Damp and Condensation Mould

The most effective way to keep a property free from condensation mould is to reduce the level of condensation as much as possible through heating and ventilating the home and to wiping down any residual condensation that does form on surfaces.

However, we are experiencing difficult times with a cost-of-living crisis that is affecting everyone and we know that some of our customers will be making decisions every day to heat or eat.

We know that it will not be possible for all our customers to operate the heating systems as much as they would like or be able to tumble dry clothes so they will be dried in the home on clothes driers instead. These are things that will make the home more likely to suffer from condensation and if left unchecked it will result in condensation mould.

However, you can still prevent the condensation mould from occurring and to help you do this we have put together some guidance leaflets, which can found at the bottom of this page.

What typically causes condensation and what does condensation mould look like?

1. Condensation happens when humid air meets a cold surface. 
2. When these water vapor modules reach a cold surface, they clump together.
3. 'Dew point' is when they form visible drops, and condensation forms on the surface.

The more moisture there is in the air the more likely it is you will get condensation. 

Condensation can lead to mould if left for too long.

Mould is a natural organic compound, and mould spores exist all around us in the air and are brought into our homes every time we open a door or window or on our clothes when we come in from outside. For mould to grow and spread it needs clean water (produced by condensation) and if it has a food source (dirt, dust and bacteria) it will grow and spread even quicker.

Take these two things away and the mould spores will not be able to grow.

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Above: Mould growing.

Below: Condensation on the glass running onto the sill.

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Above: The condensation needs to be removed/reduced daily in order to reduce the possibility of Mould forming.

This can happen in any home and is not purely a social housing issue. 

Other conditions that increase the risk of condensation 

• Inadequate ventilation - windows that don't open, broken or ineffective extraction fans.
• A lack of heating - not heating the house which may be a result of fuel poverty or a broken appliance
• Leaking pipework – the water will evaporate and add to the moisture in the air
• Defective insulation – poorly fitted loft insulation will leave cold spots on the ceilings
• Poor building design – bathrooms with 3 external walls will have greater heat losses and will need more ventilation
• Over filled rooms – restricts ventilation as air will not circulate around the items

Overcrowding – every person adds about 4 pints of water a day to the moisture level in the home. More people mean more moisture and more ventilation and management needed.

Dampness can enter the building through the foundation walls from the wet ground. Cracks on the surface of walls, slabs, terraces, roofs, etc., allow the entry of moisture during rainy weather seasons.

There are two main types of damp that we encounter.

Rising damp and penetrating damp, both of these can contribute to condensation mould. 

Rising damp

This type of damp is caused when water in the ground or a surface level rises through the structure of the property as a result of the failure, breach or lack of a moisture control barrier. 

These are namely the damp proof membrane, a solid floor or the damp proof course in a ground floor wall.

This is typically what you will see on the inside: rising damp coming up through the walls. 

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Rising damp coming through the floor will likely lift vinyl tiles and soft furnishings may suffer from mould. 

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Rising Damp - typically this is what you would see on the outside of the property: Damp brickwork above the damp proof course level which should be 150mm or 2 courses of brickwork above the external ground level.   

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Penetrating damp

Penetrating damp is caused when there are defects in the structure that allow water to pass through the fabric of the building. This can be a leak from a pipe internally or externally, a leaking roof, damaged brickwork or poorly sealed windows and doors. 

Typically, penetrating damp will look like this internally: penetrating damp on a chimney breast.

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Penetrating damp through a leaking roof. 

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This is what you would see on the outside that could cause penetrating damp: 

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 Blocked guttering overflowing roof:

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Cracked and damaged rendering:

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When you raise any damp and condensation mould concerns we will deal with your report in the following way:

Damp and condensation mould process 

Our Approach

We cannot cure condensation mould - we can help our customers to manage it and improve the quality of their home and wellbeing and ensure the home is free from damp.

Our Aims

• Act on each and every report – each report is logged and thoroughly investigated by a technically trained member of staff.
• Everything connected - the same, consistent advice being given out by call handlers, housing, technical surveying staff and tradespeople.
• Our Technical documents and staff training will reflect the same language.
• We will increase knowledge and awareness to enable colleagues to help customers with queries or concerns surrounding condensation mould.

We will use the data we collect to inform a Damp and Condensation Mould Strategy that seeks to put in place proactive interventions.

Please, DO NOT answer the door to cold callers -  all our teams and contractors will wear either branded clothing and produce ID if they are working for us or on our behalf.  Please always contact us if you have any concerns and remember we don’t ask for payment for any survey or fee for grant funded work.  

The quickest and easiest way to report damp and/or condensation mould is to contact our Customer Hub on 0333 200 7304.