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Mold Remediation · Glossary

Mold remediation glossary

Most mold estimates use a small set of technical terms. Containment means sealing the work area off with plastic sheeting. Negative air means keeping the pressure inside that area lower than outside so spores cannot drift out. HEPA refers to filters that capture fine particles. Post-remediation verification is the independent check that the job is finished.

Knowing these terms is a defense mechanism. A contractor who cannot explain what negative air pressure does, or who lists "antimicrobial application" as the primary treatment rather than physical removal, is telling you something about how the job will be done.

A few definitions worth having in your head before the estimate arrives: remediation is returning indoor mold to normal background levels and fixing the moisture, not sterilizing the house. Encapsulation is sealing a cleaned surface with a coating — appropriate for structural wood, not a substitute for removing moldy drywall. Mycotoxin refers to compounds some molds can produce; it is a real word that is heavily overused in marketing. ANSI/IICRC S520 is the industry procedural standard, currently in its fourth edition (2024).

You will also see water category language borrowed from restoration work — clean water, gray water, and black water. Category matters: contaminated water changes the job from a cleanup into a professional remediation regardless of area.

How to choose

Learn three terms minimum
Containment, negative air, and post-remediation verification. These three tell you whether the plan is real.
Treat 'antimicrobial' as a supporting act
Chemicals do not replace removal. Dead mold still has to come out.
Ask what 'mycotoxin' means in this quote
If the answer is a health claim about you rather than a description of the work, that is a sales pitch.
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All mold remediation glossary

Spore

Remediation

Containment

PRV

HVAC Mold

Mycotoxin Education

FAQ

Mold Remediation glossary — common questions

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A machine draws air out of the sealed work area and filters it, keeping the pressure inside lower than the rest of the house. That means air flows in, not out, so spores disturbed during removal do not spread.
An independent check that the area is visibly clean, dry, odor-free, and — where sampling is used — adequately cleaned. The EPA notes surface sampling can be useful to determine whether an area has been adequately remediated.
It refers to the ANSI/IICRC S520 Standard for Professional Mold Remediation, the recognized procedural standard in the United States, currently in its fourth edition (2024).
No. Mold-resistant materials slow growth; nothing prevents it if the material stays wet. Moisture control is the only real prevention.
Sources

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