A dehumidifier dehumidifying wet walls

How to Dry Damp Walls?

Key Takeaways

Identify and Address Underlying Causes: Damp walls can result from issues like pipeline leaks, gutter damage, or external water seepage. Before drying, fix the underlying cause of damp problems to improve airflow and prevent further damp. Factors Affecting Drying: Drying time depends on factors like moisture level, surface type, temperature, humidity, airflow, and thickness of the affected area. Risks of Untreated Damp: Neglecting damp plaster can lead to mould growth, structural damage, staining, unpleasant odours, and increased energy bills.   The walls of a house get damp on them due to a variety of reasons. It can be either pipeline leakages, guttering damage, seeping of water from the outside, rising damp, or any other underlying cause. Once a wall gets a damp spot, it becomes wet. And it takes a lot of time and effort to treat this wetness. The wetter it is, the more time it will take to dry the wet walls out. The first thing in the process of drying damp walls is to contain the underlying cause of the damp issue. Once it's made sure that the cause of the damp has been fixed, no further damp will rise and we will be left with the damage and wetness that there is. Now, there are a variety of methods that allow the drying of damp walls, such as the use of dehumidifiers and heaters, increasing the ventilation in the same room or area that has damp walls, and much more. Therefore, damp walls can be dried up, but there needs to be a professional approach to it. Let's see how that works!   A dehumidifier dehumidifying the walls of a room

First – Make Sure the Real Cause Has Been Taken Care of

Before starting to fix affected walls, address any underlying concerns, such as faulty water pipes or gutters that are producing moisture. To precisely identify the cause of damp smell, hire a certified damp surveyor to do a thorough damp survey. The subsequent report will outline the specific activities required to resolve the damp condition. If there are leaky pipes, get a certified plumber. Be aware that if your home is linked to another, the leak might originate from leaking pipes on their properties. A professional checking the ventilation level  

If There's Excess Water, Drain it Away

In the case of significant water damage to your house, it is recommended to first determine the existence of standing water within the wall structure by drilling a small hole precisely 5 cm above ground level. If a standing water drain emerges during the preliminary drilling, it is advised that several holes be perforated in the wall at intervals ranging from 40-60 cm, allowing for the rapid drainage of any leftover standing water.   A professional cleaning fungus from a wet wall

Use Room Fans

It is recommended that a room can be used to dry up little moist areas. When dealing with small spaces, experimenting with a standing oscillating fan set to its maximum strength is advantageous. Place one or more fans strategically near the wet area to speed up the drying process for both the damaged surface and the ambient air moisture. If the used fan has an oscillation feature, use it to treat a variety of damp spots and places within its operating radius.  

Moisture Traps Can Be Useful

Use desiccants to effectively remove excess moisture from restricted places such as walk-in cabinets or closets. When it comes to desiccating these specific locations, absorbent materials outperform other solutions. Moisture traps, due to their intrinsic moisture-absorbing capabilities, efficiently isolate water molecules and may be easily removed for disposal. Indoor damp testing of a house  

Use Dehumidifiers

Although dehumidifiers do not entirely eliminate moisture, they serve an essential role in reducing ambient moisture levels. If you have significant wet spots on your walls that require the extraction of humidity from the surrounding warm air around, the intelligent use of a dehumidifier appears to be a reasonable and potentially practical course of action to consider.  

Open the Doors and the Windows

Use the strategic method of intentionally opening surrounding windows and doors to efficiently remove the prevalent, musty smell, odour and excess moisture. Improving the airflow dynamics within the space helps to speed up the complex process of desiccating the dampened walls, hence enhancing the overall environmental balance. Proper ventilation being setup in a house  

Heat Up the Room

In the event of water damage in a room with radiators, it is recommended to adjust the thermostat settings to raise the ambient temperature, therefore improving heat dispersion inside the enclosed space. This strategic change aims to speed up the desiccation process for the water-damaged walls.  

Ventilation Can Help

Proper and enough ventilation is critical in the thorough reduction of excess moisture within a damp-affected space, significantly contributing to the efficient drying process of the internal walls. It is critical to thoroughly inspect and handle any obstacles to the wall vents, such as the existence of wallpaper or ornamented photo frames because their removal is critical for optimizing and enhancing the overall airflow dynamics. The house owner opening the windows for better ventialtion in room  

Factors Affecting the Drying Process

Damp plaster drying time depends on several factors, including these common ones:

The Amount of Damp

The higher the moisture level in the plaster matrix, the longer it takes for the drying process to complete. Plaster with a semblance of wetness dries faster than plaster soaked with an abundance of moisture.

Type of Surface

Various plaster formulas have different drying velocities; for example, lime plaster dries more slowly than gypsum plaster.

The Temperature of Area

Elevated temperatures speed up the moisture removal process, whereas lower temperatures slow it. As a result, it is critical to ensure enough room ventilation during the drying period to reduce the possibility of condensation accumulation on the plaster substrate.

Humidity Levels

Humidity has a detectable effect on the drying rate, functioning as a decelerating force when high and an accelerating factor when low. Employing specialist equipment, such as a dehumidifier or strategically placed fans, becomes critical in order to actively reduce ambient humidity, hence accelerating the entire drying process.

Airflow of the Area

Optimizing air circulation improves the drying process's efficiency. It is recommended to maintain a continually well-ventilated atmosphere to increase air circulation within the space, and the strategic use of fans helps to augment the airflow, resulting in faster drying of moist plaster.

Thickness of the Affected Surface

Slender plaster applications are recommended to provide consistent drying and reduce the likelihood of unwanted consequences such as cracking or shrinking during the drying process. Wall getting dryed by a dehumidifier  

What if Damp is Left Untreated?

