Damp issues in homes are not only horrible to look at but, in the long run, can also lead to structural damage and health concerns if left unaddressed.
Two of the main types of damp are rising damp and penetrating damp. While they may appear similar, understanding their differences is important for effective treatment and prevention.
What is rising damp?
Rising damp is a phenomenon where moisture from the ground travels upward through the porous materials of a building’s walls, such as bricks and mortar. This upward movement, known as capillary action, occurs when there is no effective damp-proof course (DPC) or when the existing DPC has failed. The moisture carries salts from the ground, which can accumulate on the walls, leading to visible damage and deterioration.
Mould and mildew growth
These can harm air quality and trigger health issues, especially respiratory problems.
Damage to walls and plaster
Damp can lead to bubbling paint, peeling wallpaper, and deterioration of wall materials.
Structural weakening
Persistent moisture can weaken a building’s structure, which may lead to costly repairs in the long run.
Rising damp signs
Identifying rising damp early can help stop extensive damage. Common signs include tide marks or staining on walls, usually up to a meter above the skirting board. You may notice peeling paint or wallpaper, a musty smell in affected areas, and salt deposits on the wall surface. These indicators suggest that moisture is being drawn up from the ground, affecting the internal finishes of your home.
How to treat rising damp
Dealing with rising damp involves several steps. Firstly, identify and fix the source of moisture, which may involve improving drainage or lowering external ground levels. Secondly, install a new damp-proof course. Chemical DPCs are commonly used, where a damp-proofing cream is injected into the wall to form a barrier against moisture. Finally, repair internal finishes. Once the moisture source is addressed, affected plaster and decorations should be removed and replaced to restore the appearance and integrity of the walls.
What is penetrating damp?
Penetrating damp, also known as lateral damp, occurs when water infiltrates a building through external defects. Unlike rising damp, which moves upward from the ground, penetrating damp travels horizontally through walls, ceilings, or roofs. Common entry points include damaged brickwork, faulty guttering, and leaking roofs. This type of damp can affect any level of a building and is often worsened by wind-driven rain.
Penetrating damp symptoms
Signs of penetrating damp include damp patches on walls or ceilings, often accompanied by a musty smell. You may observe discolouration, peeling paint or wallpaper, and in severe cases, mould growth. Externally, you might notice damaged brickwork or mortar, and water stains on walls. These symptoms typically worsen during periods of heavy rain and are localised to specific areas where water ingress occurs.
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Causes of penetrating damp
Penetrating damp is primarily caused by defects in a building’s exterior. Common issues include cracked or porous brickwork, deteriorated mortar joints, faulty or blocked guttering, and damaged roof coverings. Poorly sealed windows and doors can also allow water to enter. Regular maintenance is crucial to prevent these problems, as even minor defects can lead to significant damp issues over time.
Penetrating damp treatment
Treating penetrating damp involves identifying and repairing the source of water ingress. This may include repointing brickwork, sealing cracks, repairing or replacing damaged guttering, and making sure roofs are watertight.
Applying water-repellent treatments to external walls can provide additional protection. It’s essential to address the underlying issues rather than just treating the symptoms, as failure to do so can result in recurring damp problems.
Rising damp vs. penetrating damp
There is an ongoing debate about the frequency of rising damp, with some experts suggesting it’s often misdiagnosed. However, when properly identified, rising damp is a genuine issue that requires appropriate treatment. Misdiagnosis can lead to unnecessary or ineffective interventions, so it’s important to consult with professionals who can accurately assess and address the problem.
Rising damp myth
There is an ongoing debate about the frequency of rising damp, with some experts suggesting it’s often misdiagnosed. However, when properly identified, rising damp is a genuine issue that requires appropriate treatment. Misdiagnosis can lead to unnecessary or ineffective interventions, so it’s important to consult with professionals who can accurately assess and address the problem.
Rising damp specialists
Getting a rising damp specialist allows you to have a thorough assessment and effective treatment plan. These professionals can conduct detailed surveys, identify the extent of the problem, and recommend suitable treatments. Their expertise is particularly valuable in older properties, where traditional construction methods may complicate diagnosis and treatment.
Penetrating damp specialists in Poole
For residents in Poole experiencing penetrating damp, local specialists at DampHQ can provide tailored treatments to sort your problem quickly. These professionals are familiar with the specific challenges posed by the town’s climate and building styles. They can offer full services, from identifying the source of damp to implementing effective repairs and preventative measures. Call us on: 01202 144530
How to treat rising damp in an old house
Treating rising damp in older homes requires careful selection of the building’s materials and construction methods. Traditional properties often use breathable materials, so introducing modern, impermeable treatments can make damp issues worse. Specialists can recommend appropriate interventions that respect the building’s integrity, such as installing a suitable DPC and using compatible materials for repairs.
Rising damp solutions
Effective treatments for rising damp include installing a new DPC, improving drainage around the property, and using breathable materials for internal finishes. Regular maintenance.
Knowing the differences between rising damp and penetrating damp will help you to find the help you need and put an end to the issue. Both problems can have significant impacts on your property’s structure and your health if not dealt with properly. Regular inspections and maintenance can go a long way in keeping your home dry and healthy. If you’re unsure about the presence or type of damp in your property, it’s always best to consult with specialists. For professional advice and services, feel free to contact us.
FAQs
How can I tell if it’s rising damp or penetrating damp?
Rising damp typically presents as damp patches starting from the ground level and moving upwards, often accompanied by tide marks and salt deposits. Penetrating damp, on the other hand, can occur at any level and is usually the result of water ingress through external defects like faulty guttering or cracks in the walls.
Can penetrating damp spread from a neighbouring property?
Yes, especially in terraced or semi-detached houses. If your neighbour has damp issues that are not addressed, moisture can seep through shared walls, leading to problems in your property as well. It’s advisable to discuss any concerns with your neighbour and consider a joint inspection if necessary.
Is black mould always a sign of damp?
Not necessarily. While black mould often indicates excess moisture, it can result from condensation rather than structural damp issues. However, persistent mould growth should be investigated to determine the underlying cause.
What’s the best way to treat rising damp in an old house?
Treating rising damp in older properties requires careful consideration. It’s essential to use breathable materials and methods that are sympathetic to the building’s original construction.
How can I prevent penetrating damp?
Regular maintenance is key. Make sure that your property’s exterior is in good condition – check for cracks, maintain gutters and downpipes, and make sure you have proper drainage. Applying a water-repellent treatment to external walls can also help prevent moisture ingress.
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https://www.damphq.co.uk/why-condensation-happens-and-how-to-control-it-indoors/
