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Current situation

My bathroom looks like this:

bathroom plan + pictures

The problem is that I face some mild humidity issues (on ceiling and tile grout), as it is difficult to extract air after having taken a shower.
Indeed, it happens that the door is virtually air-tight.

This makes that none of the ventilating strategies below is really effective:

Strategy Extractor fan Window Door Result
1 on closed closed Fan is not powerful enough to suck enough air through the door, so the flow doesn't seem sufficient to prevent condensation on walls and ceiling.
2 off open closed Usually not sufficient enough, plus is a bit of an issue in winter as the dormer window can't be open/closed easily (too high); plus leaving it open constantly isn't very pleasant in the morning).
3 off closed open Humidity goes in the flat, and low air circulation within the bathroom makes that there is still condensation.
4 on open closed The air extracted by the fan… is mostly that that just entered through the window, so it's not effective.
5 on closed ajar Works, but the sound of the fan — despite being not very loud — is bothering as the bedroom & home office are located right in front of the bathroom, so still not optimal.
6 off open ajar Most effective solution, yet leads to draught and slamming doors ; plus isn't really possible during winter months.

So I think that strategy #1 would be ideal… should the hallway → bathroom air flow be greater. I don't think a more powerful extractor fan would be of much help in the current configuration… plus it's likely to be even noisier.

Questions:

  1. Would trimming the bottom of the door (to let more air from the hallway in) be a good idea?
  2. If so, how much should I trim?
  3. Would a circular saw (with a guide) be the right tool to do it?
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    How humid is the house? When do you turn the fan on? Have you checked if the fan and duct is clean? This link might give some more ideas. diy.stackexchange.com/questions/175284/…
    – crip659
    Sep 11 at 11:07
  • @crip659 1/ The house is globally sound and dry. 2/ I turn the fan when I enter the bathroom. It can take a good few hours (with fan on/door closed) for most of the humidity to be extracted. 3/ Except a bit of dust and some light cobweb, the duct is unobstructed and the air can flow freely. I've cleaned the fan. 4/ Thanks for your comment and the link.
    – ebosi
    Sep 11 at 11:16
  • I have also considered removing/thining the skirting board (that is taller than floor level), but 1/ I'm not sure it's a good idea and 2/ I can't seem to be able to remove it without damaging it (or the flooring on either side).
    – ebosi
    Sep 11 at 11:19
  • The fan is close to the door. Most extra air coming though the door will go right to the fan and not help much. Think a small fan to move the air around the room will help more.
    – crip659
    Sep 11 at 11:24
  • 1
    A door air vent near the bottom of the door would look better than a gap under the door. Sep 11 at 11:35
1

Can't tell what's above the room, but if possible, a ceiling vent would be a good idea. As far away from the fan as possible - and it wouldn't look out of place, would save the door, and be simple to change with a piece of plasterboard later if needed.

1
  • Thank you for the suggestion — I'm sorry I didn't mentioned I live in an appartment, so drilling through floor/ceiling is not an option in my situation.
    – ebosi
    Sep 11 at 15:05

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