How to Treat Dampness in Internal Walls Effectively 


Discover effective strategies in our guide ‘How to Treat Dampness in Internal Walls Effectively’, covering causes, prevention and solutions. 


Dampness in internal walls can be a persistent and damaging problem for homeowners and property managers. It not only jeopardises the building’s structural stability, but the growth of mould and mildew also presents health hazards. Effectively addressing dampness requires understanding its causes and putting suitable remediation measures in place. In this article, we will examine typical reasons for moisture in interior walls and talk about workable solutions.

Why preventing wall dampness is crucial

  1. Preservation of Structural Integrity: Over time, dampness can jeopardise the internal walls’ structural integrity. Water intrusion erodes construction materials like masonry, wood, and plaster, causing deterioration, crumbling, and even structural collapse. By keeping the building’s framework sturdy and stable, dampness prevention contributes to the long-term structural integrity of the structure.
  1. Preventing the Growth of Mould and Mildew: Moisture provides the perfect conditions for the growth of mould and mildew. Mould spores can worsen allergies and asthma, which can result in respiratory infections and other health concerns. By keeping walls from becoming wet, you can reduce the growth of mould and mildew and protect the health and safety of the occupants.
  1. Protection of Property Value: Untreated moisture can reduce a property’s market value and aesthetic appeal. Stained walls, flaking paint, and musty smells take away from the interior space’s overall appeal and could put off prospective tenants or buyers. By taking proactive maintenance and remediation measures to prevent wall dampness, you can maintain the property’s value and appeal in the real estate market.
  1. Improving Indoor Comfort: Moistness in interior walls can result in an uneasy indoor atmosphere with musty smells and clammy air. This may have a detrimental effect on the people’s comfort and health, which could result in unhappiness and a lower standard of living. By avoiding wall moisture and preserving ideal interior residents can live comfortably. 

Causes of wall dampness

Dampness in walls can arise from multiple sources, such as rising damp, penetrating damp, and condensation. When warm, humid air comes into contact with colder surfaces, water vapour condenses into liquid water. When moisture from the soil or groundwater is drawn upward through porous building materials by capillary action, rising damp occurs. When water seeps through exterior walls as a result of flaws or damage in the building envelope, such as gaps, cracks or improper waterproofing, the condition is known as penetrating damp. The precise cause of wall dampness must be determined in order to apply remediation techniques that work.

Identifying Types of dampness

Identifying condensation on walls

Condensation occurs when warm, moisture-laden air comes into contact with cooler surfaces, converting water vapour to liquid water. This condition is commonly seen on interior walls, especially in areas with poor ventilation or high humidity levels. Since condensation frequently appears as water droplets or beads forming on the surface, identifying it on walls is not too difficult. In extreme circumstances, condensation can result in visible damp patches or water pooling at the base of walls. Kitchens, bathrooms, and rooms with inadequate insulation are common places where condensation occurs. Furthermore, condensation can lead to the development of mould and mildew, which exacerbates moisture problems.

Identifying rising damp on walls

Rising damp is a condition that arises from the action of groundwater or soil moisture being drawn upward through porous building materials like concrete, mortar or brick. Internal walls may then become wet and damaged as a result of this moisture seeping through. These marks may be accompanied by crumbling or discolored plaster, as well as a musty odor. Older buildings with insufficient damp-proofing measures or structurally compromised buildings are more likely to experience rising damp.

Identifying penetrating damp on walls

Penetrating damp occurs when water penetrates external walls as a result of building envelope defects or damage, such as cracks, gaps or inadequate waterproofing. This could be caused by broken roof tiles, malfunctioning gutters or downspouts, fissured masonry, or inadequately sealed windows and doors. Tracing the source of water ingress is necessary to identify penetrating damp on walls, as this can be done by looking for visible water stains, damp patches, or localised dampness along the wall’s affected areas. 

