High humidity levels in condo

Old 04-10-23, 05:00 PM
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High humidity levels in condo

Hello all. I was hoping I could get some thoughts on the high level of humidity in my condo unit. In the winter, the humidity levels are getting into the 50/60s with heavy condensation on the windows. High humidity during the other seasons too. Any thoughts on what could be causing this? Do you think I would need an air exchange system? Would an ERV or HRV be recommended and what sort of space would this take up? Could it be mounted in the roof?

Additional details... I live in Milwaukee (so the weather can be extreme on both ends) on the top floor of a 4 story/4 unit walk up. Other neighbors do not have this issue. Issue seems to have cropped up after the installation of a new roof. The roof is flat, unvented, and is a TPO roof. I believe the roof is insulated with some sort of “iso“ insulation, I do not have more info. The building is about 15 years old with a brick exterior (doesn’t seem new enough to be too tight?) I’ve been told the building is well flashed. I tested the bathroom, kitchen, and dryer vents. They all seem to be working and venting to the outside. High humidity persists even when I’m out of town so I do not think it’s due to my behaviors. I don’t think there are any leaks in my pipes because I would think I would have noticed at this point. HVAC guys looked at the unit and said it looks fine.

Thanks in advance.
Old 04-10-23, 05:47 PM
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High rises require a large outside air duct piped into the AC mechanical room in my area.

A 10 inch round outside air duct is present in the building that I work in most often.

I usually check if it has a damper and if the damper is wide open.

Old 04-11-23, 09:06 AM
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Additions to indoor humidity are showers, un-vented dryers, and cooking. Higher levels of humidity coming from other sources would be so remote!

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