Windows in new buildings: triple glazing with a green tint?

What was to be expected. The glass is state-of-the-art and the best thermal insulation glass, coated twice on the inner pane and on the outer pane. This way, both cold is kept inside the house and heat from the sun is kept outside. The window manufacturer of course also says that we ordered the U-value like this and therefore the windows are like this... In the end, we would be stuck with the costs if we absolutely want different glass. My husband already thinks so, because he says that glass and light are quality of life that you have forever, and I am not so sure anymore. Everything has its pros and cons. Well... we will wait now to see how it looks when everything is plastered and whitewashed. But the difference compared to double glazing is already striking. My husband took out a basement window yesterday and held it directly next to the triple glazing... What kind of "G-value" and light transmittance do you have? For us, the Ug value = 0.5 and the G-value 35%, light transmittance 55%

But that is not due to triple or double glazing. We also have triple glazing and the panes are absolutely transparent.

Is this greenish tint from outside to inside or from inside to outside or both? I have the feeling in our house that it is harder to look inside when the room is dark, which is rather positive, but I haven't noticed any greenish tint. You don't seem to be the only case, if you search for greenish tint and window on Google. It's due to the iron oxide in the glass. I found a table from 2009, which suggests that generally the lower the energy gain and the better the U-value, the lower the light transmission. Of course, much may have changed in the 6 years since then.

The green tint is especially noticeable when looking from the inside out. However, the "green" really only comes into effect when the sun is shining and you hold something white against the windows. Under cloudy conditions, it is simply a bit darker, like slightly tinted. In our current apartment, we have 20-year-old windows with triple glazing, and they are uncoated and crystal clear...

Honestly, I can't imagine that you have triple glazing and that it is not significantly darker than old double glazing. At least, everywhere I have heard and read so far that a metal coating/metal vapour deposition is standard with triple glazing nowadays. And that is exactly what makes it darker. Do you perhaps have the datasheet at hand and can write down your values for me? Ug value G value Light transmittance value

Perhaps a brief note to everyone who is still deciding on windows. Don’t just be guided by the thermal insulation value but also look at the complete data sheets of the offered windows.

[*]Ug value (thermal transmittance): This describes the heat loss from inside to outside. A Ug value of 0.7 W/m²K means that per square meter of glazing and per degree of temperature difference (inside to outside) 0.7 W are “lost”. It is a loss-describing quantity, meaning the smaller the value, the better the thermal insulation.


[*]g-value (total energy transmittance): This describes the unique ability of the glass material to allow energy gains (from outside to inside).


[*]the light transmission (TL) describes the portion of incoming visible light that is transmitted through the glazing. The eye can perceive wavelengths between 380 and 780 nm.


[*]the selectivity describes the ratio of light transmission to total energy transmittance.


[*]the color/the neutrality of a glazing. This characteristic is certainly difficult to describe. The color rendering index Ra characterizes the change in color of an object as a result of the light transmitted through the coated glass. Ra = 100 is the theoretical optimum. A value > 80 is considered good color rendering. For Ra > 90, it is considered a very good value.

Our windows have the following values:

3-pane glazing

Ug: 0.5
g-value DIN EN 410: 50%
Light transmittance (D65) tv: 70%
Light reflection outside (D65) rv: 17%
Color rendering index Ra: 97%
b-factor (Shading coefficient): 0.63

It is clear that double glazing allows more light to pass through. I do not want to deny that either. Friends of ours have windows with the coating you mentioned, and there is a noticeable difference compared to our panes. I noticed that immediately when I entered their house. They were not greenish but rather darkening like sunglasses, although only very slightly. With us, the colors come through much more naturally.