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How to Reduce Condensation and Mould in Your Home

As a homeowner, there are several maintenance tasks that you need to keep in mind to avoid future problems. One of them is dealing with black mould growth. Not only is it unsightly, but it can also pose risks to you and your family’s health. If you’re experiencing black mould formation around your windows, it’s vital to address the issue immediately. In this article, we’ll provide you with some expert advice from Property Clinic on whether your windows need to be replaced or if there are alternative solutions available to tackle the problem.


Condensation and mould growth are frequent problems in many homes across the country, especially during colder months. In one instance, a young family who recently moved into their first house noticed that their windows accumulated a large amount of condensation after cold nights. They are hoping to avoid the expensive cost of new windows. In another scenario within a south-facing sunroom, lower corners below the window sill are constantly damp, with black mould forming and damaging the walls. Using a dehumidifier is only providing temporary relief, and the homeowner wants to know how to resolve the problem and eliminate the mould.

Moist air can cause condensation and mould growth, which can travel from warmer areas of the home to colder ones. Moisture generated from activities like cooking and taking showers should be collected at the source and expelled outside with the assistance of extractor fans. Adequate ventilation is essential to allow for a cross-flow of air throughout every room, and all rooms should be provided with heat. However, poorly fitted insulation or inadequate ventilation provisions in external/internal building elements (i.e. walls, floors, and roofs) can also cause mould growth and condensation.

It is difficult to diagnose the cause of the condensation and mould in the sunroom without a physical inspection. Still, the homeowner should consider simple, low-cost steps to reduce the risk of condensation and mould before investing in more significant construction solutions. Ensuring all moisture is expelled outside, avoiding drying clothes in the home, venting tumble dryers outside of the house, and keeping wall vents in each room open are a few ways to prevent condensation. Regularly opening windows and providing room heating, especially during cooler months, can also reduce the risks.

While these measures may not solve the condensation and mould growth problems entirely, they can help reduce the risks. The homeowner should monitor the issue for any improvement while also considering building construction details in their property. It is crucial to clean affected areas using an anti-fungal wash before renewing finishes to remove mould growth. In severe cases, professional advice is necessary to avoid further damage.

Andrew O’Gorman is a chartered building surveyor and member of the Society of Chartered Surveyors Ireland. For more information, readers can email [email protected]. Note that the Property Clinic is for general information only and not intended as advice on which readers should rely. It is recommended to obtain professional or specialist advice before taking any action or refrain from it on the basis of the content. The Irish Times and its contributors will not be responsible for any loss or damage resulting from reliance on the content.

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