Using UV Light in Mould Cleaning: Does It Work?

Using UV Light in Mould Cleaning: Does It Work?

Key Takeaways

  • Germicidal Properties: UV light, particularly UVC, is effective in killing mould spores by damaging their DNA, which stops reproduction and leads to cell death.
  • Applications in Mould Control: UVC light is versatile and can be used in HVAC systems to treat circulating air, as well as directly on surfaces to disinfect and prevent mould growth in moisture-prone areas.
  • Safety Considerations: Using UV light requires caution as exposure can be harmful to skin and eyes, underscoring the importance of following strict safety guidelines during use.
  • Integration with Other Remediation Methods: For best results, UV light should be used in combination with other mould control strategies like humidity control and adequate ventilation.
  • Cost-Effectiveness: Although the initial setup cost for UV systems may be high, the long-term benefits of reduced maintenance needs and prevention of mould recurrence can make it a cost-effective mould remediation solution.


The article explores the effectiveness of UVC light in combating mould by detailing its germicidal properties that disrupt mould DNA, leading to cell death. It discusses the applications of UVC in HVAC systems and on surfaces, emphasises safety precautions, and suggests integrating UVC with other mould remediation methods. While initial costs are high, UVC is a cost-effective and long-term mould cleaning solution due to its low maintenance needs and effective prevention of mould recurrence.

Mould Cleaning

In the ongoing battle against mould in homes and businesses, ultraviolet (UV) light emerges as a compelling tool, promising effective disinfection and mould cleaning solutions. This article explores the efficacy of UV light in mould remediation, detailing the science behind it, its application, and key considerations for its use.

The Science Behind UV Light and Mould Control

UV light, specifically in the UVC spectrum (100-280 nm), is renowned for its germicidal properties. UVC light works by penetrating the cells of microorganisms, damaging their DNA or RNA, and rendering them incapable of reproduction and survival. This technology has been effectively utilised in various settings, including healthcare and food industries, for disinfection and sterilisation purposes.

Effectiveness of UV Light in Mould Remediation

Mould spores, which can be detrimental to health and difficult to eradicate, are susceptible to UV light. The application of UVC light in mould-infested areas disrupts the DNA of mould cells, ultimately leading to their death. Studies have demonstrated that UVC light can effectively reduce the fungal load on surfaces and in the air, making it a valuable tool for mould control.

Applications of UV Light in Combating Mould

  1. HVAC Systems: Installing UVC lights in HVAC systems can prevent the proliferation of mould by treating the air as it circulates. This method not only controls mould but also improves indoor air quality by reducing airborne pathogens.
  2. Surface Disinfection: Portable or fixed UVC light units can be used to disinfect walls, ceilings, and other surfaces where mould growth is a concern. This application is particularly useful in damp environments where mould thrives.
  3. Preventative Measures: In settings prone to moisture, such as bathrooms and kitchens, UVC lighting can serve as a preventative tool, continuously controlling the ambient levels of mould spores and thus preventing growth.

Key Considerations When Using UV Light for Mould Control

  • Safety: Exposure to UVC light can be harmful to skin and eyes. It is crucial to use UVC devices in accordance with safety guidelines to avoid direct exposure.
  • Material Compatibility: UVC light can degrade certain materials over time, such as plastics and rubber. It’s important to consider the compatibility of materials in the area where UVC light will be used.
  • Integration with Other Methods: While UVC light is effective, it is most beneficial when used in conjunction with other mould remediation techniques, such as humidity control and proper ventilation, to address all aspects of mould growth.
  • Professional Installation and Maintenance: Professional installation and regular maintenance are recommended to maximise the effectiveness and safety of UVC light systems.

Cost-Effectiveness of UV Light in Mould Remediation

The initial setup cost for UVC light systems can be higher than conventional mould cleaning methods. However, the long-term savings are significant due to its low maintenance needs and the prevention of mould recurrence, making it a cost-effective solution for many.

Mould cleaning

UV light is a powerful tool in the fight against mould, offering a chemical-free, low-maintenance solution to keep environments healthy and mould-free. Whether used in residential settings, healthcare facilities, or commercial buildings, UVC light provides a robust defence against mould, ensuring safer, cleaner indoor environments.

By embracing this innovative technology, property owners can significantly enhance their mould management strategies, contributing to overall wellness and property integrity.


What is the best method for mould cleaning in homes?

The most effective mould cleaning method varies by the severity of the mould issue. For small-scale mould, a mixture of detergent and water can be used to clean the affected surfaces. For more extensive mould problems, professional mould cleaning services are recommended to ensure thorough remediation using specialised techniques and equipment.

Can I perform mould cleaning myself, or should I hire a professional?

For minor mould issues, DIY mould cleaning can be done using household cleaners. However, if the mould covers an area larger than 10 square feet, or if it involves potentially hazardous situations like sewage contamination, it is advisable to hire professional mould cleaning services. Professionals have the appropriate tools and protective gear to safely handle the removal.

How can I prevent the need for future mould cleaning?

Preventing mould and the need for future mould cleaning involves controlling moisture and humidity in your home. Utilise dehumidifiers and air conditioners to keep humidity levels low, promptly repair any plumbing leaks, ensure adequate ventilation, especially in areas like bathrooms and kitchens, and consider using mould-resistant products in areas prone to moisture.

Why Choose Us?

AllAces Cleaning & Restoration has over 35 years of industry experience handling extensive mould cleaning and remediation projects across Brisbane, Sydney, Melbourne and surrounds. Our IICRC-certified technicians are highly trained and experienced utilising the latest technology and equipment to ensure the return of a pre-loss condition.

Trust the experts and contact the team at 1800 00 10 10 today!

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