Excess condensation over second floor shower

4 years ago

We are getting a lot of condensation/moisture when we run the shower in a second floor bathroom - to the extent that there is damage and discoloration on the ceiling drywall. It is possible that there is too much of a disparity between the attic temperature and the running shower (even when the water is not super hot) and that is causing the extra moisture. If we pull any insulation out from over the shower area, would that help? We are going to replace the drywall, but want to stop the problem at its origin.

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Comments (4)

millworkman
4 years ago
last modified: 4 years ago
Bathroom fan running during and for 30 - 45 min after showering?
mirandala
Original Author
4 years ago
Yep - new fan installed and venting through the attic to the outside. Exhaust fan passes the TP test, so has decent power.
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ci_lantro
4 years ago
How closed up is the shower? How far is the fan from the shower & how large is the bathroom? What is the ceiling height? Make sure that the CFM rating on the fan is suitable for the cubic feet size of the bathroom.

Lastly, what kind of shower head do you have? Asking because I have a low flow shower head that looks like this:

I like it a lot but it does break the water up into a fine streams and seems to create more steam/ finer droplets than shower heads with a coarser stream.
HU-93998753
4 years ago
Hi, If your fan is rated at 150 CFM and with the door closed the space under the door only allows say 25 CFM then that is good as it gets. To test take a shower with the door half open and see if the mirror steams up. I have put Louvers in doors to cure the problem.

Good Luck Woodbutcher