How to Identify Rising Damp Signs in Your Property

Rising damp occurs when moisture moves up through a property’s walls due to capillary action. This issue is prevalent in older homes, where the building materials are more porous and less protected. If left untreated, rising damp can cause significant damage to your home’s structure and lead to health risks which stem from mould growth.

In the UK, around 2% of homes were affected by rising damp in 2023, with private rented properties showing the highest rates (9%). Recognising signs of rising damp early can prevent costly repairs and preserve your home’s integrity. This guide will walk you through how to spot the signs, understand the causes, and take action to protect your property.

Key Signs of Rising Damp

Rising damp commonly shows up on the ground floor, as seen in this Bournemouth case study. This is because moisture can easily reach the foundation and lower walls of the property. The share of homes with damp in England has generally decreased from 10.6% in 2003 to 4.1% in 2022. However, recent years have seen a reversal of this trend, with rates rising again since 2019.

Here are the key signs to look for:

1. Tide Marks & Damp Patches: These stains show up on the lower part of walls, usually about 1.5 metres high. They happen when moisture evaporates, leaving mineral salts behind. This is the most noticeable and common sign.
2. Peeling Paint or Wallpaper: Dampness makes paint bubble and wallpaper peel. This often happens near the bottom of walls, where moisture builds up the most.
3. Salt Deposits: White, powdery stains form on the wall when moisture rises and evaporates, leaving behind mineral salts. This is a strong indicator of rising damp.

These signs should not be ignored. Acting quickly prevents further damage, saving time and money on costly repairs.

Why Rising Damp Happens in UK Homes

Rising damp doesn’t just happen randomly. Several factors contribute to this issue, and understanding them can help you act proactively.

In 2024, a government report estimated that 6.5 million UK homes (about 23%) could be affected by damp and mould, including rising damp.

Here’s why it happens:

• Many older homes, especially those built before the 20th century, often do not have a good Damp Proof Course (DPC). Over time, a DPC can deteriorate or become blocked, allowing moisture to rise through the walls.
• In properties with poor drainage or high groundwater, moisture builds up around the foundation. This increases the pressure on the DPC, allowing water to rise through the walls.
• Ground levels can sometimes be raised due to landscaping or building works, which can cause moisture to bypass the DPC. Raised patios, soil, or even internal plaster can lead to rising damp.

How to Prevent & Treat Rising Damp

Once you’ve identified the signs of rising damp, it’s essential to take immediate action. Properties without a proper damp-proof course (DPC) or with damaged DPCs are more likely to suffer from rising damp.

Here’s how you can prevent and treat rising damp effectively:

1. Install or Replace the DPC: The most effective solution for rising damp is to install or replace the DPC. A new, functioning DPC provides a protective barrier against moisture rising through the walls. If your home already has a DPC, it’s crucial to have it inspected and replaced if necessary.
2. Improve Your Drainage: Ensure your drainage systems, such as gutters, downpipes, and surface drainage, are in good shape. Proper drainage keeps moisture away from the foundation. This helps lower the risk of rising damp.
3. Replaster the Affected Areas: Once the DPC is addressed, you’ll need to replaster the affected walls. Apply a salt-inhibiting render. This stops moisture from getting in and protects the structure from long-term damage.

If you’re not sure your DPC is working or need help, schedule a damp survey to check your property.

Protect Your Property from Rising Damp

Rising damp is preventable, but early identification is crucial in avoiding costly repairs. By recognising the signs early, you can address the issue before it causes extensive damage. Common signs like tide marks, peeling wallpaper, and musty smells should not be ignored. The sooner you act, the more you can protect your property and save on repairs.

Rising damp is often caused by a failed damp-proof course (DPC), poor drainage, or high groundwater levels. Early intervention is key to preventing further damage and ensuring a safe, dry home. If you spot any of the signs of rising damp, don’t wait for the problem to escalate. Contact Croft Preservation today for a thorough inspection and reliable treatment solutions.

Call 01202 737739 or book your consultation and safeguard your property.