Black mould is more than an unsightly nuisance — it is a genuine health hazard. Mould spores circulate through the air in your home, and prolonged exposure is linked to serious respiratory conditions, allergies, and illness, particularly in children and the elderly.
The single biggest reason mould returns after cleaning is that the underlying moisture source was never addressed. Painting over mould, bleaching it, or wiping it away are temporary measures at best. Within weeks — sometimes days — it returns, often worse than before.
Bleach in particular is counterproductive on porous surfaces like plaster and plasterboard. The water content in the bleach is absorbed into the wall, feeding the very conditions that allow mould to grow.
The most common cause of black mould in Irish homes. Warm, moist air from cooking, bathing, and breathing contacts cold wall surfaces and condenses. Poor ventilation, inadequate heating, and insufficient insulation all make it worse. It is not a lifestyle problem — it is a building performance problem.
Rising damp and penetrating damp create persistently wet wall surfaces that become ideal breeding grounds for mould. In these cases, treating the mould alone without addressing the damp source will always fail.
Mould is not a cosmetic problem. It is a symptom of a moisture problem, and the moisture problem is what needs to be fixed.
Mould spreads. What starts as a patch in a corner can colonise an entire wall within months. The health risks to your family increase the longer it is left. Don't wait until it becomes a much larger and more expensive problem.