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  • Writer's pictureMitchell Fotheringham

Condensation in Buildings and how it affects you

Updated: Apr 3, 2023


Condensation in a bathroom caused by a lack of ventilation and promoted mushroom growth


Condensation is a phenomenon that occurs when water vapour in the air is cooled to the point where it turns back into a liquid this is known as the Dew Point. This can happen when warm, humid air comes into contact with a cooler surface, such as a window or a wall. As the air cools, it loses its ability to hold moisture, and the excess water droplets form on the surface.


Relative humidity (RH) is a measure of the amount of moisture in the air relative to the maximum amount it could hold at a given temperature. When the RH is high, there is a greater amount of water vapour in the air, which can increase the likelihood of condensation occurring. See our explanation of Relative Humidity Here

Condensation can be a significant issue for buildings, as it can lead to problems with dampness, mould growth and in extreme cases mushroom growth. In particular, poorly insulated buildings or with inadequate ventilation can be prone to condensation, as they may have significant temperature differences between the interior and exterior surfaces.

One of the most common areas for condensation to occur is on windows. This is because windows are often the coldest surface in a room, particularly in winter when the temperature outside is lower. When warm, moist air comes into contact with a cold window, the moisture in the air can condense on the surface, leading to water droplets forming.

If left unchecked, condensation can lead to a range of problems. The excess moisture can cause mold and mildew to grow, which can be a health hazard for building occupants. It can also lead to structural damage, particularly in wooden building elements such as floor joists where moisture can cause the wood to rot.


To prevent condensation from becoming an issue, it is essential to control the relative humidity levels within the building. This can be done through a range of measures, including improving ventilation to allow moist air to escape and ensuring that the building is properly insulated to reduce temperature differences.


Condensation is a common problem that can have serious consequences for buildings if left unchecked. By understanding the relationship between relative humidity and condensation and taking steps to control moisture levels within the building, it is possible to prevent dampness and mould growth and ensure the long-term integrity of the structure.


If you have moisture issues in your building, please don’t hesitate to contact us at 01412379491 or drop us an email info@hisurv.co.uk. We look forward to helping you.

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