ERMI and HERTSMI-2: What Dust Testing Can and Cannot Tell You in Maine
ERMI and HERTSMI-2 are the dust tests most CIRS-literate physicians reference. This guide explains what they measure, how to collect a sample that means something, how to read the scores, and the honest limitations nobody selling you a kit will mention.
What Maine changes about the picture
Cold humid continental with long winters. Very old housing stock; retrofitted insulation without air sealing creates condensation patterns the original buildings never had.
Protocols are national; moisture is local. In Maine, the pressure a building lives under comes from specific, predictable directions — and this protocol should be read with those directions in mind, because they decide where the risk concentrates, which assemblies fail first, and what a defensible local scope looks like.
The ME moisture drivers to read this against
- Ice damming
- Damp stone and rubble foundations
- Winter condensation in tightened old homes
What never changes — anywhere
Maine changes where the risk concentrates — never the order of operations. Moisture gets located, testing characterizes the exposure, the water gets fixed before the mold, remediation runs under verified containment, and an independent third party confirms the result.
The full protocol below covers the national playbook in depth — read it alongside the ME context above.
Read the full protocol: ERMI and HERTSMI-2: What Dust Testing Can and Cannot Tell You →
- What these tests actually measure
- Why dust beats a single air sample
- Collection determines whether the result means anything
- Reading the numbers without panic
- The honest limitations
- When to retest
Maine questions
Does this protocol change in Maine?
The sequence never changes — locate moisture, test honestly, fix water before mold, remediate under containment, verify independently. What changes in Maine is where the moisture pressure comes from: ice damming That determines where instruments go first and which assemblies earn suspicion.
What should Maine households check first?
Start with the failure modes this housing stock is known for. Very old housing stock; retrofitted insulation without air sealing creates condensation patterns the original buildings never had. A moisture-focused assessment that ignores those patterns is guessing.
Can I get matched with a vetted provider in Maine?
Yes — matching runs in all 50 states. Every provider is vetted on containment discipline, fine-particle competence, and willingness to be independently verified. Matching is free for households.
THIS PROTOCOL IN OTHER PRIORITY MARKETS → California · Colorado · Florida · Nevada · Texas
NEXT IN THE ME LIBRARY → The Mold Inspection, Done Right: A Homeowner's Field Manual in Maine