What clearance testing verifies
Visual inspection
- No visible mold in the remediated zone
- All affected materials removed
- Clean surfaces throughout
Moisture verification
- Affected materials and substrates dry
- Equilibrium moisture content achieved
- No active water source
Air sampling
- Spore counts at or below baseline
- No elevated species compared to outdoors
- Meeting IICRC S520 clearance criteria
Surface sampling (when applicable)
- No elevated spores on previously affected surfaces
- Dust testing via ERMI or similar
When clearance should fail
- Visible mold remaining (sometimes found only after containment removal)
- Moisture in cavities still present
- Air samples show elevated spore counts
- Adjacent rooms show spore counts (cross-contamination)
- Musty odor detected
When clearance questionably passes
- Sampling method inadequate (single sample, wrong location)
- Outdoor baseline not properly established
- Lab used is carrier-contracted rather than independent
- Remediator self-cleared without third-party verification
Counter-testing approach
- Independent IH performs post-remediation testing
- Multiple samples (visible area, adjacent rooms, HVAC)
- Accredited lab
- Comparison to baseline
- Written clearance report
When additional work required
- Identify the specific failure mode
- Additional containment for re-remediation
- Scope additional materials for removal
- Re-test after additional work
- Document all as part of original claim scope