Three Case Studies Showing How UVGI Can Be Used As An Adjuvant For Rental Property Mould Decontamination

Cameron Jones 1

Director, Biological Health Services, Toorak, VIC, Australia



Property managers are increasingly presented with claims of adverse health complaints from residential and commercial tenants especially following unexpected water ingress. There is a need for a rapid and cost effective OHS first-response while claims are verified. Ultraviolet germicidal irradiation (UVGI) is produced at a wavelength of 254nm within the UV-C bandwidth. Bacterial, yeast and fungal DNA deactivation is dose dependent and varies across Taxa. This poster reviews three case studies where UVGI was used in mould and water damage remediation in typical tenancy situations.


Ultraviolet germicidal irradiation used a pair of Phillips TUV 30-Watt tubes fitted on a mobile pushcart. HEPA units were Guardian R.


Three case studies are given:

1. Whole of room volume treatment where the resident considers porous personal property to be mould contaminated

2. Treatment of water damaged carpets that have not been replaced

3. Pre-treatment of room surfaces as part of ‘make-safe’ works before more extensive strip out or during strip out to minimise spore dispersal of viable cells

Viable plate counts showed significant decrease in viable moulds. Enhanced results are achieved with 24-hour UVGI cycling + HEPA.


UVGI is a photodynamic light-based method and is considered a green-sterilant at the correct distance and exposure level. It does not involve chemicals and is user-friendly for those with multiple chemical sensitivities or those who avoid hypochlorite or other liquid disinfectants. It is best used in combination with other decontamination methods like steam disinfection, HEPA air extraction, HEPA vacuuming and microfiber wiping.

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