• October 01, 2026

What Belongs in a Mold Remediation Protocol

A mold remediation protocol is a written scope of work that tells a contractor exactly what to remove, how to contain the area, how to clean what stays, how dry the building has to get, and what the job must measure at the end to count as finished. It is written by the assessor or indoor environmental professional, not by the company that will do the work.

An assessment tells you what is wrong. A protocol turns that into something a crew can build and an owner can hold someone to. This page walks through one section by section and gives you questions to ask of any document you were handed.

Why the protocol exists

Ask three companies to bid with no protocol and you get three different projects at three different prices. One bids the closet, one the bathroom, one the bathroom and subfloor. All three are defensible, because nobody defined the work.

• It makes bids comparable. Everyone prices the same square footage, containment class and clearance requirement, so the gap between bids is about the companies, not the scope.
• It fixes the scope before demolition. A scope set by a neutral party before anyone opens a wall is harder to grow later.
• It defines done. If nobody wrote down what success looks like, nobody can say afterward whether the job succeeded.

What is in a protocol, section by section

A protocol is a specification, detailed enough that a contractor who has never seen the property could build the job from it.

Identification and authorship

Address, unit or area, date of assessment, date of protocol, file number. Then who prepared it, their license or certification, and their firm. A protocol with no identifiable author is a memo.

Summary of findings

Where growth was observed, where elevated moisture was measured and with what instrument, what was found in wall cavities or under flooring, and what was sampled, with the lab report attached. If an area appears in the removal list but not in the findings, ask why.

Affected areas and condition classification

Each area listed with approximate square footage and classified under ANSI/IICRC S520. Condition 1 is normal fungal ecology, the finish line. Condition 2 is indirect contamination, meaning settled spores and fragments above normal levels with no active growth. Condition 3 is actual growth.

Classification drives the work: Condition 3 gets material removal, Condition 2 gets cleaning. Killing mold does not reclassify it: a surface can be entirely non-viable and still be Condition 2, because dead spores and fragments carry the allergens people react to.

The moisture source

The protocol names the water intrusion that caused the growth, requires it corrected, and requires the correction verified before any reconstruction. S520 puts responsibility for finding and correcting the source on the property owner rather than the remediator, which is why it is a stated condition and not a line in the contractor's bid. Where it is not positively identified, the protocol should call for the work to find it. See leak detection.

Containment specification

Type first: limited or full. EPA guidance puts limited containment at roughly 10 to 100 square feet and full containment above 100. Then the physical detail, where protocols get thin: where each barrier goes, which doorway becomes the entry, whether a decontamination chamber is required, and what gets sealed inside, including every HVAC register. See containment.

Engineering controls

How many HEPA-filtered air units, what airflow, whether they exhaust outdoors to hold negative pressure, and how long they run. Filtration typically runs 48 to 72 hours and continues after demolition stops, the part most commonly cut short. See air scrubbers.

Materials to be removed

Listed by area and material with quantities: drywall, insulation, carpet and pad, baseboard, cabinetry, subfloor. Then the cut distance. MI&T recommends cutting at least 12 inches past visible growth, and the protocol should state it rather than leave it to the crew. It should also name what is salvaged and cleaned, because omitting that invites a contractor to remove more. See removing damaged material.

Cleaning methods by material

For everything that stays, the protocol specifies the method, not the outcome: HEPA vacuuming, damp wiping with a named cleaner, detail cleaning of framing, sanding where growth has penetrated, and the order those happen in. See HEPA vacuums and cleaning products.

Drying targets and the dry standard

The protocol states the moisture content affected materials must reach and what it is measured against: the same material in an unaffected part of the building. "Dry to normal levels" is not a target. Indoor humidity belongs here too, held below 60% and ideally 30 to 50%. See dehumidifiers.

Personal protective equipment

Minimum respiratory, eye and skin protection, scaled to containment type and condition classification. "Appropriate PPE" is not a specification. See PPE for mold work.

Clearance criteria

What the project must meet to be complete, and who decides. Typically all visible growth and debris removed, surfaces visibly clean, materials at or below the dry standard, and sampling consistent with an unaffected reference area. The remediator's own walk-through is a post remediation evaluation (PRE). The independent third party check is a post remediation verification (PRV). Only the second is a clearance. See clearance testing.

Documentation and reporting

Daily logs, dated moisture readings, photographs before and after, disposal records, and the final report the contractor hands over. That paperwork is what makes a property disclosable and a claim defensible later.

