Hey folks! I've got a second-floor bathroom that's currently unvented, and it gets really humid during showers, especially in the summer. I'm looking to install a bathroom vent fan but unsure how to vent it properly for Minnesota's cold climate. My attic is mostly uninsulated, so access is easy right now.
Originally, I thought about venting through the soffit, but I've heard mixed advice on that—some say the moisture just goes back into the attic through the soffit vents. Could I cover up those nearby soffit vents, or is that a no-go?
I also considered venting straight through the roof, which doesn't seem too steep, but I worry about snow blocking it. Lastly, going out through the wall seems tricky since the fan would be in the ceiling of the bathroom. Any thoughts on the best venting option for these conditions?
3 Answers
Going through the roof is actually the best method. I did it on mine and it was pretty simple. Just take your time with a jig saw to cut the hole and use the right sealant. I managed to do it in about 15 minutes, and I switched to larger ductwork which really helped with airflow. Just make sure to maintain proper height for the vent to keep it free from snow blockage.
Definitely check your local building codes; following them will ensure you're compliant! I’ve only ever vented upper-level bathrooms through the roof, trying to keep the duct run as vertical as possible with a proper roof vent kit. It makes for less hassle overall, especially in snowy areas.
Venting through the nearest gable end is generally your best bet. Make sure to use rigid ducting instead of flexible, and insulate it according to local codes. I'd also suggest getting a good quality metal exhaust hood with a magnetic flap because those cheaper plastic ones can be less effective. Don't forget to check if you need a permit for the installation!
A dehumidifier could be an extra help if you’re worried about moisture!
If you’ve got a hip roof, that might change things a bit. Pay attention to how that could affect venting!