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February 26, 2024

Moisture In The Home

by Geoff Flavell in Damp Proofing Blogs

Moisture In Your Home Explained

Dewpoint and relative humidity are important factors in maintaining a comfortable and healthy indoor environment. Here’s a post explaining these concepts:
Understanding Dewpoint and Relative Humidity Indoors: The Impact of Daily Activities
In our homes, activities like bathing and cooking significantly influence the indoor atmosphere, particularly concerning humidity and dewpoint. Understanding these concepts is essential for creating a comfortable living space and preventing issues like mould growth and structural damage.

What is Dewpoint?

Dewpoint refers to the temperature at which air becomes completely saturated with moisture. At this point, the air can no longer hold water vapour, leading to condensation.

Relative Humidity Explained

Relative humidity is the amount of moisture in the air compared to what the air can hold at a particular temperature. It’s expressed as a percentage. The higher the percentage, the more moisture the air contains.

How Bathing and Cooking Affect Indoor Humidity

Everyday activities like showering and cooking release moisture into the air, increasing the indoor humidity levels. This rise in humidity can significantly affect the dewpoint.

The Link Between High Humidity, Dewpoint, and Condensation

When the humidity in a room increases, the dewpoint also rises. If the dewpoint reaches the temperature of colder surfaces in the room (like windows or walls), condensation occurs. This is because the air around these cold surfaces cools down to its dewpoint and releases moisture.

Dangers of High Indoor Humidity

Persistent high humidity can lead to problems, including:
1. Condensation: Excess moisture condenses on colder surfaces, creating an ideal environment for mould and mildew.
2. Mould Growth: Mould thrives in moist environments, posing health risks and damaging your home.
3. Structural Damage: Continuous condensation can deteriorate building materials.
The Importance of Ventilation and Extraction
Proper ventilation is essential to manage indoor humidity. This can be achieved through:
1. Extraction Fans: Installing fans in high-humidity areas like bathrooms and kitchens helps remove moist air outside.
2. Regular Ventilation: Opening windows or using ventilation systems promotes air circulation, reducing moisture levels.


Maintaining a balance between dewpoint and relative humidity indoors is essential. While daily activities like cooking and bathing contribute to higher humidity, effective ventilation and moisture extraction strategies can help prevent condensation and mould growth, ensuring a healthier living environment.


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Contact Preservit Ltd today to learn more about moisture in your home and how we can help you. Your health and comfort are our top priorities.

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