The type of window and the installation method used depends on the problem that is being overcome and the construction characteristics of the house. The following problem areas are presented and explained to help you understand the various directions your new window installations might take.
Ultra Violet light fades materials such as wall paper and flooring and breaks down fabrics.
Ideally, a window would block the damaging UV rays that cause fading, while letting light pass through.
Ordinary clear window glass lets in about 70% of the sun's UV radiation.
New varieties of high-performance clear window glass, commonly called "low-e" glazings, provide some protection from UV radiation.
Even the best of these, however, still transmit 26% of the damaging UV rays.
NIR = Near Infrared Rays - responsible for solar heat gain