Extractor Fan from Bathroom to Attic

Negative Waves · 30-05-2026 04:38PM #1

Hi All,

We had two bathrooms completed in October 2024 that cost us a fortune. I've just been up on in the attic and noticed the extractor fan ducts leading from both bathrooms just exit straight out into the attic. I've been reading on the internet about how this is not good. Pure laziness out of the guy we hired as there were already two outlets to the roof existing in the attic.

Just wondering how bad this is and what I should do about it? I'm not very technically minded and dont have much practical experience of this stuff. Kicking myself that I've only noticed this now. I did notice mould on items we had up in the attic a few months back but didn't connect it to the bathroom renovations.

Unfortunately we did not part on good terms with the contractor…

winklepicker2025 · 31-05-2026 07:21AM

just get them piped up too & out the roof.

1-2 hrs work in it

naughtysmurf · 31-05-2026 07:55AM

yes, it was lazy but any easy & cheap enough fix

Cerco · 01-06-2026 02:31PM

If you leave them as they are there will be a bad smell in your attic.

DublinDilbert · 02-06-2026 09:53AM

Get two roof tile vents fitted and connect the ducts to them. If they are a long run of duct make sure it is supported and consider insulated ducting.

Negative Waves · 02-06-2026 11:46AM

Thanks for all the replies guys. This is something I felt was beyond my capabilities so I reached out to the contractor again. He claims he ran the ducts out to the eves of the roof and that they must've "snapped back". One of them must've done a fair amount of snapping as it exits right into the centre of the attic, a good 10-12 feet from any eves.

I can see no evidence of any structure that may have held these ducts. He also said the existing vents to the roof are for the sewers and that he cant connect to them as it would bring smells back into our bathrooms.

He says he'll come back and extend them to the eves, as the eves are cross ventilated.

Is this a practical solution? Seems the ducts have a fair distance to go to exit via the eves?

Thanks again.

dathi · 02-06-2026 12:52PM

He says he'll come back and extend them to the eves, as the eves are cross ventilated.

Is this a practical solution? Seems the ducts have a fair distance to go to exit via the eves?

no do what dublin dilbert says

Negative Waves · 02-06-2026 01:10PM

Thanks,

Here’s some pictures of the way it was left. As you can see, they were simply laid across the insulation with no supporting structure. The ducting is not insulated.

Extractor Fan from Bathroom to Attic

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