“After months of peeling plaster and damp odours, Peter Cox’s team resolved our issue swiftly. Their rising damp treatment restored our walls to perfect condition, and the friendly surveyor explained every step clearly. We couldn’t be happier with the results or the professional approach of our local rising damp specialist.”
— Sarah Johnson, Homeowner, Leeds
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Rising Damp Specialists
If you’ve noticed dampness rising up your walls, your property may require rising damp treatment. Rising damp is caused by moisture travelling up through brickwork or masonry. It is particularly prevalent in older buildings where original damp proof courses may have deteriorated or be entirely absent.
Often confused with other types of damp, a damp and timber survey is used to accurately diagnose and confirm whether the issue is rising damp.
At Peter Cox, our expert team understands the distress and damage that damp can cause to your home. With over 70 years’ experience, we’re the go‑to specialists for reliable diagnosis and lasting repair. Find out how our proven methods can protect your property and restore your peace of mind.
What is Rising Damp?
Rising damp occurs when moisture from the ground rises through porous materials such as brick, stone or plaster by capillary action. This is the same way fragrance in a reed diffuser rises up a wick. Masonry contains tiny tubes which draws up groundwater, which contains salts that damage internal surfaces.
A missing, bridged or damaged damp proof course (DPC) allows this groundwater to seep upwards, leading to visible signs like tidemarks and deteriorated plaster.Salts may be deposited in the wall which can result in decorations and plasterwork breaking down. Around the affected area you may notice damp plasterwork and timber, such as floorboards, joists and skirting boards. These materials will absorb moisture and could lead to wet rot or dry rot in the timber.
If left unaddressed the problem could accelerate heat loss and compromise structural integrity, making rising damp prevention essential. While often mistaken for other issues, this type of damp is always found on ground floor walls.
At Peter Cox, our specialists draw on over 70 years of expertise to deliver comprehensive rising damp solutions tailored to your property’s needs. We begin with a detailed survey to identify the source and extent of the problem, then recommend the most effective treatment, typically through chemical injections. Trust our team to diagnose accurately and implement proven rising damp solutions for a dry, healthy home.
Our Rising Damp Treatment Service
A damp survey is used to accurately diagnose and confirm whether the issue is rising damp. If a surveyor finds evidence of penetrating damp or a condensation problem, they will recommend different remedial treatments.
If confirmed to be rising damp, our rising damp treatments are tailed to safeguard your home and offer long lasting solutions.
The Rising Damp Treatment Process
When treating rising damp, our process ensures a thorough and lasting solution:
- Survey and assessment: A qualified property care surveyor will conduct a detailed damp survey to determine moisture levels, salt content and the DPC condition.
- A detailed report: You will receive a report detailing the findings. If a rising damp problem is found, the surveyor will provide you with evidence from the survey. The report will contain recommendations for remedial work, where necessary, and details of how to book in the work at a time suitable for you.
- Preparation works: The removal of skirting boards, radiators and any salt‑contaminated plaster will be required to expose affected areas.
- Drilling injection holes: Drilled at 120 mm intervals into mortar joints approximately 150 mm above ground level.
- Chemical injection: Application of a silane‑based damp proofing cream that penetrates mortar and brickwork to form an impermeable barrier.
- Drying and monitoring: While it's ideal to leave walls exposed to dry out fully, in practice, this is not always possible, and they are often replastered sooner. We use breathable plaster that allows residual moisture to escape, supporting the ongoing drying process.
- Replastering and finishing: Breathable, salt-resistant plaster is applied to protect the treated wall and support the drying process. Final decorative finishes can then be added to restore the wall’s appearance.
Our certified technicians adhere to BS6576:2005+A1:2012 standards, providing peace of mind and a robust defence against moisture ingress.
Causes of Rising Damp
Most buildings have a form of barrier installed just above ground level to prevent ground water rising up, known as a damp proof course (DPC). However some buildings in the past were built without DPCs. DPCs can be made of different materials such as slate, bitumen or membrane, depending on when it was built. Over time these may fail and allow groundwater to move upward through masonry through capillary action. This is when damp proofing is required.
