Low E windows

Old 08-25-01, 05:04 AM
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I just replaced all the window in our home with windows from Thermal Industries, Inc. These windows are low-e argon filled windows. I am having a problem with condensation on the outside of the windows. I'm now hearing that this is a fairly common complaint with the newer low-e windows. The company is going to replace the sashes but I'm not sure if I want low-e now. Have you heard any complaints about low-e or condensation on the outside of window panes?
Old 09-04-01, 02:47 PM
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The same happened to me with brand new (less than a week old) Simington windows in the first few days.

The firm that did the installation's manager said "It's the difference in temparature" and the moisture is on the outside of the glass and goes away. In any event I can not see out of the window in the AM. I will say the low-e is MUCH cooler in the sun and should help preserve the carpets and art in our house. BUT why does this happen?
Old 09-04-01, 05:29 PM
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I have put in alot of replacement windows and I have never had this problem. But, I also have to admit that I'm not fond of plastic windows either.

In order to have condensation you must have cold glass and warm moist air. Problem is, short of having faulty glass, the only thing I think of is what I have noticed when insulating new homes.

What I find is that most installers do not check to see if the sides are parallel top to bottom. These windows are very flexable and the installers are pressed for time. Also , if the framming of the window was warped that could provide for a very small seperation of the sash and frame. You would be surprised at how little it takes. If this is the case then any warm air escaping might condensate on the exterior glass. Also, if the window gaps were not foamed and cracks sealed with caulking then the same thing could happen. One other thing that I have notice with tall (48"+)
plastic windows is that they can, and probably will, flex under wind loads and that might also be a factor.
You could also have a seal problem between the sash and frame. Check and see if the seals are not damaged or short in any areas ajacent to the problem area.

I know that I have replaced plastic with alum covered wood when the home owner could not get a fix.

Hope you get a cure.


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