Grundels Window System

Grundels InsulatingGlass is the easy retrofit concept that insulates existing windows without changing to new windows, improving the whole building envelope. By adding an extra glass pane, InsulatingGlass, to the existing window, single-glass windows become double-glass windows or double becomes triple. By adding Grundels InsulatingGlass to existing window, the same insulating properties as a new window will be acheived. 

In warmer climates, such as Southeast Asia the windows is the main source to high cooling load, as much as 60% of the cooling load comes from the windows and the heat that they transmitt to the temperature controlled indoor space. In colder climates like in the Nordic countries, heating is the main type of controlling temperature throughout the year. The heat loss, or the heat transmitted to the outside through the windows stands for about 35%.

A lot of energy can be saved by upgrading the windows. Grundels InsulatingGlass make window insulation easy and as energy efficient as if a new window is installed - to between 50 -70% lower cost compared to changing to new windows. The insulating value (U-Value) for a single-glass window is about 6.0, after applying a Grundels InsulatingGlass that value drops to about 1.5. For a double-glass the value is about 3.0 and after turning it into a triple-glass window with Grundels InsulatingGlass, the insulation value is reduced to about 1.3. 

The InsulatingGlass is not only insualting for energy saving purpose, the insulation will also cut the noise from outside with at least 5dB(A), a percieved drop from outside noise level by more than 50%.
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Grundels InsulatingGlass utilize the existing window as a whole, frames and glass will be reused and remain the core of the window. Normally the existing window frame as well as glass is still of good quality and there is no need to change the window because of worn out materials. The only reason for a change is to achive better insulating properties. Grundels InsulatingGlass is the sustainable option to changing windows, all exisitng materials will be reused, there is close to no scrap. Moreover, the changes in aesthetics will be minimal - from the outside there will be no changes to the look of the windows and from the inside the changes will be hardly noticable.