LAS VEGAS — The IICRC S520 Standard for Professional Mold Remediation is the restoration industry's primary reference document for mold assessment and remediation, providing the scientific basis and procedural framework for professional mold remediation work. Here is what contractors and property owners need to know about its key requirements.
The S520 standard establishes a three-step process for mold remediation: assessment, remediation, and post-remediation verification. Assessment involves identifying the source of moisture, determining the extent of mold growth, and developing a remediation plan. Remediation involves containing the affected area, removing mold-contaminated materials, and cleaning surfaces. Post-remediation verification involves testing to confirm that mold levels have returned to normal background concentrations.
The standard defines three condition levels for mold contamination: Condition 1 (normal fungal ecology), Condition 2 (settled spores or fungal growth not associated with current water damage), and Condition 3 (actual mold growth). Remediation protocols vary depending on the condition level and the type of affected materials.
The S520 standard requires that remediation work be performed under containment to prevent the spread of mold spores to unaffected areas. The level of containment required depends on the size and condition level of the affected area, ranging from limited containment for small Condition 2 areas to full containment with negative air pressure for large Condition 3 areas.
Post-remediation verification testing is a critical component of the S520 standard. The standard requires that post-remediation air and surface samples be compared to samples from unaffected reference areas to confirm that mold levels have returned to Condition 1. Restoration contractors should use an independent industrial hygienist for post-remediation testing to ensure objectivity.
