Search Results

What Causes Condensation?

Condensation occurs when warm air collides with cold surfaces, or when there's too much humidity in the atmosphere. When this moisture-packed warm air comes into contact with a chilly surface, it cools down quickly and releases the water, which turns into liquid droplets on the cold surface. Through the daily routine of showers, baths, boiling kettles, cooking, drying clothes and breathing a family of 4 will contribute approximately 4 pints of water per person a day, equal to over 100 pints of water vapour a week, which has to end up somewhere.

Arrange a Survey Lack_of_ventilation_causes_condensation_build_up

Condensation occurs when warm air collides with cold surfaces, such as walls and windows. Warm air contains a great amount of moisture, which condenses and forms water droplets, when in contact with cold surfaces. These emerging water droplets can cause damp surfaces and consequently damp problems in houses.

Before the days of double glazing, wall and loft insulation this humid, stale air would find its escape route through ill-fitting windows and doors, lofts and so on. It would be replaced by fresher, colder air or to you and me - a draught.


Three Important Factors That Cause Condensation:

  1. The level of moisture in the air.
  2. The temperature of the air in your home.
  3. The surface temperature of the windows.

The more moisture in the air the more likely it is that you will get condensation.


Today, after the introduction of energy saving measures such as draught proofing, double glazing and cavity wall insulation there is no natural escape route for this stale, humid air, which is now trapped inside the home.

As a result, this trapped and stale air only makes the problem worse, causing condensation on windows, walls and poor indoor air quality.


Causes of Condensation

Improperly fitted washing machine - From just one load of washing two litres of water is emitted into the air. 

A flued gas heater - which has a flue or chimney to carry the combustion pollutants and water vapour to the air outside the home. An unflued gas heater has no flue and releases the combustion pollutants and water vapour directly into the room. Burning gas always produces water vapour. If there is not enough fresh air circulating in the room, water vapour can cause high humidity and wet surfaces.

Kitchens and Bathrooms - produce a lot of steam and moisture so always ensure you have extractor fans on, use pan lids when cooking, put bath mats down and keep doors closed. 

All of these factors cause high levels of humidity, meaning there is too much moisture in the air and so creates condensation.  


EnviroVent has a ventilation system for every kind of home, whether it be the smallest apartment, bungalow, house or a major building project. With a wide range of energy efficient and innovative ventilation systems, you can be assured that your indoor air quality will be dramatically improved, whilst having a positive effect on your health and your home.

Arrange a Survey

We have local experts across the UK who can offer free advice and recommend the right products for your property.

Request a Brochure

Want to find out more about our products and service? Request a free brochure and we'll send one out in the post to you.

Find a Local Expert

We have local ventilation specialists throughout the United Kingdom who are able to help you with your problems.