Mold and Microbial Remediation
What this domain tests
Remediation tests whether you can plan and verify source removal, containment, drying, and cleaning under IICRC S520-style principles without spreading contamination.
Core rules
- Correct the moisture source before or during remediation; otherwise mold returns.
- Classify conditions: normal (Condition 1), settled spores or damp materials (Condition 2), and actual growth (Condition 3). The plan follows condition, material, and area.
- Use critical barriers and negative pressure with HEPA filtration where containment is required. Maintain pressure differentials and verify with a manometer or smoke test.
- Remove porous materials that cannot be cleaned; HEPA-vacuum and damp-wipe semi-porous and non-porous surfaces. Antimicrobials are not a substitute for cleaning and must follow the label.
- Dry wet structures quickly, typically within 24-48 hours, and document moisture content.
- Clearance should be performed after work and drying, ideally by an independent assessor using visual inspection plus appropriate sampling or monitoring.
Worked example
A 3 ft by 3 ft patch of mold is on bathroom ceiling drywall from a roof leak. Reasoning: fix the roof leak, establish contained negative pressure, remove the wet drywall, HEPA-vacuum the framing, damp-wipe and dry, then verify moisture. Clearance follows visual inspection and, if specified, air sampling. Fogging the room would not remove the reservoir.
Traps
- Painting over mold or using bleach on porous material.
- Running containment without verifying negative pressure.
- Declaring clearance before materials are dry.
- Using antimicrobial fogging as a standalone remedy.
- Skipping source repair and blaming recurring mold on the occupant.