How to prevent dampness in building

  1. Proper Drainage: Install sufficient drainage systems to direct rainwater away from the building, such as French drains, gutters and downspouts. To avoid blockages and clogs, give these systems routine maintenance and inspections.
  1. Effective Waterproofing: To prevent water infiltration, apply coatings or membranes to the outside surfaces of foundations, external walls, and roofs. For best results, make sure the installation is done correctly and use high-quality materials. Pay attention to weak spots like joints, corners, and apertures where water may enter.
  1. Appropriate Ventilation: To prevent moisture buildup indoors, make sure the building has enough ventilation throughout. To get rid of extra humidity, install exhaust fans in laundry rooms, bathrooms, and kitchens. To encourage ventilation in small spaces, use air bricks or trickle vents.
  1. Insulation and Thermal Bridging: Proper insulation prevents condensation by keeping indoor temperatures consistent and reducing thermal bridging, which can result in cold spots where moisture condenses. To reduce heat loss and condensation risk, insulate walls, floors, and roofs with the right materials and methods. Close off openings and crevices in the building envelope to stop drafts and air leaks.
  1. Routine Maintenance Checks: Establish an active programme of maintenance to find and fix possible sources of moisture before they become more serious problems. Regularly check downspouts, gutters and roofs for obstructions or damage. To stop water from entering, fix any gaps or cracks in external walls, windows, and doors right away. 

Treating dampness

  1. Increase Ventilation: Inadequate ventilation can cause moisture accumulation and condensation indoors. Installing exhaust fans in laundry rooms, bathrooms, and kitchens will improve airflow by removing humid air. In order to encourage cross-ventilation in enclosed areas, use air bricks or trickle vents. To maintain balanced airflow while minimising heat loss, think about upgrading to a whole-house ventilation system, such as mechanical ventilation with heat recovery (MVHR).
  1. Remove Mould and Mildew: These growths can aggravate health problems and are found in moist areas. Use a dedicated mould remover or a solution of detergent and water to thoroughly clean the impacted areas. To avoid coming into contact with mould spores, wear protective clothing, such as masks and gloves.
  1. Repair Damaged Surfaces: Restore any moisture-related damage, including rotting wood, peeling paint, and crumbling plaster. In order to avoid future moisture issues, replace or remove damaged materials as necessary, making sure to properly dry and seal the area. In locations that are prone to moisture, think about using moisture-resistant materials like cement board or plasterboard.
  1. Install Moisture Barriers: To stop groundwater from seeping into the building, install moisture barriers or damp-proof membranes in areas that are prone to rising damp, such as crawl spaces or basements. To prevent moisture infiltration, these barriers can be put in place below ground level or integrated into the foundation of the building.

Professional assistance 

Seeking professional help is critical when dealing with dampness in buildings, even if the problem appears to be minor. Professionals such as building surveyors, damp specialists, or moisture remediation contractors have the knowledge, experience, and tools to accurately diagnose the root cause of dampness and implement effective solutions. Their knowledge guarantees that moisture issues are dealt with completely, minimising potential harm to the building’s interior environment and structure and preventing recurrence. Professionals can also offer customised advice and recommendations based on the unique features of the building and the severity of the dampness problem, assisting property owners in making wise choices and avoiding costly errors.

Cost considerations 

When it comes to addressing dampness issues in buildings, cost is a major factor. Owners of real estate need to consider all of the costs involved in treating dampness, such as materials, labour, and expert advice. The total cost can be affected by variables like the severity of the dampness issue, the kind of remediation needed, and the underlying source of the dampness. In the long run, investing in high-quality materials and expert knowledge can save money by preventing costly repairs and recurring dampness issues. However, these investments may initially cost more but can result in more durable and effective solutions. Property owners should also take into account the possible cost of a delayed or insufficient dampness treatment, including a decline in property value, an increase in maintenance costs, and possible medical costs.


In order to preserve a building’s overall value, indoor air quality, and structural integrity, dampness in internal walls must be treated effectively. Property owners and managers can reduce the risks associated with moisture infiltration and stop additional damage by being aware of the different sources of dampness and putting the right remediation strategies into place. Successful dampness treatment requires a number of essential elements, including expert assistance, careful inspection, preventative maintenance, and cost considerations. Property owners can protect the long-term integrity and value of their investment while providing occupants with a safe, healthy, and comfortable living or working environment by promptly and thoroughly addressing dampness. 


How do you get moisture out of interior walls? 

To remove moisture from interior walls, improve ventilation, install dehumidifiers, and repair any sources of water ingress.

What is the permanent solution of a damp wall? 

The permanent solution for damp walls is to address the underlying cause, which may include repairing leaks, improving drainage, and implementing waterproofing measures.

What is the best way to treat damp walls internally? 

The best internal treatments for damp walls are to locate and remove the moisture source, fix any damage, and apply the necessary treatments, like waterproof coatings or moisture barriers.

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