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November 14, 2007

window condensation

Any advice on how to solve a window condensation problem?

I just purchased the building in June, so this is my first winter with it. The problem appears to have existed before my renovation because the old window sills were rotted (probably the original 100+ years old) and there was condensation between the original double pane windows.

The problem only seems to occur on the 3rd floor (top floor, brick building). The tenants mentioned there are puddles on the window sill in the morning.

Besides the obvious quick solution, a dehumidifier, can anyone offer their actual experience in solving this problem? Or perhaps keeping their bathroom vent fan running? I've been reading about "trickle vents," but that seems to be more of a U.K. thing.

thanks!

Posted by guest at 11:11 AM | Comments (4)

Comments

Sounds as if the windows with the condensation issue need replacement... the seals are broken causing the condensation in between the double panes... nothing will make it go away, not a dehumidifier or an open vent fan.

Posted by: bren at November 14, 2007 11:33 AM

Thanks Bren.

I actually already had the window glass replaced - now the condensation is just collecting on the outside of the glass and causing puddles on the window sill.

I'm basically trying to find a way to eliminate/decrease the condensation. At least enough not to cause puddles on the window sill.

Posted by: guest at November 14, 2007 11:45 AM

Sounds like the humidity in the room may be too high. Do you have a steam boiler? Maybe there is a defective air valve on a radiator that is giving off steam that is then condensing on the cold glass. Do they have a exhaust fan in the bathroom? Do they take long steamy showers? Get a small humidity gauge from the hardware store and take a reading. Too much humidity is actually bad for your health. I think 30% is about right, but you can look it up to be sure. Sometimes new construction with super insulation and very little air exchanges have this water problem

Posted by: guest at November 14, 2007 9:09 PM

thanks guest 9:09 ...

After doing some more research - you are correct, it seems the condensation problem is always related to humidity and not the windows. Since the apartment was just recently renovated, it's definitely more air-tight, and apparently the new materials (sheetrock, wood molding, etc) still may have some moisture that's released when the heat it on.

I'm also going to try and replace the air valves and make sure the tenants use the bathroom exhaust fan while taking a shower.

Posted by: guest at November 14, 2007 10:59 PM

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