How to Fix Damp and Keep Your Home Dry

After the heavy rains we’ve experienced recently, many South African homeowners are noticing signs of damp in their homes. Damp can cause serious structural damage and even pose health risks if left untreated. 

Whether you’re dealing with peeling paint, a musty smell, or visible mold, it’s essential to address damp issues as soon as possible. In this guide, we’ll cover the different types of damp, how to spot the signs, and most importantly, how to fix damp in your home.

Types of Damp and Their Causes

Understanding the type of damp you’re dealing with is crucial to finding the right solution. There are three main types:

1. Rising Damp

• Caused by water from the ground moving up through walls due to capillary action.
• Common in older homes with poor or damaged damp-proof courses.
• Signs include tide marks, peeling paint, and damp patches at the base of walls.

2. Penetrating Damp

• Happens when water seeps through external walls, roofs, or windows due to leaks or poor drainage.
• Often caused by blocked gutters, cracked walls, or defective roofing.
• Signs include damp patches that grow larger after rain and localized mold growth.

3. Condensation Damp

• Occurs due to excess moisture inside the home from cooking, bathing, or drying laundry indoors.
• Common in poorly ventilated homes.
• Signs include misty windows, black mold on walls and ceilings, and a musty smell.

How to Spot Damp in Your Home

It’s important to check for damp regularly, especially after heavy rains. Here are some key signs:

• Mold and mildew: Black or greenish spots on walls, ceilings, or furniture.
• Peeling or bubbling paint: Especially near skirting boards or on ceilings.
• Damp patches: Particularly on exterior-facing walls or ceilings.
• Musty smell: A persistent damp odor, especially in rooms with poor airflow.
• Crumbling plaster: Indicates long-term moisture damage.

How to Fix Damp in Your Home

The method for fixing damp depends on the type and severity of the issue. Here’s how to address each type:

Fixing Rising Damp

• Check your damp-proof course (DPC): If your home doesn’t have one, or it’s damaged, you may need to install or repair it.
• Apply a damp-proof injection: A chemical treatment that creates a barrier to stop moisture from rising.
• Remove and replace affected plaster: If plaster has been damaged, it needs to be removed and replaced with a moisture-resistant alternative.
• Improve drainage: Ensure the ground outside your home slopes away from the foundation to prevent water accumulation.

Read our blog to find out what waterproofing costs in South Africa are

Fixing Penetrating Damp

• Inspect and repair external walls: Look for cracks, missing bricks, or damaged render and repair as needed.
• Fix roof leaks: Check your roof for broken tiles, damaged flashing, or blocked gutters and make necessary repairs.
• Unblock and clean gutters: Make sure rainwater drains away properly instead of overflowing onto walls.
• Seal windows and doors: Use weatherproof sealant to prevent rain from seeping through gaps.

Fixing Condensation Damp

• Improve ventilation: Open windows daily, especially in kitchens and bathrooms, to allow moisture to escape.
• Use extractor fans: If you don’t have them, consider installing fans in areas prone to high humidity.
• Use a dehumidifier: Helps reduce indoor moisture levels in damp-prone areas.
• Avoid drying clothes indoors: If possible, dry laundry outside or use a tumble dryer with an external vent.

Preventing Future Damp Problems

Once you’ve fixed damp issues in your home, it’s essential to take preventive measures to avoid recurrence:

• Regular maintenance: Inspect your roof, gutters, and walls periodically for damage and leaks.
• Keep your home well-ventilated: Allow fresh air to circulate to prevent moisture buildup.
• Monitor indoor humidity: Keep an eye on condensation levels and address them before mold develops.
• Apply water-resistant paint: Especially in high-risk areas like bathrooms and kitchens.

When to Call a Professional

While some damp issues can be handled with DIY solutions, others require professional intervention. If you’re dealing with severe damp, structural damage, or persistent mold growth, it’s best to consult an expert. Professional damp specialists can diagnose the exact cause and recommend long-term solutions tailored to your home’s specific needs.

Read our blog to find out the cost of damp proofing per square meter

Damp in the home is not just an aesthetic issue, it can cause serious damage and even health risks if ignored. By understanding the type of damp affecting your home and using the right solutions, you can protect your property and keep your living space healthy and comfortable.