How to Dehumidify a Bathroom

28th Sep 2018 | |

It’s getting to that time of year again when bathrooms could start getting mouldy from lingering condensation.  The air is cooler, so external walls can become cold and the humidity (from showers etc) condense on this cold surface.  Over long periods this condensation on surfaces can lead to mould growth.

To help keep this condensation and mould to a minimum we’d briefly recommend the following considerations:

  • If you have a window, leave it open as much as possible, particularly at shower time;
  • For an internal bathroom, without a window, it could be worth considering leaving the bathroom door open during the day, to help dilute the humid air into the rest of the property and reduce concentration of humidity in the bathroom;
  • Ambient warmth at a good level would help keep walls warm, so if you have a heater consider running it for a reasonable amount of time particularly after showering;
  • If the bathroom has heavy use, it may even be useful to wipe down moisture from the walls to remove surface water;
  • Running a dehumidifier could be useful if ventilating the bathroom and rest of the property is difficult. A domestic-type dehumidifier could be sufficient to reduce humidity to a more stable level soon after the bathroom has been used.

If you have a water damaged bathroom, such as from a leak from a room/property above then it is important to evaluate whether water may have got behind wall or floor tiles.  If the property is wet behind tiles, this can be difficult to dry out without removing the tiled covering.  Assessing this can be undertaken with damp testing equipment that companies such as ours use.

Other leaks we regularly see are from flush pipe connections underneath cistern tanks, we well as water supply pipes to the side of cistern tanks.  We would suggest regular inspections for these type of plumbing setups, particularly where the plumbing is concealed.

A dehumidifier for drying a bathroom leak could be either a domestic-type or a small industrial machine, depending on overall room size. Where water may have got under baths/showers or even under floor voids, then fans may be required in order to circulate dry air into the concealed spaces.

For any advice on bathroom dehumidifiers in your home or commercial property, please contact us on 020 7760 7660 or