ERMI and HERTSMI-2: What Dust Testing Can and Cannot Tell You in Indiana
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 Indiana changes about the picture
Humid continental with four full seasons. Mix of basements and crawl spaces; below-grade humidity control drives outcomes.
Protocols are national; moisture is local. In Indiana, 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 IN moisture drivers to read this against
- Basement and crawl space humidity
- Spring flooding
- Ice damming
What never changes — anywhere
The sequence holds in Indiana exactly as it does everywhere else: locate the moisture, characterize the exposure with testing collected correctly, fix the water before touching the mold, remediate under verified containment, fine-clean, and verify independently. Every shortcut this industry sells is a reordering of that list.
The full protocol below covers the national playbook in depth — read it alongside the IN 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
Indiana questions
Does this protocol change in Indiana?
The sequence never changes — locate moisture, test honestly, fix water before mold, remediate under containment, verify independently. What changes in Indiana is where the moisture pressure comes from: basement and crawl space humidity That determines where instruments go first and which assemblies earn suspicion.
What should Indiana households check first?
Start with the failure modes this housing stock is known for. Mix of basements and crawl spaces; below-grade humidity control drives outcomes. A moisture-focused assessment that ignores those patterns is guessing.
Can I get matched with a vetted provider in Indiana?
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 IN LIBRARY → The Mold Inspection, Done Right: A Homeowner's Field Manual in Indiana