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How To Stop Condensation In Your Home
Quick answer
How To Stop Condensation In Your Home
Why condensation happens
Warm air holds more water vapour than cold air. When warm, humid indoor air touches a surface cooler than its dew point, it can no longer hold that vapour and water condenses out. Everyday living adds a great deal of vapour: showering, cooking, washing up, drying laundry and simply breathing can easily contribute more than ten litres of water a day in a family home.
Older houses lost that moisture through draughts, open chimneys and single-glazed windows. Modern draught-proofing removed those losses without necessarily replacing them with controlled ventilation, which is why condensation complaints have risen alongside energy efficiency improvements.
Free changes that make a measurable difference
Put lids on pans, close the kitchen door while cooking and keep the extract running for fifteen minutes afterwards. Dry laundry outdoors when you can; if you must dry indoors, use one room with the door closed and a window slightly open, or a condenser dryer vented properly.
Keep heating steady rather than in short bursts. A house held at a moderate temperature has warmer wall surfaces and therefore a lower condensation risk than one that swings from cold to hot twice a day. Leave a gap between furniture and external walls, and open trickle vents.
Ventilation upgrades that work
Most bathroom fans move far less air than their rating suggests, because of long flexible ducting, missing shutters and short run times. A continuous-run humidistat fan with rigid insulated ducting is a modest job with a large effect. Kitchens benefit from a properly ducted extract rather than a recirculating hood.
Where a whole property is affected, positive input ventilation is often the most cost-effective answer. A loft-mounted unit gently supplies filtered air, diluting humid internal air and displacing it through natural leakage paths. In new or heavily refurbished homes, mechanical ventilation with heat recovery achieves the same with less heat loss.
When to get a specialist involved
If mould keeps returning after cleaning, if windows stream every morning through the winter, or if you cannot tell whether the damp is condensation or something structural, monitoring is the answer. Data logging temperature and humidity over a week gives an objective picture that guesswork cannot.
We also look for the physical reasons surfaces are cold: uninsulated lintels and reveals, missing cavity insulation, cold bridging at floor junctions. Raising surface temperatures and lowering humidity together is what produces a permanent result.
Step by step: How to stop condensation in your home
A seven-step routine for cutting indoor moisture, ventilating effectively and keeping surfaces above dew point.
- 1
Measure your indoor humidity
Place a hygrometer in the worst-affected room and record readings over several days. Persistent readings above 60% relative humidity confirm a condensation problem rather than a leak.
- 2
Cut moisture at source
Cover pans while cooking, dry laundry outdoors or in a vented tumble dryer, and keep bathroom and kitchen doors shut while moisture is being produced.
- 3
Use extract fans properly
Run the extract fan throughout showering or cooking and for at least fifteen minutes afterwards. Check the fan actually moves air and terminates outside, not into a loft.
- 4
Open background ventilation
Keep trickle vents open through winter and air rooms briefly each morning so moist night-time air is replaced with drier outside air.
- 5
Keep heating steady
A low continuous background temperature keeps wall surfaces above dew point far more effectively than short bursts of high heat in the evening.
- 6
Free up cold surfaces
Move furniture a few centimetres off external walls and avoid packing wardrobes against cold corners so warm air can circulate behind them.
- 7
Treat and monitor affected areas
Clean existing mould with a suitable fungicidal wash, redecorate once dry, and keep logging humidity to confirm the changes are working.
Common questions about this topic
What humidity should my home be?
Between 40% and 60% relative humidity is the comfortable, low-risk range. Above about 70% at a wall surface, mould can grow.
Do dehumidifiers stop condensation?
They reduce it effectively and are a useful interim measure, but ventilation and heating address the underlying cause.
Need professional advice?
Book an independent damp survey and get a written diagnosis for your property.
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