Neglecting damp plaster can bring various risks to your property and health. Some common dangers of untreated damp plaster include:

Growth of Mould

Moist air conditions promote the growth of black mould. In the absence of intervention to address untreated wet plaster, it becomes an ideal breeding ground for mould, resulting in health concerns such as allergic reactions, respiratory discomfort, and headaches.

Damage to Structures

Moisture leakage into the walls eventually weakens the structure of metal stud walls of the building. Damp plaster increases the breakdown of underlying wall components, increasing the danger of long-term structural difficulties.

Unwanted Staining

When moist plaster is exposed to humidity, it discolours and stains, reducing the visual attractiveness of the wall. The resolution of this problem proves to be a daunting process, requiring precise cleaning efforts or, alternatively, the application of fresh paint or plaster to restore the wall's visual integrity.

Musty Odours and Smell

Excessive moisture creates an ideal setting for the growth of bacteria and fungus, resulting in stinking conditions in the afflicted region.

Increased Energy Bills

Moisture infiltration within the walls reduces the efficacy of insulation, forcing heating systems to operate at higher intensities to maintain an optimal and comfortable ambient temperature, resulting in an increase in energy costs.  


There's a lot that goes into drying damp walls. The first thing you must do to dry out the wall is to make sure that the cause of the damp issue has been treated so that no more such damp problem comes up in the future and the process of drying is executed successfully. The next thing you should do is apply the required treatment options on the damp walls, such as damp-proofing solutions, increasing the ventilation in the rooms, using a heat source, and using a dehumidifier. Therefore, drying damp walls needs professional assistance, which can be provided by a damp treatment specialist. Also, during the process, keep in mind that there are various factors that will affect the speed and effectiveness of drying the damp walls such as the extent of damp issue, type of wall plaster, average temperature of the room, level of humidity, airflow, etc. So, be patient and do not rush.  

How do you dry a damp wall fast?

To dry a damp wall quickly, start by identifying and addressing the source of moisture, such as leaks or condensation. Improve ventilation in the affected area by opening windows and doors. Use fans or dehumidifiers to enhance air circulation and speed up the drying process. Wipe down the damp patch or surface with absorbent materials like towels or cloths to remove excess moisture. In severe cases, consider using a space heater to increase the temperature and expedite drying. Additionally, painting the wall with a moisture-resistant paint can help prevent future damp.

How do you dry out a damp cavity wall?

Drying out a damp cavity wall involves similar steps. Begin by locating and rectifying the cause of the moisture, which may include fixing leaks or improving a poor ventilation throughout. Ensure that the cavity has adequate airflow by installing ventilation openings. Utilize dehumidifiers or fans to enhance air circulation within the cavity. It's crucial to address both the interior and exterior aspects of the wall to prevent further damage from moisture ingress.

Will a heater dry out wet walls?

While a heater can help dry damp walls by increasing the ambient temperature and promoting evaporation, it may not be sufficient on its own, especially if the source of moisture persists a few weeks. Combining a heater with proper ventilation and dehumidification methods will yield more effective results. It's essential to identify and eliminate the root cause of the damp to prevent recurrence.

How do you remove moisture from walls?

To remove and absorb moisture from walls, start by identifying and fixing the source of the moisture, such as leaks or high humidity levels. Increase ventilation in the affected area by opening windows and doors. Use dehumidifiers to extract excess moisture from the air, and employ fans to enhance air circulation. Wipe down wet surfaces with absorbent materials to remove visible humidity. Additionally, consider applying moisture-resistant coatings or paints to affected areas to prevent future moisture absorption. Regular maintenance and addressing issues promptly will help maintain dry and healthy walls.

Table of Contents

Picture of Sam Fitzgerald – CSRT Damp Surveyor

Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

Testing device for measuring dampness in a house


At Damp Surveyors Ltd, we stand out as your premier choice for damp survey services in the UK. Our commitment to excellence and customer satisfaction sets us apart. Here’s why you should choose us:

  • Exclusive 3 Free Quotes: We offer a one-of-a-kind optional service where you not only get our top-notch damp survey but also receive 3 free quotes from vetted local companies, giving you peace of mind by saving you thousands on getting the most competitive quotes, and also time researching and contacting other reputable companies.
  • Knowledge and Experience: We provide unmatched knowledge to every survey we conduct thanks to our team of seasoned professionals and years of industry experience. This guarantees accurate assessments and practical solutions.
  • Nationwide Coverage: Whether you’re in a bustling city or a rural area, our services extend across the UK, making us accessible wherever your property is located. Choose us for nationwide reliability and excellence.

Choose Damp Surveyors Ltd as your reliable partner for all-inclusive survey needs. Our top concerns are the health and safety of your property, and we are committed to providing outcomes you can trust.

Damp and wetness seeping through the wall

How to Treat Penetrating Damp?

Key Takeaways Common Causes of Penetrating Damp: Leaking roofs, faulty gutters, cracked masonry, defective window seals, damaged flashings, porous building materials, external wall defects, landscaping issues. Signs Indicating Penetrating Damp:

Read More »
Damp proofing and insulation of a house

How Long Does Damp Proofing Last?

Key Takeaways Importance of Damp Proofing: Damp proofing is crucial for protecting buildings from issues like mould, structural failure, and wood degradation caused by moisture. Rising damp is a significant problem,

Read More »
bathroom dampness

How to Fix Dampness in Your Bathroom

Steamy showers and soothing baths are among life’s simplest pleasures, but they often leave your bathroom damp and uncomfortable. The main issue is inadequate ventilation, which fails to remove moisture,

Read More »

Our Services

Related Posts