A call for change
A shift is underway in mould remediation and indoor air quality. US-based National Organization of Remediators and Microbial Inspectors executive director Doug Hoffman wants contractors to approach every job with science, not assumptions.
“Prognosis without diagnosis is malpractice,” Hoffman says. “We’d never accept that from a doctor, so why are we doing it in mould remediation?”
He argues that every project should begin and end with a thorough environmental assessment. While licensing laws may separate the roles of assessor and remediator, science remains essential to both. Assessment protects clients and shields contractors from costly mistakes.
A paradigm shift
Hoffman’s push stems from his early industry experiences, where he saw plenty of discussion about how to do the work but little about the science behind it. He sees diagnosis-driven remediation as the next critical step for the sector.
He compares it to the pandemic years, when industries had to pivot fast. “Assessment is not optional – it’s essential,” he says.
Why testing matters
Testing creates a baseline, exposes hidden issues and provides measurable proof of progress. It also prepares contractors for post-remediation verification, reducing the risk of expensive rework.
“Without testing, you’re flying blind,” Hoffman says. “And you’re leaving yourself open to liability.”
Objective lab data holds weight where subjective clues cannot. It turns educated guesses into defensible evidence.
Shifting liability
Hoffman stresses the power of shifting liability through third-party validation. Using licensed labs, following standards like IICRC S520 and NORMI Professional Practices, and embedding certified training in contracts helps contractors protect themselves.
“If I send a sample to a lab and they misidentify it, I’m not the one on the hook—they are,” he says.
Science saves money
Accurate diagnosis often saves thousands. In one case, a kitchen that looked destined for a full tear-out was saved by identifying high humidity from an oversized HVAC unit. What could have cost tens of thousands was resolved for just over $2000.
“Assessment is about understanding why mould is there,” Hoffman says. “That’s how you control costs and timelines.”
Screening vs testing
Hoffman draws a clear line between screening tools and diagnostic testing. ATP meters can flag potential issues, but only lab testing delivers proof. Both have their place, but testing confirms what’s real.
Building industry standards
States like Florida, Louisiana, New York and Texas already require licensing for assessors and remediators, and others are following. Local health departments often look to NORMI and IICRC for guidance.
“This is about protecting the public,” Hoffman says. “That starts with contractors doing things the right way, backed by science.”
For Hoffman, testing should be an expectation, not an add-on. “Every project needs assessment – front end, interim and post. That’s how you protect the client, protect yourself and prove the work actually worked.”
A longer version of this article first appeared in Cleanfax.
