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Condensation and Mould in dwellings: a major public health issue


Condensation and mould can be problematic for occupants of dwellings. Condensation occurs when warm, moist air meets a cold surface and cools, causing moisture in the air to condense into water droplets. This can lead to the growth of mould. Mould is a type of fungus that grows in damp or humid environments.

In buildings, mould can grow on a variety of surfaces, including walls, ceilings, and floors. Some common types of mould found in buildings include:


This type of mould is commonly found in damp or humid environments. Breathing in Apergillus spores usually isn’t harmful to a healthy being, but for people who have weakened immune systems, breathing in Aspergillus spores can cause an infection in the lungs, which can cause other underlining health issues.


It can grow both indoors and outdoors. Spores are airborne, which leads to spread.It is very common in areas of high humidity and moisture. Cladosporium can be found in serval areas of a dwelling eg. Windowsills and painted surfaces. Symptoms of an allergic reaction after exposure to Cladosporium include sneezing, nasal congestion, itchy eyes and throat and dry skin.


Is commonly found in damp or humid environments and can cause respiratory problems. Common places it can be found in an indoor environment are upholstery, walls, and carpets.

Stachybtrys chartarum (black mould)

This type of mould is commonly found in buildings that have water damage and can cause a variety of health problems. It is highly toxigenic.

Health impacts of mould

It is important to address mould growth as soon as it is discovered, as it can impact the health and well-being of occupants of a building. To prevent mould growth, it is important to keep indoor humidity levels low and promptly repair any water damage.

Proper ventilation is one of the keyways to prevent mould growth. It helps to control indoor humidity levels, which can prevent mould from multiplying. In addition to controlling humidity, proper ventilation also helps to remove mould spores and other airborne contaminants from the air.

Exposure to mould can cause a vast number of health problems, including allergic reactions asthma attacks and respiratory issues. People with compromised immune systems, may be more susceptible to infections from mould. In addition, mould exposure has been linked to some other health problems, such as fatigue, dizziness, and memory problems.

For example, the recent, well publicised death of Awaab Ishak in 2020. Awaab died, eight days after his second birthday, following ‘chronic exposure’ in Rochdale in the UK.“Awaab Ishak died as a result of a severe respiratory condition caused due to prolonged exposure to mould in his home environment,” the coroner stated. “Action to treat and prevent the mould was not taken. His respiratory condition led to respiratory arrest,” she said. (The Guardian, 2022)

If you are experiencing any of these symptoms and believe they may be related to mould exposure, it is important to speak to a healthcare provider.

How to reduce the risk of mould within your home:

  1. Keep the humidity level in your home low, ideally between 40-60%.
  2. Repair any leaks or plumbing issues to prevent water damage
  3. Keep your home clean and clutter-free, primarily in high humidity areas like the kitchen or bathroom
  4. DCV whole house system to create adequate airflow throughout the dwelling. Exhaust fans eg BXC2 to help remove moisture from wet areas
  5. Dry wet areas immediately, including spills
  6. Use mould resistant paint in areas that will likely be exposed to condensation eg. Bathroom/shower room
  7. Avoid drying clothes on clothes racks in unventilated areas

Aereco’s solutions

Aereco is an expert in this field and offers several ventilation systems to suit every need, thanks to the modulated ventilation. All our products work with intelligent technologies that combines IAQ and energy saving.

At Aereco, supply a complete range of high quality systems.



The Guardian – Death of two-year-old from mould in flat a ‘defining moment’, says coroner (Mark Brown and Robert Booth-Tue 15 Nov 2022) Link to article


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