ANSI/IICRC S520
Mold Remediation
Mold remediation is not mold cleaning — it is a controlled, science-driven process that eliminates the source, contains the colony, and confirms clearance through independent testing. DRR follows ANSI/IICRC S520 from initial sampling through final third-party air clearance.
What We Do
Source Elimination to Third-Party Clearance
ERMI Sampling
Environmental Relative Moldiness Index sampling identifies species present and contamination levels, providing a defensible scientific baseline before remediation begins and a benchmark for clearance comparison.
Containment per S520
Critical barriers and negative air pressure containment prevent cross-contamination during remediation. Our containment protocols are sized and constructed according to the S520 standard for the confirmed contamination level.
Source Elimination
Mold cannot be remediated without addressing the moisture source. We identify and eliminate the water intrusion pathway before any remediation begins — preventing recurrence and protecting your investment.
HEPA Filtration
HEPA air scrubbers run continuously throughout the remediation process, capturing airborne spores displaced during material removal and surface cleaning, and maintaining negative air pressure within the containment zone.
Antimicrobial Treatment
EPA-registered antimicrobial agents are applied to affected substrates following physical removal of mold colonies, inhibiting regrowth on surfaces that cannot be fully removed or that are adjacent to affected areas.
Clearance Testing
Every remediation closes with a third-party air sample collected by an independent industrial hygienist. Clearance is not issued by DRR — it is issued by an independent laboratory, protecting you from liability.
Why DRR
Remediation Doesn't Close Without Independent Clearance
We never skip clearance testing. Every remediation closes with a third-party air sample. This is not optional — it is the only scientifically valid way to confirm that remediation was successful. Any contractor who skips clearance testing is leaving you with unverified results and potential liability.