Condensation on walls in winter

How to Keep Condensation and Damp Out This Winter

Date Posted 7 December 2023

We all wish winter was just about cosy nights and warm cocoa. Unfortunately winter always brings along two unwanted guests to every home: dampness and condensation.

Understanding the differences between condensation on walls in winter and various forms of damp, and knowing how to manage them is crucial in ensuring the soundness and longevity of your home.

However, condensation and damp often point to more serious issues like rising damp and penetrating damp. Caused by water seeping through cracks and leaks, both these types can lead to structural damage and even respiratory problems, making it imperative to address them promptly.

In this article we’ll briefly go over what is condensation and damp, how to stop condensation on walls in winter, and what you can do to prevent damp walls in your home.

What Is Condensation and Damp?

What’s the difference between condensation and damp?

Condensation occurs when warm, moist air meets cold surfaces; this often leads to visible water droplets forming on those surfaces. Water droplets that form on the outside of your cold drinks on a hot day? That’s condensation.

Damp walls refers instead to the presence of excess moisture, typically within walls, floors, or ceilings. It is a broader term and includes various issues, including condensation, rising damp, and penetrating damp.

There are three key differences between these two that help homeowners decide how to manage the damage: location, cause and persistence.

First, location. Condensation typically forms on surfaces where warm indoor air meets cold surfaces like windows, while dampness can affect areas within walls, floors, and ceilings.

The second difference is cause. It’s sometimes uncomfortable for homeowners to keep windows open during winter. Activities such as cooking, bathing with warm water and heating, especially with poor ventilation, cause condensation in winter. Both penetrating and rising damp however originate from external factors. Rising damp occurs due to ground moisture, often caused by a lack of damp-proof course, and penetrating damp results from external factors such as damaged roofs, walls, or drainage systems.

Finally, condensation is often temporary happening during specific activities, while dampness tends to persist and worsen over time, causing major structural damage if left untreated.

How to Identify Condensation and Damp

While different in severity, both can lead to significant problems if left unaddressed. Here’s a quick guide on how to identify condensation and different types of damp.

You can quickly identify condensation with visible signs like water droplets on surfaces, steamed-up windows, and damp patches. Vigilance, especially during colder months, is crucial to catching condensation early and preventing further issues.

Identifying signs of damp walls in winter includes observing specific signs such as tidemarks, crumbling plaster, and musty smells for rising damp, and water stains, rotting wood, and damp patches below leak sources for penetrating damp.

Protecting Your Home

Condensation and dampness, though related to moisture, present unique challenges that require personalised management techniques.


How to stop condensation on your walls in winter?

The first thing you can do is improve ventilation within your home. This alone can drastically improve the effects of condensation. Natural ventilation, achieved through open windows and extractor fans in kitchens and bathrooms, allows the flow of fresh air, dissipating moisture-laden air. Mechanical ventilation systems, like whole-house ventilation units, ensure consistent airflow, minimising the risk of condensation.

What about those freezing winter days when you simply can’t open your windows?

Dehumidifiers are a great option in moisture-prone areas, when natural ventilation is limited or unavailable. They effectively remove excess moisture by extracting damp air and condensing it into water, which is then collected in a reservoir or drained away. Dehumidifiers are particularly valuable in basements, crawl spaces, and bathrooms, where moisture accumulation is common.

Another unsuspecting factor causing condensation in winter is indoor plants. Limiting them in susceptible areas also reduces additional moisture release, aiding in humidity control of your living spaces.

Most of all, proper insulation and sealing play a pivotal role in condensation management. Adequate insulation maintains uniform indoor temperatures, reducing the chances of condensation forming on cold surfaces. Insulating attics, walls, and floors minimises heat loss and condensation risks. Regular inspection by yourself or a professional, then sealing gaps and cracks in walls, windows, and doors can prevent drafts and entry points for cold, moist air, mitigating condensation.

Regular maintenance is essential in preventing condensation on your walls in winter. Ensuring heating systems operate efficiently maintains a warm and dry indoor environment. Regular inspections of roofing and insulation allow prompt repairs, preserving the building’s integrity against moisture ingress.


Unlike condensation, rising damp and penetrating damp are serious threats to a home’s structural integrity. Damp walls in winter are especially difficult because of the cold weather. This can often lead to significant damage and health concerns. Here are crucial steps and proactive steps homeowners can take to safeguard their homes:

Get damp-proofing measures installed. For rising damp, damp-proof courses or membranes in the walls easily prevent ground moisture from rising. These barriers act as shields, stopping moisture from infiltrating the walls and causing dampness.

Find and seal wall cracks and gaps. Your home’s exterior and interior walls can develop for cracks and gaps especially with age. Small openings can allow water to seep in, leading to both rising and penetrating damp. Seal these cracks promptly using appropriate sealants and prevent further water infiltration.

Roofs and external walls are primary entry points for water in the form of rain and dampness. Regularly inspect these areas for signs of wear and tear. Replace missing or damaged roof tiles as soon as you find them. Repair cracks in external walls, and regularly reseal joints where different building materials meet.

Does your property have proper drainage systems in place? Improper drainage can lead to water accumulating around the foundation, increasing the risk of rising damp. Effective landscaping practices can direct rainwater away from your house, preventing water from pooling and causing damp walls in winter.

When all else fails, consulting experts ensures accurate diagnosis and appropriate solutions tailored to the specific issue. They conduct thorough assessments, identify the source of dampness, and recommend appropriate treatments for your home. Depending on the severity, their recommendations may include chemical injections, waterproof renders, or tanking systems to create a robust barrier against moisture infiltration.

Taking proactive steps to protect your home is paramount. Whether it’s improving ventilation through natural or mechanical means, using dehumidifiers in moisture-prone areas, or investing in damp-proofing measures, removing unwanted moisture from your homes is vital.

At CS Damp Proofing, we understand the challenges posed by condensation and damp walls in winter. Don’t let condensation and dampness disrupt your peace of mind.

Contact us now to safeguard your home and family.