Posted on
June 22nd, 2016

How to Diagnose Damp

Whether you are a building surveyor, landlord or homeowner, you will probably have come across damp at some point or other. Identifying the type and severity of the damp is absolutely essential if you want to ensure that you treat it effectively. But how can you tell which one is present?

Here are some useful tips for diagnosing damp:

Rising Damp

FEMA Warns Against Mold IssuesRising damp occurs when groundwater travels up through the building, often due to having inadequate damp proofing. This is extremely common in old buildings where the damp proofing can become damaged over time, or the ground level has been altered. Signs of rising damp include tide marks on walls above skirting boards, peeling wallpaper and salt residue stains. If you think that this could be the cause of your problems, you will need to look at fixing the damp proofing with a specialist kit, membrane or paint.


Condensation controlCondensation is undoubtedly the most common cause of damp and is found in millions of homes throughout the UK each year. If you notice moisture droplets or wet patches, in particular on windows, you are probably experiencing condensation. The best way to deal with this is to introduce better methods of ventilation. This could be opening windows and doors when cooking or showering, avoiding drying clothes indoors and using extractor fans where possible. It’s important not to ignore this problem as it could lead to mould growth which is potentially life threatening to anyone who comes into contact with it.

Penetrating Damp

Baseline 8 Membrane KitAs the name suggests, this type of damp is caused by moisture penetrating through the walls. Rather than travelling vertically up the walls like rising damp, the water will move horizontally and can even spread across ceilings. Structural defects with the building, such as leaky pipes or gutters, are often the cause of this household problem. If you notice damp patches that worsen when it rains, it is due to penetrating damp. Treatment will include fixing the cause of the leaks and possibly installing a damp proof membrane to prevent damp and staining.

Dampkits have a wide range of products available to help you treat any kind of damp. If you would like further information or have any questions, please call 0845 400 6666 or email

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