ᐅ Windows in New Construction: Triple Glazing with a Green Tint?
Created on: 14 Jun 2015 11:27
W
WildThing
Hello dear forum members,
I have a question for all home builders!
We have had our windows installed for a few days now and were quite excited. Unfortunately, we are a bit disappointed because the window panes have a noticeable green tint. We never discussed the glass with the window installer, as it never occurred to us that window glass might not be completely clear.
Apparently, we received some kind of "insulated glass" with a coating. We really don’t like the green tint; it makes everything look dull and even makes us look a bit "sick" ourselves... :-( It feels like we have the glass from a light sunglasses lens as a window, instead of “real” windows!
How is it with your windows?
Is it normal for triple glazing to have some kind of color tint?
Do you think it only bothers us now and that once the interior is painted white, it won’t be so noticeable anymore?
Many sunny greetings!
I have a question for all home builders!
We have had our windows installed for a few days now and were quite excited. Unfortunately, we are a bit disappointed because the window panes have a noticeable green tint. We never discussed the glass with the window installer, as it never occurred to us that window glass might not be completely clear.
Apparently, we received some kind of "insulated glass" with a coating. We really don’t like the green tint; it makes everything look dull and even makes us look a bit "sick" ourselves... :-( It feels like we have the glass from a light sunglasses lens as a window, instead of “real” windows!
How is it with your windows?
Is it normal for triple glazing to have some kind of color tint?
Do you think it only bothers us now and that once the interior is painted white, it won’t be so noticeable anymore?
Many sunny greetings!
As expected. The glass is state-of-the-art, high-performance thermal insulation glass, with double coating on both the inner and outer panes. This means it keeps the cold inside the house while also reflecting solar heat outside.
The window manufacturer, of course, says we ordered the windows with this U-value, so that’s what we get...
In the end, we would end up paying extra if we insist on different glass. My husband already says so, because he believes that good glass and natural light contribute to quality of life permanently, but I’m not so sure anymore. Everything has its pros and cons.
Well... for now, we’ll wait to see how it looks once everything is plastered and whitewashed. But the difference compared to double glazing is definitely noticeable. Yesterday, my husband removed a basement window and held it right next to the triple glazing...
What kind of “g-value” and light transmittance do you have?
For us, the Ug value is 0.5 and the g-value is 35%, with light transmittance at 55%.
The window manufacturer, of course, says we ordered the windows with this U-value, so that’s what we get...
In the end, we would end up paying extra if we insist on different glass. My husband already says so, because he believes that good glass and natural light contribute to quality of life permanently, but I’m not so sure anymore. Everything has its pros and cons.
Well... for now, we’ll wait to see how it looks once everything is plastered and whitewashed. But the difference compared to double glazing is definitely noticeable. Yesterday, my husband removed a basement window and held it right next to the triple glazing...
What kind of “g-value” and light transmittance do you have?
For us, the Ug value is 0.5 and the g-value is 35%, with light transmittance at 55%.
D
DerBjoern26 Jun 2015 09:13But this is not due to triple or double glazing. We also have triple glazing, and the panes are completely clear.
Is this greenish tint appearing from the outside to the inside, from the inside to the outside, or both?
In our case, I feel that it’s harder to see inside when the room is dark, which is actually a positive aspect, but I haven’t noticed a greenish tint.
However, you don’t seem to be the only one experiencing this when searching for “greenish tint” and “windows” on Google. This is caused by the iron oxide in the glass.
I found a table from 2009 that suggests a tendency: the lower the solar heat gain and the better the U-value, the lower the light transmission. Of course, a lot might have changed in the six years since then.
In our case, I feel that it’s harder to see inside when the room is dark, which is actually a positive aspect, but I haven’t noticed a greenish tint.
However, you don’t seem to be the only one experiencing this when searching for “greenish tint” and “windows” on Google. This is caused by the iron oxide in the glass.
I found a table from 2009 that suggests a tendency: the lower the solar heat gain and the better the U-value, the lower the light transmission. Of course, a lot might have changed in the six years since then.
The green tint is mainly noticeable when looking from the inside out. The "green" effect is especially visible when the sun is shining and you hold something white up to the window. Under cloudy conditions, it simply appears a bit darker, like a very slight tint. In our current apartment, we have 20-year-old windows with triple glazing, which are uncoated and completely clear glass.
@DerBjoern Honestly, I can’t imagine that your windows have triple glazing and are not significantly darker than old double glazing. At least, from what I have heard and read so far, metal coating or metal film is standard for triple glazing nowadays. And that’s exactly what darkens the glass. Do you perhaps have the datasheet on hand and could share your values with me?
U-value
Solar heat gain coefficient (SHGC) / g-value
Visible light transmittance
@DerBjoern Honestly, I can’t imagine that your windows have triple glazing and are not significantly darker than old double glazing. At least, from what I have heard and read so far, metal coating or metal film is standard for triple glazing nowadays. And that’s exactly what darkens the glass. Do you perhaps have the datasheet on hand and could share your values with me?
U-value
Solar heat gain coefficient (SHGC) / g-value
Visible light transmittance
Maybe a quick note for those still deciding on their windows. Don’t base your choice solely on the thermal insulation value; make sure to review the complete datasheets of the windows offered.
Glaswelt schrieb:
- Ug-value (thermal transmittance): This describes the heat loss from inside to outside. A Ug-value of 0.7 W/m²K (0.12 Btu/h·ft²·°F) means that per square meter of glazing and per degree of temperature difference (inside to outside), 0.7 watts are “lost.” It is a measure of heat loss, so the lower the value, the better the insulation.
- g-value (total solar energy transmittance): This describes the unique property of glass to allow energy gains (from outside to inside).
- Light transmission (TL) describes the portion of incoming visible light that passes through the glazing. The human eye can perceive wavelengths between 380 and 780 nm.
- Selectivity refers to the ratio of light transmission to total solar energy transmittance.
- The color/neutrality of glazing. This characteristic can be difficult to describe. The Color Rendering Index Ra characterizes the change in color of an object as a result of the light passing through the coated glass. Ra = 100 is the theoretical optimum. A value above 80 is considered good color rendering, while values above 90 are regarded as very good.
D
DerBjoern26 Jun 2015 10:23Our windows have the following specifications:
Triple glazing
Ug-value: 0.5
g-value according to DIN EN 410: 50%
Light transmittance (D65) tv: 70%
External light reflectance (D65) rv: 17%
Color rendering index Ra: 97%
b-factor (shading coefficient): 0.63
It is clear that double glazing can allow more light to pass through. I don’t want to deny that. Friends of ours have windows with the coating you mentioned, and there is a noticeable difference compared to our panes. I noticed it immediately when I entered their house. Their windows were not greenish but rather slightly darkened, like sunglasses, although only very mildly. With our windows, the colors appear significantly more natural.
Triple glazing
Ug-value: 0.5
g-value according to DIN EN 410: 50%
Light transmittance (D65) tv: 70%
External light reflectance (D65) rv: 17%
Color rendering index Ra: 97%
b-factor (shading coefficient): 0.63
It is clear that double glazing can allow more light to pass through. I don’t want to deny that. Friends of ours have windows with the coating you mentioned, and there is a noticeable difference compared to our panes. I noticed it immediately when I entered their house. Their windows were not greenish but rather slightly darkened, like sunglasses, although only very mildly. With our windows, the colors appear significantly more natural.
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