Condensation & Black Mould

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condensation mould


The most common type of dampness in any property is condensation. This is generally caused by warm moist air condensing on cold surfaces. Condensation can be worse in homes with poor ventilation as well as in any home with poor or intermittent heating – allowing damp air in the property to condense. Spotting the signs of condensation quickly – being visible through the appearance of water droplets on walls or windows and possibly even black mould on surfaces – will assist in taking the first steps to deal with the problem and effectively treat it.

This is probably the most complicated of dampness to diagnose and can sometimes hide between the layers of the property called interstitial condensation. If this is not sorted it will result in timber decay. The most common form of condensation is the one we see on are windows normally in the morning and evening, and can leave a tide mark on your window ledges. Also, we can find black mould in our property. This can be harmful if not treated as the spours will become air borne and we then breathe them in. This can lead to lung problems if not sorted. Many people use bleach to wash black mould off – this does not work as it is a living organism and has roots in the masonry.   If we don’t sort this out black mould will spread and grow on our clothes and furnishings. If this happens we will need to throw these things out!

We can offer a wide range of products to suit most properties in the form of passive vents, fungi check paints to forced air systems to name but a few!

If condensation is not sorted it will course long term structural damage to your property and will result in a bill far bigger than the one you would have if you dealt with it when you first notice it. If you have a rented property it is the landlord’s responsibility to ensure your home is fit for purpose. You can help youself by opening windows as much as possible and venting the property as much as you can especially in the kitchen and bathrooms as these areas produce the most moisture

Condensation in buildings is a major damp problem that affects many domestic properties. Quite simply condensation is water that is deposited on surfaces from warm, moist air that comes into contact with cold surfaces. 

Condensation is generally perceived to be a winter problem. Cold air enters a building, the air is warmed for comfort, the warm air takes up and holds moisture, the warm moist air comes into contact with cold surfaces and condensation occurs when excess water is released. 

Very often the first indication of condensation is black spot mould growth in the most affected areas. It can also be seen as misting of windows leading to water droplets and even puddles of water on horizontal surfaces such as window sills. Other areas typically affected are cold external walls or pipework, and where there is poor air circulation, behind items of furniture, in built-in cupboards or in corners of rooms for example. 

Economic restraints and lifestyle issues will often play a significant part in condensation problems. 

Condensation can be addressed by ensuring an adequate balance is achieved between heating, ventilation and insulation. However, more often than not other control measures are required to deal with condensation. 

D&S supply a range of products to assist in condensation control. These products vary from Dentolite Sterilising Solution and Mould Control Packs for treating black spot mould, and Fungi-chek Emulsion Paints, to Passive Vapour Vents, Humidity Tracking Extract Fans and Positive Input Ventilation units for both houses and flats.


Condensation is one of the most common causes of dampness in properties. Quite simply condensation is water that is released from moisture laden air and deposited on cold surfaces, and is usually seen as a problem during the colder winter months. 

Examples of condensation is seeing your breath in cold weather and when mirrors or a cold tap steam up in a bathroom.

In your house condensation is often seen on windows being more noticeable on cold mornings, and possibly on external walls. Condensation is also found where air movement is restricted, such as in corners of rooms, behind items of furniture placed against walls and even in wardrobes or cupboards. Its presence can be first indicated by the development of black spot mould growth on walls and ceilings, and even furniture, clothes and other fabrics. Condensation could also lead to wood rot of affected timbers including suspended floors. 

Appropriate measures need to be taken to control condensation which can be achieved by ensuring an adequate balance between heating, ventilation and insulation. However, more often than not other additional control steps are required. 

We offer up to a 30 year guarantee for this type of works


Black mould is not a sign of a dirty home or work place it just means you have a bad CONDENSATION problem. Most of our jobs are in the rental market as we find these to be the least maintained properties. Also properties that have had cavity wall insulation put in as this does not let the house breath. Some people will try and wash the mould off with a shop brought black mould remover or bleach -this may work, but only if you then you sort out the reason for the mould in the first place.

If you don’t, IT WILL COME BACK. D&S Remedials offer a free no obligation report. This will give you a breakdown of the problem and what works will need to be done to cure this problem.

Please see below the health implications of what BLACK MOULD does to us:

Health Effects

Moulds are ubiquitous in nature, and mould spores are a common component of household and work dust.

However, when spores are present in large quantities, they are a health hazard to humans and pets.


  • Nasal and sinus congestion, runny nose
  • Eye irritation, such as itchy, red, watery eyes
  • Respiratory problems, such as wheezing and difficulty breathing, chest tightness
  • Cough
  • Throat irritation
  • Sneezing/ Sneezing fits
  • Asthma


At D&S we have many things we can use to get read of black mould and condensation, from Passive vents, forced air systems fungi check paints and a whole list of Chemicals to kill of the mould. We only use the best produces on the market and so far we think that is from Sovereign Chemicals.

This means we can help you at a price that suit’s you .