mould windowless bathroom
Why a portable unit in the lounge will not fix black silicone, and how to spec an extractor with a humidistat.
Updated 2026-09-01 · 6 min read
A windowless bathroom makes vapour in bursts. If it cannot leave, it condenses on mirror, silicone and ceiling. A lounge dehumidifier sees little of that.
You can, but you are treating whole-home air while vapour is made in a sealed box. The extractor is the bathroom tool.
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40–180 €
In a windowless bathroom this often beats a portable dehumidifier: it removes vapour at the source.
When: Bathroom mould, daily showers, poor air change.
Not when: It will not fix a thermal bridge in a bedroom.
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8–25 €
Existing mould has to be removed. Anti-mould paint alone, if moisture stays high, is a delay.
When: After you understand the cause, while RH is being lowered.
Not when: Large areas, strong odour, vulnerable occupants: consider a professional.
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WHO guidelines for indoor air quality: dampness and mould (2009)
Sintesi epidemiologica su umidità indoor e sintomi respiratori. Non è una linea guida clinica italiana.
Accessed 2026-09-01
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