Sometimes a property may have a functioning DPC, but it has been bridged. A bridged DPC means that groundwater is able to bypass the barrier, and can move upwards.
Contributing factors of rising damp include:
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Wet ground conditions: - High water tables or poor drainage.
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Building materials: - Some forms of masonry are more susceptible to rising damp than others, depending on the size of the capillaries.
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Bridged DPCs externally: - Raised flowerbeds, driveways or external renders can bypass the DPC
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Bridged DPCs internally: - Plaster brought down to the bottom of a wall may overlap the DPC internally
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Abutting Structures: - New build masonry structures or abutting garden walls may bridge existing DPCs
Even properties with a sound damp proof course can suffer if it becomes compromised, so understanding the causes is key to effective rising damp prevention.
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Above: evidence of a bridged damp proof course caused by raised ground level being raised above the DPC
Signs of Rising Damp
Signs of rising damp are typically confined to ground floor walls and can be subtle initially.
Common indicators include tidemarks, salt deposits and timber decay. Below are key symptoms to look out for:
- Tidemark damp stains: Dark bands above skirting boards.
- White salt deposits: Residual salts left on plaster surfaces.
- Decaying skirting boards and floorboards: Timber may feel spongy or crumbly.
- Damp wallpaper, paint and plaster: Peeling or bubbling finishes.
- Damp or musty smells
Early detection by spotting the signs of rising damp will allow us to recommend tailored rising damp proofing and prevent further damage.
Rising damp treatments will only work if the problem has been correctly diagnosed. This makes it important to get a professional survey from a trained professional who will be able to thoroughly assess the problem and confirm the type of damp.
Tide mark damp stains
The most common sign of rising damp on an inside wall is a “tide-mark” or damp stain, which often feels damp to the touch. This mark may extend above the skirting board to a height of one metre or more. The height is dependent on the amount of water present and the rate of evaporation. If water soluble salts are drawn up from the ground, these cannot evaporate off and are held in the plaster, often as a coloured line. They may also be 'hygroscopic', which means they can pull moisture from the air into the wall.
White marks left by residual salts
Water that rises from the ground by capillary action often contains hygroscopic salts and other contaminants that make their way from the brickwork and into internal plaster. As the water evaporates the salt fragments are left behind, leaving a residue and creating coloured salt deposits. This is also the case with Gypsum plasters that have been 'float' finished. As the dry, white Gypsum sulphate migrates to the surface. This can usually be brushed off or wiped with a damp cloth.
Decaying skirting boards and floorboards
Decaying skirting, floorboards and other ground floor timber can be a sign that rising damp has been left untreated for a while. This is because prolonged exposure to excess moisture in the wall can cause the germination of fungal spores that give rise to wet or dry rot infections. Any timber that is spongy, easily crumbles when touched or has visible fungus growing on it requires immediate attention.
Damp wallpaper, paint and plaster
Damp and peeling wallpaper can also be a sign of rising damp. If there is excess moisture in the walls this will transfer to the wallpaper and it will start to peel away from the wall. Excess moisture in the wall due to rising damp will also cause flaky/bubbling paint or deteriorated plaster. You will often find deposits of plaster and paint on the floor where it has crumbled.
What does Rising Damp look like Outside?
Outside rising damp usually appears with a damp tidemark pattern that can rise to around a metre above the ground. It is common to see salt efflorescence and crumbling mortar and you may also notice green or brown algae growth near the base where moisture lingers.
Why Book a Professional Rising Damp Survey?
If you are worried about a damp problem in your property, Peter Cox can provide a professional damp and timber survey to identify any issues and provide you with recommendations where necessary.
A damp and timber survey is used to check the health of your property and identify any problems that could affect it, both externally and internally.
Identifying rising damp early can save you time, money and stress. A professional rising damp survey uses moisture meters, thermal imaging and salt analysis to pinpoint the exact cause and extent of the issue. Amateur attempts to diagnose damp can lead to misdiagnosis.
“Early detection and removal of rising damp is vital to prevent structural decay and to protect your property,” says Steven Jameson at Peter Cox “Our expert team ensures accurate diagnosis and lasting results.”
Why Choose Peter Cox for Rising Damp Treatment?
