Is Rising Damp Dangerous? Health & Structural Risks Explained
Rising damp is more than a cosmetic problem. Here's what it does to your health, your walls and your resale value — and how quickly to act.
Short answer: yes, but slowly. Rising damp on its own won't collapse your wall next week, but the mould, salt damage and air-quality problems it causes are genuine health and financial risks. Here's what to worry about — and what not to.
Health risks
- Airborne mould spores triggering asthma, sinusitis and allergies — especially in children.
- Persistent musty smell that clothing and soft furnishings absorb.
- Elevated humidity encouraging dust mites (a major allergen in SA homes).
Structural risks
- Salt crystallisation cracks brick and blows plaster off in sheets.
- Skirting boards, wooden floors and door frames rot from the bottom up.
- Electrical sockets at skirting height corrode and become fire hazards.
Financial risk
Damp knocks 5–15% off resale price and must be declared on the mandatory property disclosure form — see our selling with damp guide for the full breakdown.
How urgently to act
Visible tide-mark only, no mould: fix within 6 months. Any visible mould or health symptoms: fix immediately. The DIY route is a weekend with our Xtreme kit, or we do it for you in a day with a guarantee via our professional service.
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