What a weak protocol looks like

If a document could describe any job on any property, it is not a protocol.

• Areas with no square footage. "Affected areas in the basement" sets no containment class, no quantity, no price.
• "Clean all affected surfaces" with no method. Cleaning is a set of specific operations, and not naming them hands that decision to the party being paid.
• No cut distance. The most common omission, and the widest source of variance between bids on the same wall.
• No drying target. Dry then means whatever the crew says on the day they demobilize.
• No clearance criteria. The job ends when the contractor says it is over.
• Nobody named to verify. It defaults to whoever did the work.

A protocol written from photographs rather than a walk-through reads this way almost every time.

Deviations and change orders

Conditions change once a wall is open. Growth runs farther than expected, a second source turns up, or the containment cannot go where the drawing puts it. That is normal. Deciding it quietly on site is not.

S520 expects deviations to be documented in writing and communicated to the interested parties: the owner, the assessor and, on a claim, the adjuster. That record separates a legitimate discovery from scope creep. The pattern to watch is a verbal expansion mid-job with the walls already open. Get the changed quantity and price in writing first. See mold removal scams.

A checklist for reviewing a protocol you were handed

Every no is worth asking about before you sign.

• Author named, credentialed, independent of the bidder?
• A square footage and Condition 1, 2 or 3 classification for every area?
• Each scope item traced to a finding in the assessment?
• Moisture source identified, correction required before reconstruction?
• Containment type, barrier locations, HVAC registers sealed?
• Air filtration specified, with run time after demolition stops?
• Materials listed by area and material, with a cut distance?
• A cleaning method named for each material that stays?
• A numeric drying target against an unaffected reference area?
• Clearance criteria written down, and the verifying party named?
• Deviations required in writing?
• Could this document describe a different property unchanged?

Who should write it, and why not the contractor

A company that writes the scope and then bills for it has an interest in writing a bigger one. That is structural, not an accusation, and it runs both ways: a contractor who already quoted wants a protocol that fits the quote. The conflict returns at the end: if the party that did the work decides whether it passed, the clearance is an internal opinion.

Florida, Texas and New York prohibit one firm from both assessing and remediating the same project. Elsewhere it is left to the owner to manage, and the way to do that is to keep the roles in different hands. Choosing a mold removal company covers what to ask next.

Frequently asked questions

• What is a mold remediation protocol?

  A written scope of work telling a remediation contractor which areas are affected and how they are classified, what containment to build, what to remove and how far past visible growth to cut, and what the job must meet to be considered finished.

• Who writes the protocol?

  An independent assessor or indoor environmental professional, based on their own inspection and sampling. It is the deliverable that turns an assessment into a buildable scope. The contractor executes the protocol rather than writing it, and a third party later verifies its criteria were met.

• Do I need a protocol for a small mold problem?

  Not always. A small, visible, isolated area with an obvious moisture source suits a careful owner with proper PPE, and roughly 10 square feet is the reference point. Beyond that, or where growth is hidden or the HVAC is involved, the job needs containment and a written scope.

• Can the remediation company write their own protocol?

  In Florida, Texas and New York, no, because one firm is barred from both assessing and remediating the same project. Elsewhere it happens, but the party writing the scope is then the party billing for it, which gives them a direct interest in a larger scope.

• What if the contractor wants to change the scope?

  Conditions do change once walls are open, and legitimate discoveries are normal. S520 expects deviations to be documented in writing and communicated to the property owner and other interested parties rather than decided on site. Get the changed quantity and price in writing first.

• How much does a protocol cost?

  It is normally produced as part of an assessment rather than sold separately, so the real question is what the assessment costs. The drivers are building size, how many areas are involved, how much investigation the source needs, and how many samples go to the lab.

• What is the difference between a mold inspection and a protocol?

  The inspection is the investigation: looking, measuring moisture, sampling, and reporting what is wrong and how far it extends. The protocol is the instruction set that follows, written so a contractor can price and build the work and an independent party can later verify it.

Where MI&T fits

MI&T is an inspection and testing company. We do not perform mold remediation, we do not sell equipment or products, and we take no referral fees, which is what makes a scope we write neutral.

We assess the property, establish how far the problem extends, and produce the protocol a contractor bids and builds against. When the work is finished we verify it against the criteria in that document rather than anyone's opinion. If your protocol was written by the company that wants to do the work, a second opinion usually costs less than the difference between the two scopes.

Back to the mold remediation process