Penetrating Damp


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Penetrating Damp Yorkshire

Penetrating damp can be destructive and invasive, and affects homes throughout Yorkshire. It describes the way moisture penetrates a wall from the surrounding area, using ‘capillary action’ to soak through the material. When you spot penetrating damp, it’s vital you seek expert advice to keep your home in a good state of repair and those inside feeling comfortable.

Penetrating damp is particularly an issue within cellars and basements as the walls are surrounded by earth, meaning they are in constant contact with moisture. However, this is not the only place penetrating damp can occur. There are different reasons for penetrating damp depending on the location: broken or missing roof tiles, bust pipes in the attic of your property can cause damp spots to appear on your ceiling; damp appearing on your walls can be due to exterior plaster or brickwork issues.

penetrating damp in Selby

Rising Damp affects a wall in Leeds, Yorkshire

penetrating damp

Rising damp affects a damp wall in Wakefield

Effects of Penetrating Damp

There are several symptoms of penetrating damp to look out for and they can take a while to appear, so it’s important to take action whenever you notice anything. Some symptoms are: localised dampness, plaster damage, wet rot decay, dry rot decay, mould, moss and brick damage.

Penetrating damp contributes to the humidity in a property, something which can affect the health of your family in time. Damp in the air creates a perfect environment for mould to grow, which can cause respiratory health issues. This is particularly risky to the elderly, children, and people who suffer from asthma. Inhaling mould caused by dampness can inflame the airways, causing nasal congestion, wheezing, chest tightness, coughing and throat irritation. Prolonged exposure to dampness can reduce your lung function and lead to long-term problems. In your house, damp creates the perfect environment for the growth of dry rot – a wood destroying fungus that can seriously damage the structure of your property, making it unsafe to live in.

Treating Penetrating Damp

When treating penetrating damp, it is important to get to the root of the problem to fix the issue. This typically includes repairing cracks or aging issues to the house and removing deteriorated plaster. Allerton Damp Proofing offer several services to treat penetrating damp…


StormDry is a masonry protection cream that is applied to the exterior of a property to repel rainwater and add to the insulation value of brickwork. StormDry is a product we consider when addressing issues with penetrating damp, providing walls which are exposed to the elements with an extra layer of protecting insulation.

Damp Proofing Membrane

Damp proofing membranes are a hardened material designed to provide a lasting, impenetrable barrier to stop water from damaging the wall. These sheets are installed behind plasterboard to provide a sealed barrier to stop water ingress. This is commonly used in cellars and basements.

If you’re looking to protect your basement from damp to turn it into a livable space, we offer full basement conversion services.

Chemical Damp Proof Course

Chemical damp proof courses are a fast and reliable way of inserting a new course into a property that has not previously had one, or one where the existing damp course is no longer effective.

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Speak to a member of the team now on 0330 111 3377 or press the button below to book your survey

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Our accreditations

Below, you’ll find the logos of the organisations with which we are accredited.  Click on them to find out more information.

The logo of the Property Care Association PCA

The logo of CHAS

The logo of Constructionline, a UK Giovernment Certification Scheme

Trustmark logo, a UK Government Scheme

For more information on penetrating damp and the possible solutions, contact Allerton Damp Proofing. One of our surveyors will be happy to help you and diagnose the problem.  


“How can I tell whether I have penetrating damp?”

ANSWER: There are various ways you might be able to spot penetrating damp. The first sign is often ‘wavey’ or damaged wallpaper, or crumbling plaster. You might also see wet or dry rot, mould or brick damage. If you suspect penetrating damp (or any form of damp) then call in the experts immediately. We can send out a qualified surveyor to diagnose the problem and provide an accurate quote to get it sorted.

“Is penetrating damp dangerous?”

ANSWER: Penetrating damp in itself isn’t dangerous. However, in the long run, it does pose a lot of associated risks. For example, penetrating damp can lead to mould. In turn, black mould spores can impact the health of occupants, causing asthma and other respiratory problems that last beyond being exposed to the mould. Penetrating damp can also lead to problems with the building’s structural integrity. It means it’s extremely important to get in touch with an expert when you spot the first signs of penetrating damp.

Please note that, as a provider of essential services, we are still open for business, with some restrictions. As a new or existing customer, you can continue to call us to discuss new or existing projects.

Please note that we have had to restrict our work in occupied homes considerably, due to the risk that this might pose to our customers and workforce. However, our work in empty homes and properties continues largely as normal.

If you would like to speak to a member of our team about anything to do with our work during the COVID-19 crisis, please contact us, as normal, using any of the contact details on this site.