Managing moisture in the attic is an increasingly common challenge as we add insulation and make our houses more energy efficient. Older houses are particularly vulnerable as they often lack a vapour barrier in the ceiling, allowing moisture to migrate upwards and remain in the attic.
Moisture in the attic is not only a structural concern - it can also have consequences for your indoor environment. Damp air creates the conditions for mould, rot and bad odour in the attic, which in some cases can spread into the home. It is therefore important to identify the causes and take the right measures in time.
With the introduction of more energy-efficient solutions such as heat pumps and district heating, combined with additional insulation and triple glazing, houses have become warmer but also more prone to moisture accumulation.
Older heat sources, such as oil and pellet boilers, helped create a natural air circulation that reduced the risk of condensation. In modern houses, warm, moist indoor air can instead rise into a cold attic - where it condenses on cold surfaces.
The temperature difference between the interior of the dwelling and the attic, especially when combined with insulation and the lack of a vapour barrier, means that the risk of moisture damage is higher than before.
Retrofitting or energy efficiency improvements require careful attention, especially with regard to the climate in the attic. In winter, hoarfrost on roof trusses can be a clear sign that moisture levels are too high. If problems are not addressed in time, black mould and microbial growth establish themselves - which is harmful to the building and significantly worsens the indoor climate.
In desiccant dehumidifier are an effective and proven solution for keeping attics dry, whatever the season. Unlike condensation dehumidifiers, desiccant dehumidifiers also work in cold spaces, making them particularly suitable for attics. The illustration at the beginning of this article shows an example of how to install a desiccant dehumidifier in a cold attic.
For best results, the attic should be sealed and checked regularly, especially after major changes to the heating or insulation of the house. Combining proper dehumidification with good control (for example, via a control panel that is clearly visible in the home) reduces the risk of future damage and maintains a healthy indoor climate.
Different attics have different conditions - everything from insulation and ventilation to temperature variations, air leakage and building design affects which dehumidifier is best suited.
💡 With our digital tools you can easily find the right dehumidifier. You can also contact our technical sales representatives if you want personalised advice.
