Window and doors
Windows with a poor energy design waste huge amounts of energy, even if they have efficient glass. This is due to the fact that the window frames are not optimised as well as the glazing and that the sealing between the frame and the wall is insufficient.
A new and energy friendly window (on the right) next to a
traditional window. The frame of window to the right is
constructed in glass fiber and composite.
Therefore, a window replacement is often a very significant part of an energy renovation, but it is important to ensure that the new windows are installed properly.
Therefore, it is important to select windows and doors with great care:
- The glass must consist of two or preferably three layers of energy glass
- The frames must be designed to limit the loss of energy in the joints between the glass and the frame
- The joints between the frame and the walls must be sealed with suitable materials
- The bigger the frame area, the higher the energy loss. This means that a few big windows are a better solution than many small ones and bars should be used with great care
- Today, there are windows on the market with a total U-value of only 0.70 – 0.85 W/m2*K. These windows are much more energy efficient than traditional windows
- Doors that are not of glass should include insulation in their core and thermal bridges should be avoided to the extent it is possible
