The Window as a “Solar Panel”: Light Transmittance & Solar Factor G

With this article, we cover two very important aspects of glazings: light transmission and the solar heat gain coefficient. These parameters are extremely important for performing buildings and passive houses, however they are often overlooked by both designers and window…

The glass edge thermal bridge: the PSIg value

We continue our series of articles on thermal efficiency of windows, describing the glass edge thermal bridge. As far as thermal bridges go, this one is inevitable, and it represents the weakest point of a well designed thermal envelope. It…

Energy efficiency of windows: the Uf value

After covering thermal transmittance U and resistance R of opaque assemblies, and insulated glass, we now cover one of the most critical areas of the thermal envelope: window frames. Good windows are the cornerstone of a performing building for both…

Energy efficiency and barbaric marketing

Over the years, the construction industry has been moving in the direction of energy efficiency and environmental sustainability. However in some cases, this change has happened only from a marketing point of view: with this article, we provide you with…