Mold Remediation
Mold Remediation
The Mold Remediation domain tests the principles of safe mold work: moisture correction, containment, personal protection, physical removal, cleaning, and clearance. The exam favors the sequence “fix moisture, contain, remove, clean, verify” over chemical shortcuts.
Core rules
- Moisture first: mold cannot grow without moisture. Identify and correct the water source and dry the assembly before or during remediation. Recurrence is a process failure, not a cleaning failure.
- Condition categories: Condition 1 is normal or settled spores; Condition 2 is settled spores in an atypical location; Condition 3 is actual mold growth. Remediation scope depends on condition and area.
- Containment: use polyethylene barriers and negative air machines with HEPA filtration for larger projects; maintain negative pressure relative to occupied space. Small isolated areas may use limited containment, but the principle is to prevent spore migration.
- PPE: use a respirator rated N95 or better (P100 for many mold jobs), eye protection, gloves, and disposable coveralls. Do not disturb mold without protection.
- Removal and cleaning: HEPA vacuum surfaces, remove porous materials that cannot be cleaned (drywall, insulation), then clean non-porous framing with detergent. Biocides may be used after cleaning but never as the sole remedy; ozone is not a substitute for removal.
- Clearance: verify visually, confirm moisture is corrected, and use independent air sampling if the project scope or client requires it. Clearance is not based on smell alone.
Worked example
A bathroom has about 6 square feet of mold on drywall from a slow supply-line leak. Reasoning: fix the leak, set up limited containment with poly and negative air, wear PPE, remove the moldy drywall, HEPA vacuum the cavity, clean the studs with detergent, and dry the assembly. Verify moisture before closing. If the area were larger than about 10 square feet or involved HVAC, full containment and a written remediation plan would be expected.
Traps that cost marks
- Bleaching porous materials instead of removing them.
- Skipping moisture correction, so mold returns.
- No containment or negative pressure on a significant job.
- Relying on ozone or fogging instead of physical removal.
- Declaring clearance without visual verification and moisture checks.