Whether it appears as a gas, solid or liquid, moisture is usually an unwelcome guest in our homes or workplaces

Moisture damage

Moisture damage can cause serious harm to both building materials and the indoor environment. On this page, we explain how to identify moisture damage, where it typically occurs, why it happens and what you can do to prevent it.

A persistent musty smell is a common warning sign that moisture may be present

How to spot moisture damage

Signs of moisture damage can range from discoloured walls, ceilings and floors to swollen wooden surfaces and peeling wallpaper. A persistent musty smell is also a common warning sign that moisture may be present.

Using a hygrometer makes it possible to detect elevated moisture levels early, before the damage develops further. If there is any suspicion of mould, a mould test is recommended, as it can quickly confirm whether mould is present and whether action is required.

Where does moisture damage occur?

Moisture damage most often develops in specific areas of the home, each with its own risk factors.

Loft

Moisture damage in the loft often occurs when ventilation is insufficient, causing condensation on cold surfaces. Roof beams and insulation are particularly vulnerable. Leaking roof tiles can also allow water to seep in, which may lead to issues such as white mould in the loft.

Basement

Basements are especially prone to moisture damage due to their close contact with ground moisture and often limited ventilation. Water can penetrate through unsealed walls and floors, and high humidity levels can lead to mould growth and deterioration of building materials. Moisture in the basement is therefore one of the most common moisture-related issues in residential buildings.

Bathroom

Bathrooms are exposed to high moisture levels from showers and baths. Common problem areas include grout lines, tiles and floors. Without effective ventilation, moisture can quickly spread and create favourable conditions for mould growth.

Kitchen

In kitchens, moisture damage often occurs behind sinks and around dishwashers. Leaking pipes and steam from cooking can cause problems if ventilation is inadequate.

Utility room

Washing machines and tumble dryers generate large amounts of moisture. Poor ventilation can result in moisture damage to walls and floors. Regular cleaning and good airflow help reduce the risk.

In colder climates warm, moist air meets cold surfaces and forms condensation

Why does moisture damage occur?

Moisture damage usually develops as a result of both internal and external factors. One of the most common causes is poor ventilation, where humid air is unable to escape and instead accumulates indoors. This is particularly problematic in colder climates, where warm, moist air meets cold surfaces and forms condensation.

Leaks from pipes, roofs or installations are another frequent cause, as water can collect unnoticed over time. In addition, poorly functioning drainage systems around a property can lead to standing water and moisture penetration.

What you can do about moisture damage

Acting quickly is essential to limit the extent of moisture damage. The sooner the issue is addressed, the less severe the damage and the lower the repair costs.

Start by identifying and eliminating the source of moisture, such as repairing leaks or improving drainage around the building. Enhancing ventilation, especially in high-risk areas like bathrooms, kitchens and utility rooms, is also an effective preventive measure.

Using a dehumidifier can help keep moisture levels under control, and regular measurements make it easier to avoid too much moisture before it causes structural or health-related problems.

If moisture damage is not addressed in time, it can lead to serious consequences. Mould growth is common and may cause health issues such as allergic reactions and respiratory problems

What happens if moisture damage is ignored?

If moisture damage is not addressed in time, it can lead to serious consequences. Mould growth is common and may cause health issues such as allergic reactions and respiratory problems.

Moisture can also compromise the structural integrity of a building. Materials like wood may begin to rot, swell or crack, leading to extensive and costly repairs. Over time, unresolved moisture damage can significantly reduce the value of a property.

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