Mould growth in flats and houses and prevention

Quality of living in autumn and winter:

The cooler seasons bring special challenges for property owners and tenants, especially in popular regions of Austria that are known for their humid climate and the associated challenges. Autumn and winter may be the cosy seasons, but they often put us to the test in terms of living quality and maintenance - the issue of mould growth in particular comes to the fore.

Popular residential locations near the city: comfort and provision

Even in urban locations such as Vienna or Graz, autumn brings higher humidity and cold air masses, which increase the risk of condensation in flats and houses. Particularly in old buildings with less good thermal insulation, the temperature difference between the interior and exterior walls quickly causes condensation, which can lead to mould growth. Such cities, where old and new buildings stand close together, benefit particularly from modernised insulation elements and ventilation concepts.

Mould growth in autumn and winter: Causes and prevention

Mould is not only a visual problem, but also a serious health risk, especially for people with respiratory diseases, allergies or a weak immune system. In autumn and winter, the risk of mould growth increases considerably because windows are opened less often and the cold air increases humidity indoors. This penetrates into poorly insulated wall areas and creates an ideal environment for mould spores.

Causes of mould growth:

• Condensation on cold walls: When warm, humid indoor air meets cold exterior walls, condensation forms, which settles on surfaces and encourages mould.
• Insufficient ventilation: Especially in winter, less ventilation is used to save heating energy. As a result, the room air becomes more humid and the moisture cannot escape.
• Insulation deficiencies: Old buildings or poorly insulated properties are particularly susceptible, as the cold walls absorb more moisture.
• Monitor air humidity: Humidity can be measured with a hygrometer. The optimum value is between 40 % and 60 %. If the humidity rises above this level, the room should be aired urgently.
• Correct furniture placement: Furniture should not be placed too close to external walls to ensure air circulation and prevent mould growth. A distance of 5-10 cm is ideal.

Prevention and practical tips:

• Regular airing: Open the windows wide for five to ten minutes at least two to three times a day to ensure a complete exchange of air. This so-called "shock ventilation" is particularly effective and saves heating costs.
• Maintain the correct room temperature: Maintain a minimum temperature of 18 °C in living rooms
• Monitor air humidity: Humidity can be measured with a hygrometer. The optimum value is between 40 % and 60 %. If the humidity rises above this level, the room should be aired urgently.
• Correct furniture placement: Furniture should not be placed too close to external walls to ensure air circulation and prevent mould growth. A distance of 5-10 cm is ideal.
• Wipe windows dry: In very humid homes, condensation often forms on the windows. This should be wiped off in the morning so that the moisture does not return to the room air.

Although autumn and winter pose special challenges, with the right measures to prevent mould and an adapted ventilation routine, property owners and tenants can experience the cold season without unwanted surprises.