Post-Remediation Verification
Clearance Testing Grounded in IICRC S520
Post-remediation verification (PRV) is a clearance assessment performed after mold remediation is complete. It answers a single question with data: did the remediation work?
IICRC S520 — the industry’s primary standard for professional mold remediation — defines clearance criteria and specifies that verification should be performed by an independent assessor who was not involved in the remediation. Coastal Air Assessments conducts PRV only. We have no remediation affiliations and no financial stake in the outcome.
What IICRC S520 says: The standard specifies that post-remediation verification should be performed by an independent party. When the same company that performed the remediation also provides clearance, the science is no longer independent — the financial incentive to pass is built in. Always verify through the Florida DBPR that your assessor holds an active Mold Assessor License (MRSA prefix) separate from the remediator.
PRV assessment protocol:
- Visual inspection of all remediated areas per IICRC S520 clearance scope
- Moisture readings confirming building materials have returned to acceptable levels
- Thermal imaging to identify any remaining anomalies in treated areas
- Air sampling inside and outside remediated areas using IICRC S520 clearance sampling strategy
- Surface sampling where warranted to verify complete removal of biological contamination
- Certified accredited laboratory analysis of all samples
- Written clearance report with methodology, laboratory data, clearance determination, and next steps if clearance criteria are not met
When is a PRV required?
- After any professional mold remediation project before re-occupancy
- Insurance claim documentation following water damage and remediation
- Real estate transactions where mold was identified and remediated
- Landlord-tenant disputes involving habitability and mold remediation
- Construction projects where mold-affected materials were part of the scope
Frequently Asked Questions
What does IICRC S520 say about post-remediation clearance?
IICRC S520 defines clearance criteria including visual confirmation of mold removal, acceptable moisture readings in building materials, and air sampling results consistent with or better than outdoor control samples. The standard specifies independent verification as best practice. Coastal Air Assessments follows S520 clearance protocols on every PRV.
Can the remediation company perform their own clearance?
They can, but it violates the independence principle that gives clearance testing its meaning. A company that profits from the remediation has a financial incentive to declare the work successful. IICRC S520 and most insurance carriers recognize independent verification as the appropriate standard. Coastal Air Assessments has no remediation affiliations.
When should PRV be scheduled relative to remediation completion?
PRV should be conducted after all remediation work is complete and containment has been removed, but before reconstruction or repainting of affected areas. Performing PRV through active containment or after surfaces have been painted limits what can be assessed. Contact us to coordinate the appropriate timing.
Will the clearance report be accepted by insurance?
Yes. Our PRV reports document methodology, sampling locations, laboratory data, and a professional clearance determination consistent with IICRC S520. This format is accepted by most homeowners insurance carriers and suitable for real estate disclosures.
