Gahanna Roofing: Article About High Efficiency Windows
The pursuit of energy efficiency through various methods not only makes economic sense for homeowners, it also represents a positive step in the goal of reducing the growth of greenhouse gases in the atmosphere. One potential for accomplishing these two objectives involves replacing old, worn out windows with new ones featuring low emissivity glass. The common industry term for windows with this type of glass is Low E. A professional Gahanna roofing company can explain the benefits of using Low E windows for monetary and environmental purposes.
Windows with Low E coatings on the glass serve two purposes. They reduce the amount of incoming heat from the sun in the infrared and ultraviolet radiation spectrum by reflecting it away from the glass. At the same time, they impede the escape of heated inside air in the same manner. Low E coatings work in wavelengths that are invisible to the eye. No reduction of light that comes through the window in the visible spectrum takes place.
The coatings used to manufacture glass for Low E windows consist of two different types. There are passive Low E coatings and solar Low E coatings. Applied to hot glass during the manufacturing process, passive Low E coatings fuse with the hot glass surface to form an extremely tough bond. Solar Low E coatings use a different method.
A roofing contractor from Ohio roofing Solutions of Gahanna OH would be happy to answer any question you have about commercial roofing or windows.
This type of coating, applied to room temperature glass in a vacuum chamber, needs a layer of sealant for the best results.
Passive Low E coated windows perform best in colder climates. They permit some of the sun's heat to pass through during the cold months and supply some heat, but they trap the heat from heating systems. Solar coatings are intended for warmer climates where cooling from air conditioning assumes more importance than heating.
Low E glass windows receive ratings based on several different performance features. U Value rates the windows on how much heat loss they permit. The lower the U Value, the better the windows prevent the escape of heat. Visible Light Transmittance (VLT) measures the amount of light that passes through the glass. For this measurement, higher numbers represent the ideal.
The other important measurements of Low E glass, the Solar Heat Gain Coefficient (SHGC) and the Light to Solar Gain (LSG) ratio, rate the solar radiation entering a window and the relationship between that radiation compared to its effect on the amount of visible light transmitted. These numbers may sound complicated, but a professional roofing company with experience with Low E glass will simplify the process of selecting the ideal ratings for Ohio climates.