Latest Discussions : Windows & Doors


10:01AM | 10/23/05
Member Since: 10/22/05
1 lifetime posts
Hi, my wife and i purchased a 5 year old house and we have been having lots of condensation on all the windows in the entire house, except the basement windows. We are afraid that this is going to cause rot and mold. This olny happens in the winter or whenever we have the furnace running. We have gotten all of our windows caulked and i have completely turned of the power humidifier, but our windows are still covered in water everymorning. Can someone please tell me how to fix this, before it leads to other major problems. I would greatly appreciate, thanks.


04:54PM | 10/23/05
Member Since: 04/25/05
1915 lifetime posts
You need to get a humidity guage and monitor the level inside the house and report back.

Also give some more details on the construction of the house (is it "tight") and what kind of windows.

Also where you are located.

High moisture levels are can be caused by leaks, but also by moisture given off by the residents.

Do you regular use the bath fan and kitchen fan?


06:29PM | 10/24/05
Member Since: 09/09/05
21 lifetime posts
Ventilation is obviously very important if your humidity levels are high. A couple more things to look at...

First, how are your window coverings installed, and what are they made of? It is human nature that when condensation appears for people to cover the windows more tightly with fabric shades, tight blinds or heavy curtains. This may seem like you are helping to insulate better, but it is 100% the wrong thing to do and will make condensation worse.

It is absolutely necessary that air flow from the home to be able to pass over the glass surface. Blinds, shades, and curtains should be hung with enough space at the top and bottom to allow air to flow behind. If not, your glass temperature will drop, which lowers the temperature at which condensation will form.

The recipe to controlling condensation is to lower humidity and water vapor levels while making sure you are doing everything possible to raise the resistance of the windows to condensation.

This can be impossible if it is a problem with the windows themselves. Are they cheap builders units? Do they have low-e glass? Do they leak air? Do they have a metal glass spacer that will transfer cold from outside to inside? What u-value and CRF (condensation resistance factor) do they have? Lots of questions for you to find out the answers to in able to diagnose your true problem.

After all, you can't expect a low grade window to perform like a quality well insulated window. A common bulders unit with a u-value of .49 only has a total window R-factor of R-2. Compare that to premium vinyl windows with u-values at or near .20 which have R-10 center of glass R-values and R-5 total window values and you can see that there is quite a difference.

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