Window condensation / sweats

[Abby Normal]

I can never remember if the indoor/outdoor air films are already counted in the R-value of the glass.

[jolt]

Your right I should use my reading glasses when I use a Psychometric Chart. At 37 degrees the glass temperature reaching dew point is more likely. Dry bulb wet bulb temps with my background were use to calculate superheat or subcool.

[Abby Normal]

Lol good advice, i sound like a parrot

[jolt]

Is the house on a slab, crawl space or basement? Does it have a humidifier?

[Joseph Meehan]

Likely the high rating you are seeing is for the glass and maybe for air sealing, but overall, those cheap frames sure reduce the real world efficiency.

[Joseph Meehan]

I find that true to some extent. Maybe not a year, but in this case the owner has measured humidity at 30%. Of course it may not have been an accurate measure.

[Noozer]

Either the windows/frames are having problems, or your hygrometer (clock) is wrong.

I'd pick up another hygrometer to just to be sure.

[Abby Normal]

The colder an environment, the more noticable the mositure of new construction. Ventilatiojn schems like an HRV will work overtime the first winter after new construction in a cold climate. The next winter they can over ventilate to the point people want to add humidifiers

[avid_hiker]

Have you spoken to your neighbors as of yet?

[scottieyoon]

[scottieyoon]

Not yet, but the good news is that the problem is gone. Here is what I did.

I had my wife circulate the air by opening the back door for fresh air and put the fan "on" instead of "auto". By the time I got back from work, I had to clean up the water but I haven't seen the problem again for last few days. I also got two hygrometers, one analog and one digital, and they had ranged between 35% to 42% at given moment. Even with the wide range I think I was still at near "dry" condition.

I believe the main problem was the rapid drop in temperature in addition to new construction in first winter. I took the reading in bathroom when I took a shower and it was at 53% (highest). I ran the bathroom fan for about 30 minutes and it went down to 33%. I think I'm gonna use the fan during shower during winter.

Thanks guys.