Fitting and design
Ventilation strategy for a bathroom that stays dry
Condensation problems are almost never caused by the tiles. They are caused by moist air staying in the room long enough to condense on the coldest surface.
The detail that matters
- 1
Extraction rate, duct route and make-up air all have to work together, a well-sealed door with no undercut starves the fan.
- 2
Cold external walls behind furniture are where mould appears first, so insulation and airflow matter as much as fan choice.
Your questions answered
Is opening a window enough?
Rarely in winter, when people close it quickly. Mechanical extraction with an overrun is more reliable.
Why is there mould after a refit?
Usually because a new, better-sealed room lost the accidental ventilation the old one had.
Ready to get the room measured up?
Photos of the existing room and the position of the soil stack help enormously before a visit.