18/08/2026
Bathroom ventilation: why your bathroom is a mould factory.
Your bathroom is the most moisture-rich room in your home. Every shower, every bath, every sink use releases water v***r into the air. That moisture has to go somewhere, and if it doesn't have a proper escape route, it stays in your bathroom and creates the perfect environment for mould.
This photo shows a bathroom ceiling with visible water damage and mould staining around the ventilation fan. The fan is there to extract moisture, but if it's not working properly, blocked, or undersized for the room, it can't do its job. Moisture builds up, condenses on cold surfaces, and mould takes hold.
The problem gets worse in winter. Cold bathroom walls and ceilings mean moisture condenses faster. Mould thrives. And if the mould is in the ceiling void or loft space, you might not even see it until there's serious damage.
The fix depends on understanding what's happening. Is the extractor fan working? Is it powerful enough? Is the ducting blocked? Is there enough air circulation? These are the questions we answer with a proper survey.
A thermal imaging survey shows us exactly where moisture is concentrating, and we can recommend the right ventilation solution—whether that's upgrading your extractor fan, installing a PIV unit, or improving air circulation.
If your bathroom is steamy, your windows are always fogged, or you're seeing mould, your ventilation needs attention.
www.fullst.co.uk