We are rated ‘Excellent’ with over 2,500 independent customer reviews on Trustpilot and are a member of Which? Trusted Trader.
With over 70 years of experience in protecting properties across the UK Peter Cox is a trusted name for damp and timber surveys and specialist treatments.
Our nationwide network of qualified rising damp specialists follows British Standard 6576:2005+A1:2012, and our treatments are typically backed by long term guarantees and optional rising damp insurance.
Rising Dampness FAQs
Have questions about rising dampness and its impact on your property? Our FAQs cover everything from myths and health concerns to rising dampness treatment, energy efficiency and costs. Read on to get expert answers and guidance tailored to your needs.
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Is rising damp a myth?
No, rising damp is a well‑documented phenomenon, observed since Roman times. Misdiagnosis can fuel scepticism, but moisture meters and accredited surveyors confirm its presence reliably. Trust our experts to distinguish genuine rising damp from other issues and recommend the correct solution for your home. Choosing a qualified rising damp specialist ensures an accurate survey and lasting repair.
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What’s the difference between rising damp and other types of damp?
Rising damp differs from other damp issues by its vertical movement of groundwater. In contrast:
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Penetrating damp: Horizontal moisture ingress through driving rain, damaged external walls or leaks.
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Condensation damp: Moisture from indoor air collects on cold surfaces, often in corners and poorly ventilated rooms.
Our professional surveys use moisture mapping to identify the specific cause, ensuring you receive the proper remedy for your property’s damp problem.
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Does rising damp smell?
Rising damp can create a musty, damp odour in affected areas, but it does not produce a unique scent distinct from other damp types. If you detect persistent, ground‑level mustiness combined with visual signs, it may indicate rising damp rather than simply condensation. A professional rising damp survey can confirm the cause and prevent misdiagnosis.
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Is rising damp a problem?
If left untreated, rising damp can damage walls, ruin decorative finishes and compromise structural integrity. You’ll see tidemarks and salt deposits, and timber elements like skirting boards may develop wet rot or dry rot. Moist walls also increase heat loss, raising energy costs and creating an unhealthy environment. Prompt treatment by specialists prevents further deterioration and restores your home to a safe, comfortable state.
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Can rising damp affect my health?
Prolonged exposure to rising damp can foster mould growth, releasing spores that exacerbate respiratory issues such as asthma and allergies. Damp, cold walls can also contribute to poor indoor air quality, potentially triggering chest infections or asthma flare‑ups. By tackling rising damp early, you protect not only your property but the health and wellbeing of everyone in your household.
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When is rising damp treatment needed?
You should consider rising damp treatment as soon as you notice persistent moisture stains, salt deposits or timber decay on ground‑floor walls. Early intervention helps to prevent further damage to plaster, paint and structural timbers. Our experts recommend a professional rising damp survey at the first sign of damp to diagnose the cause accurately and advise on the most effective remedy for your home.
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Can rising damp affect my energy bill?
Damp walls lose heat more quickly, making your heating system work harder and increasing energy bills. By treating rising damp, you improve thermal efficiency and reduce heat loss through walls. A proper damp proof course protects your property and helps you save on energy costs over time.
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How much does rising damp treatment cost?
Estimating rising damp treatment costs without a professional rising damp survey is difficult, as prices vary according to factors like the extent of moisture damage, wall construction and access requirements. After your survey, we’ll provide a detailed, no‑obligation quote tailored to your property, outlining each recommended treatment stage and the associated costs so you will know exactly what to expect before any work begins.
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How long does rising damp treatment take?
The duration of rising damp treatment varies with the severity and whether remedial work is required. Chemical injections typically require one day for drilling and injection, followed by a 6–12 week drying period. Physical barrier installations may take 2–3 days, including preparation and finishing. Our surveyor will provide a clear timeline so you know exactly what to expect and when your home will be fully restored.
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Can I deal with rising damp myself?
While minor damp issues can sometimes be managed with improved ventilation and basic sealants, rising damp often requires specialist equipment and expertise. DIY injections risk incorrect application, leading to ineffective barriers or further damage. Our technicians are trained in BS6576:2005+A1:2012 standards and use precise moisture mapping to ensure complete treatment. For guaranteed results and long‑term protection, it’s best to rely on qualified professionals rather than tackling rising damp alone.
