Home & Garden

Moisture in windows

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  • Dec 11th, 2016 6:29 pm
[OP]
Deal Addict
Apr 9, 2008
2885 posts
226 upvotes
Toronto

Moisture in windows

The window glass is all wet from inside in the morning. There is a layer of water on the window frame.
The window opens towards east, roughly 6 ft by 5 ft.
I can easily fill a cup of water from it.

That room is also more cooler than rest of the house and also farthest from the heater.

The same size window in another room opening west does not have any moisture inside.

Any ideas why its happening? is it normal? the house is less than 10 years old.
33 replies
Deal Addict
Feb 29, 2012
2654 posts
1459 upvotes
Richmond
It's normal for water to condense on the inside of cold windows in the winter. It happens less if the humidity in the house is lower, or if the window is in a warmer room, or with double-pane windows that insulate better.

If the condensation is on the inside of a double-pane window between the panes, it means that the seal between the panes is broken and needs repair. Unfortunately that happens to almost all double-pane windows and glass doors eventually, and the repair is expensive.
Deal Fanatic
Dec 5, 2009
5740 posts
3568 upvotes
What's the humidity in the room? If you don't know then that's the first thing to check. You can buy a humidity meter for a few bucks.
Deal Addict
User avatar
Sep 5, 2004
4565 posts
1211 upvotes
Guelph, ON
If windows wet on inside, you need an HRV, house to air tight. Many new cities, like in Guelph ON, have it part of building code for new homes. You can retrofit an HRV into an existing home without any issues as well.
Deal Expert
User avatar
Feb 8, 2014
24123 posts
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Socially Distanced
Cold air holds less water then warm air, this is no surprise at all.
Is this room insulated, heated, thermally isolated form the house, not?
What kind of window, whats the relative humidity in this room and the rest of the house, is there a closed door between them whats the air leakage of the house, is there a basement underneath, what is the house made out of.
Is there ductwork, what size is it, are there returns, are any dampers or vents closed
As you can see this is hard to diagnose online, but i guarantee there is a logical explanation.
In fact in Rand McNally they wear hats on their feet and hamburgers eat people
Deal Guru
Mar 14, 2005
13811 posts
2498 upvotes
A heater vent is supposed to be located under the window so that there is air flow to the window to prevent condensation from forming. So, if u don't have a vent there, then try to increase air flow to the window in other ways (eg. open the curtains).
[OP]
Deal Addict
Apr 9, 2008
2885 posts
226 upvotes
Toronto
Becks wrote: A heater vent is supposed to be located under the window so that there is air flow to the window to prevent condensation from forming. So, if u don't have a vent there, then try to increase air flow to the window in other ways (eg. open the curtains).
heater went is right under the window.
blinds and curtains only closed during the night. they are open during the day every day.
[OP]
Deal Addict
Apr 9, 2008
2885 posts
226 upvotes
Toronto
Faith24 wrote: It's normal for water to condense on the inside of cold windows in the winter. It happens less if the humidity in the house is lower, or if the window is in a warmer room, or with double-pane windows that insulate better.

If the condensation is on the inside of a double-pane window between the panes, it means that the seal between the panes is broken and needs repair. Unfortunately that happens to almost all double-pane windows and glass doors eventually, and the repair is expensive.
its a single pane window and there are three of them.
[OP]
Deal Addict
Apr 9, 2008
2885 posts
226 upvotes
Toronto
fdl wrote: What's the humidity in the room? If you don't know then that's the first thing to check. You can buy a humidity meter for a few bucks.
You think there is extra humidity in the room causing the wetness?

it does not happen to the other rooms in the house.
[OP]
Deal Addict
Apr 9, 2008
2885 posts
226 upvotes
Toronto
Faith24 wrote: It's normal for water to condense on the inside of cold windows in the winter. It happens less if the humidity in the house is lower, or if the window is in a warmer room, or with double-pane windows that insulate better.

If the condensation is on the inside of a double-pane window between the panes, it means that the seal between the panes is broken and needs repair. Unfortunately that happens to almost all double-pane windows and glass doors eventually, and the repair is expensive.
I was thinking the high condensation is related to that room being extra cold than rest of the house and has to do with windows not properly insulated causing cold outside air to enter the room.
Member
May 1, 2007
381 posts
177 upvotes
Toronto
bsobaid wrote: blinds and curtains only closed during the night. they are open during the day every day.
This will do it. Open them up during the day and the water should evaporate (until it just freezes and stays there until the spring).
Deal Addict
Dec 19, 2009
4716 posts
2643 upvotes
bsobaid wrote: its a single pane window and there are three of them.
Are the windows in other rooms single pane?
Deal Fanatic
Dec 5, 2009
5740 posts
3568 upvotes
bsobaid wrote: You think there is extra humidity in the room causing the wetness?

it does not happen to the other rooms in the house.
Possibly. But the point is to know exactly what you are dealing with. At cold enough temps outside and at high enough humidity ALL windows will have condensation. Your windows could be leaky, but you may also have the humidity too high in your house or in that room. Also leaving the curtains open and vents open will help
Deal Guru
Mar 14, 2005
13811 posts
2498 upvotes
If the house is less than 10 yrs old, why do u have single pane windows? Single pane windows get condensation because they are cold, and humid air will condense as soon as it hits the cold glass.
Jr. Member
Sep 16, 2014
112 posts
14 upvotes
Canada
This happens quite often in winters.
My house is 5 yrs old , double pane windows , and have the condensation .
I have reduced the humidity and opened the curtains ,which in turn solved the issue.
But not too sure what to do at night times , when the curtains/window covers are closed , the condensation happens by morning Smirking Face
Deal Guru
Jan 25, 2007
11479 posts
6666 upvotes
Paris
The windows aren't single pane if house is 10 years old. The gas is probably gone from the windows and the closed blinds act as an insulator making more condensation.
Deal Guru
Jan 25, 2007
11479 posts
6666 upvotes
Paris
Also, builder grade windows are the minimum POS windows you can get. Better windows don't condensate except in extremes (-40 outside and 45% RH inside)

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