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Bathroom Ventilation & Mould Prevention
As important as waterproofing but often skipped: proper ventilation stops mould at the source.
2026-06-17 · 5 min read
Mould comes as much from poor ventilation as from bad waterproofing. A bathroom that can't expel moisture will grow mould even with the best materials.
This article is part of our Istanbul bathroom renovation guide: what drives the cost, the right order of work, waterproofing and how long it takes.
What does good ventilation look like?
Windowless bathrooms need a humidity- or timer-controlled extractor fan that runs 15–20 minutes after a shower. Even with a window, a fan is advised for heavy use.
Frequently Asked Questions
- Does a fan fully prevent mould?
- A correctly-sized fan plus good waterproofing and regular cleaning together prevent mould almost entirely.
Planning a renovation?
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