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Is rising damp covered by insurance?
Unfortunately, the majority of buildings and contents insurance policies consider rising damp to be the result of gradual deterioration and therefore will not cover you for damage caused by rising damp.
However, Peter Cox does offer rising damp insurance if this extra peace of mind is something you would be interested in for your home or commercial property. -
Is rising damp treatment guaranteed?
For a typical treatment for rising damp, you can be assured that it will carry the benefits of our twenty year guarantee. This provides the security and peace of mind that comes from knowing that should something go wrong with our damp proofing treatment, then we will be there to put it right.
On top of our guarantees and optional rising damp insurance, we go the extra mile to make sure our customers feel secure knowing that we are a rising damp treatment company that you can absolutely trust. We are a Which? Trusted Trader and rated ‘Excellent’ on Trustpilot with over 2,500 reviews. As leaders in the damp protection and property care industry, we set the standards for excellence for professionalism and expertise in the industry.
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Should you buy a property with rising damp?
It is okay to buy a property suffering with rising damp, but it would be advisable to first carry out a damp and timber survey to fully understand the extent and the potential costs involved in treating the problem.
This can then be used to negotiate with the seller, and if the work is backed by a long term guarantee you know your new property is protected long term. If the repair costs are higher than expected or the seller is unwilling to negotiate, you can always walk away from the purchase.
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Is it illegal to sell a house with rising damp?
You are legally required to disclose any known problems when selling a house including rising damp. This is to allow for transparency and avoid potential legal problems. Often damp and timber problems are hidden and may not have been noticed by the seller. This is why it is so important to carry out a thorough inspection from a trained professional when purchasing a property.
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Can you dry out rising damp?
Yes it is possible to dry out rising damp, but it may take a long time and you must address the underlying cause of the moisture ingress - by installing a damp proof course. The drying out period will depend on the type of construction material, temperature and humidity. Any hygroscopic salts brought up into the masonry from the groundwater will remain and could draw moisture from the atmosphere.
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Can rising damp ever be fixed?
Yes, once a qualified professional has identified the root cause to be rising damp, specialist damp proofing will prevent the problem from returning. The installation of a new damp proof course and salt retardant plastering is an effective way of returning your property to its former glory, and often comes with a long term guarantee for peace of mind.
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What is the best treatment for rising damp?
The best treatment for preventing the upward movement of groundwater in walls is the installation of a damp proof course (DPC). These are normally installed when a property is being built, but some buildings may not have them. A remedial DPC can be installed using a chemical damp proofing cream that creates a waterproof barrier, preventing the upward movement of moisture.
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What are the first signs of rising damp?
The first signs of a damp problem are often damp patches and tide marks visible on internal walls. It can cause wallpaper and paint to peel off the wall and skirting boards beginning to decay. You may even notice a musty smell around the affected area. Over time you may notice white powdery salty deposits known as efflorescence which can also be an indicator of a rising damp problem.
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What is a DPM in construction?
DPM stands for Damp Proof Membrane. It is a waterproof material that is often used when building a property to prevent moisture from rising upwards, in the form of a damp proof course.
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Is rising damp a structural problem?
Yes, rising damp can be a serious structural problem for buildings. The groundwater that rises up through walls can damage brickwork and mortar over time, especially during winter when the moisture freezes and causes spalling. The moisture at the bottom of the wall can cause fungal decay in structural timber like joists and beam ends. Over time this timber may lose its structural integrity.
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How to treat damp walls internally?
To effectively treat damp walls it's important to correctly diagnose the type of damp causing the problem. The treatment for condensation differs from rising damp, which differs from penetrating damp, so if you misdiagnose you might not solve the problem. Treatments might involve fixing leaks, installing a damp proof course or improving ventilation.
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How long does rising damp treatment last?
Remedial damp proofing when done correctly can last decades. A good quality surveyor will be able to correctly identify a damp problem and provide you with a report for remedial work that is often backed by long term guarantees of up to 20 years, but often it will last much longer. Peter Cox have been installing remedial damp proof courses for decades since its founding in 1951.
Next Steps
Our damp services
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