the relative abilities of various types of glass to reduce solar heat gain. A shading coefficient of 0.35, for example, means that the glass will admit only 3596 as much solar heat as double-strength clear glass and half as much heat as glass that has a shading coefficient of 0.70. The shading coefficient of reflective glazing depends mostly on the density of its metallic coating.

3. The detailer should keep in mind some potential problems that are often associated with reflective glazing: It can reflect the sun into the eyes of pedestrians and motorists. It can cause solar overheating problems in adjacent buildings and outdoor spaces by reflecting sunlight onto surfaces that would not otherwise receive it. And, while reflective glass gives complete privacy to the interior of the building during the day, at night it appears from the outside as dark but transparent glass, and the interior of the building is fully visible to passersby if the lights are on. ■

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