Mould remediation in Australia is at a pivotal moment, with growing recognition from both the medical and cleaning sectors that indoor mould exposure carries genuine health consequences extending well beyond visible growth. Epidemiological research consistently links indoor dampness and mould to respiratory illness, inflammatory conditions and a range of systemic health effects. As that body of evidence deepens, so does the scrutiny on the professionals tasked with assessing and remediating affected buildings. The problem, as leading experts in the field are quick to identify, is that the industry’s technical capability has struggled to keep pace with the science.
“Medically informed remediation is significantly strengthening our professional approach to understanding indoor building science and indoor environmental health,” ISSA senior director Dr Gavin Macgregor-Skinner says. “The cleaning and restoration industry is now bridging mycology, toxicology and health to determine how exposure levels translate to health risks and mould-related illness.” It is an exciting and expanding frontier, but one that demands a level of expertise the sector is still actively building.
Getting sampling right
Central to that knowledge gap is the question of mould sampling – specifically how, when and where to take a sample. Tools such as the Environmental Relative Moldiness Index (ERMI) and the Health Effects Roster of Type-Specific Formers of Mycotoxins and Inflammagens (HERTSMI-2) have added genuine diagnostic value to the profession, particularly when assessing environments occupied by medically sensitive individuals or those suffering from Chronic Inflammatory Response Syndrome (CIRS). ERMI’s DNA-based analysis of settled dust can detect contamination patterns that short-duration air sampling frequently misses, while HERTSMI-2 provides a focused clinical scoring framework built around five mould species most strongly associated with relapse in mould-sensitised patients.
What these tools do not provide, however, is guidance on how to deploy them correctly. NORMI executive director Doug Hoffman says elevated scores are diagnostic indicators, not stand-alone answers. “Neither test should ever be evaluated without a moisture investigation, without HVAC system evaluation, without examining the building envelope, without considering occupant health history,” he says.
Interpreting ERMI or HERTSMI-2 results in isolation, divorced from the comprehensive building science context, is one of the most common and consequential mistakes occurring in the marketplace today. A score drawn from a poorly located sample, taken without understanding the pressure relationships or moisture dynamics of a structure, tells you very little about the actual condition of that building.
A competent assessor brings skills to a job that go beyond knowing which test to order. Tracing moisture sources, mapping affected areas, measuring psychrometric data and designing a sampling plan that combines air, surface, dust and microbial volatile organic compound (mVOC) testing are all foundational competencies. So too is the ability to interpret laboratory results against established frameworks and translate those findings into a clear, actionable remediation protocol.
Closing the skills gap
As medically informed remediation gains traction, the sector faces an urgent and exciting opportunity to address what Macgregor-Skinner and Hoffman describe as critical training gaps across several interconnected areas. Technicians increasingly need working knowledge of mycotoxins and endotoxins, including how these sub-micron particles behave in the built environment, how they bond to surfaces and how they affect sensitive occupants. Standard containment practices designed around visible dust and whole mould spores, which typically range from two to 20 microns, provide insufficient protection against mycotoxins and mould fragments that can be smaller than 0.1 microns. Source-containment and engineering controls are the necessary response.
Alongside containment, small particle cleaning protocols require meticulous, multi-pass HEPA vacuuming paired with targeted surfactant and microfibre wiping designed to physically lift and remove sub-micron particles from surfaces, and training in these techniques demands genuine rigour. Equally important is literacy in advanced environmental testing, or the capacity to interpret DNA-based results, dust analysis and mycotoxin panels meaningfully and to use those findings to collaborate with medical professionals and indoor environmental consultants.
“Cross-disciplinary health literacy is essential,” Macgregor-Skinner notes, describing the shift in mindset from sceptical to empathetic and evidence-supported as fundamental to the industry’s maturation. Cleaning and restoration professionals who understand the medical reality of the occupants they serve, and who can communicate effectively within that context, are far better placed to deliver outcomes that genuinely improve indoor environmental health. Mould assessment has always demanded technical competence. What the sector now recognises is that it demands considerably more.
