Damp, mould and condensation

Causes of damp and mould

Corner of room with mould on wall

Dampness can happen for different reasons. The most common causes are condensation, penetrating damp and rising damp.

Condensation

Condensation happens when warm, moist air comes into contact with colder surfaces such as windows and external walls. If moisture is not removed, mould can start to grow.

Mould grows on damp surfaces and is often a sign that excess moisture is building up in the home.

Condensation can be made worse by:

  • not enough fresh air
  • not keeping your home warm enough
  • too much moisture in the air
  • insulation that is missing or not working properly

Penetrating damp

Penetrating damp happens when water gets into your home through problems such as damaged roofs, blocked gutters, damaged render, leaking pipes or internal leaks.

Rising damp

Rising damp happens when moisture from the ground moves up through walls or floors. This is less common and is usually linked to problems with the damp-proof course.

How damp and mould can affect your health

Damp and mould can affect anyone, but some people may be more vulnerable, including:

  • babies and young children
  • older people
  • pregnant women
  • people with asthma or other respiratory conditions
  • people with weakened immune systems

Exposure to damp and mould may contribute to breathing difficulties, asthma symptoms, coughs, wheezing, skin irritation, allergic reactions, stress and anxiety.

If damp or mould is affecting your home, please report it to us as soon as possible so we can investigate and take action where needed.

Preventing damp and mould

There are steps you can take to reduce damp and mould in your home:

  • report damp, mould and repairs as soon as possible
  • report faulty extractor fans, windows that will not open or heating problems
  • keep your home ventilated
  • use extractor fans where provided
  • keep trickle vents open where possible
  • reduce moisture from cooking, bathing and drying clothes indoors
  • wipe away condensation as soon as possible
  • clean mould using a suitable anti-fungal product and follow the manufacturer's instructions
  • dry clean clothing affected by mould or mildew
  • shampoo carpets if necessary
  • consider using anti-mould paint when redecorating
  • use a mould-resistant paste if wallpapering
  • allow access for inspections and repairs when required

Report damp or mould

If you have damp or mould in your home, report it as soon as possible:

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