Matt Kelly's 13-Step Mold Remediation Process

I've worked with thousands of families dealing with mold toxicity, and one of the most frustrating things I see is how often mold remediation fails.

Families spend thousands, sometimes tens of thousands of dollars, trying to make their homes safe again. They hire professionals, follow recommendations, tear apart their homes, and trust that the work is being done correctly.

Then, months later, they're still dealing with symptoms, their environmental testing still shows concerning mold levels, or they discover hidden contamination that was never addressed.

And now they're facing another remediation.

Here's the problem: Just because a company remediates mold doesn't mean they understand what it takes to make a home suitable for someone dealing with mold-related illness.

Some companies are excellent at removing visible mold but don't understand the importance of identifying hidden sources, controlling microscopic particles, preventing cross-contamination, or addressing contamination throughout the rest of the home.

Others follow standard remediation practices but don't recognize that highly mold-sensitive individuals may need additional precautions and a more thorough approach.

And sometimes the remediation company does everything correctly, but the original investigation missed significant mold sources. Even the best remediator in the country can't fix problems nobody found.

That's why I created this 13-step process.

It's based on what I've learned helping families investigate their homes, interpret environmental testing, and navigate remediation projects, including seeing what happens when important steps are missed.

My goal isn't to teach homeowners how to become mold remediators. It's to help you recognize a company that actually knows what it's doing.

Before hiring anyone, use these 13 steps as a guide for your conversations. Ask how the company handles each part of the process. Listen for thoughtful, detailed answers that demonstrate experience, not simply promises that they'll get rid of the mold.

A qualified company should be able to explain its methods, why it uses them, and how it plans to protect your home and family throughout the project.

You don't need to become an expert in remediation. But you absolutely deserve to understand what you're paying for.

The 13 Steps to a More Thorough Mold Remediation

1. Comprehensive Mold Investigation

A successful remediation starts long before anyone begins removing drywall.

My preferred approach is a three-step investigation:

• ERMI+ dust testing to identify concerning toxigenic mold species and their concentrations throughout the home.
• A trained mold detection dog to help locate potential hidden mold sources that may otherwise go undiscovered.
• A qualified mold inspector to investigate the findings, confirm contamination, identify moisture problems, and develop a detailed remediation plan.

When available, I also like to review mycotoxin testing from the people living in the home. These results can provide additional clues about possible exposures and help prioritize which molds and potential sources deserve closer investigation. Human mycotoxin results cannot, by themselves, prove which building or mold species produced the detected toxins.

The goal is to find the most concerning toxigenic molds identified through testing, not simply remove whatever mold happens to be visible.

Even the best remediation company in the country can only fix the problems that have been identified. If the investigation misses hidden mold, the remediation may be performed perfectly while significant contamination remains.

2. Occupant Health & Sensitivity Assessment

Not every household has the same needs.

If someone in the home is dealing with mold toxicity, MCAS, neurological symptoms, or significant chemical sensitivities, the remediation company needs to understand that before beginning work.

This may influence containment procedures, cleaning methods, products used, and whether occupants should temporarily relocate.

3. Detailed Remediation Plan

The qualified mold inspector should create and deliver a detailed remediation plan as part of the final step of the three-step investigation process.

If the inspector hasn't provided one, the remediation company needs to develop a written plan using all available ERMI+ results, mold dog findings, inspection reports, and moisture assessments.

The plan should identify affected areas, materials requiring removal, containment and negative pressure requirements, cleaning procedures, moisture corrections, and verification methods.

It should also establish independent clearance criteria before work begins, including what happens if additional contamination is discovered or the project doesn't pass verification.

4. Protect Occupants & Belongings

Contamination doesn't necessarily stay confined to the area where mold is growing.

Mold spores, microscopic fragments, and contaminated dust can settle on furniture, clothing, electronics, and personal belongings.

Before remediation begins, there should be a plan for protecting unaffected spaces and evaluating potentially contaminated belongings.

5. Containment, Negative Pressure & Worker Protection

This is one of the most important parts of proper remediation.

Disturbing mold-contaminated materials can release large amounts of microscopic particles. Without effective containment, remediation can spread contamination into previously unaffected areas.

Work areas should be isolated using appropriate barriers and HEPA-filtered negative air equipment where necessary.

Workers should also use suitable protective equipment and follow proper entry, exit, and equipment decontamination procedures.

Containment should remain in place until independent verification confirms that the work area meets the agreed clearance criteria, unless the independent inspector authorizes another procedure.

6. Remove Mold-Contaminated Materials

Mold remediation should focus on physically removing contamination, not simply treating or covering it.

Contaminated porous materials that cannot be adequately cleaned generally need to be removed. Remaining structural materials should be cleaned using appropriate physical methods.

Fogging, spraying, painting, and encapsulation are not substitutes for necessary mold removal.

Professional mold remediation should follow the ANSI/IICRC S520 Standard for Professional Mold Remediation as a minimum. However, meeting industry standards doesn't automatically mean a home has been adequately addressed for someone dealing with mold toxicity or severe mold sensitivity. Additional investigation, contamination removal, detailed cleaning, and verification may be necessary.

7. Correct Moisture Sources

Removing mold without correcting the moisture problem is asking for it to return.

Water intrusion, plumbing leaks, condensation, drainage issues, and building envelope defects all need to be investigated and corrected.

Affected materials should also be verified as appropriately dry before reconstruction.

8. Structural Cleaning & Decontamination

Once contaminated materials have been removed, the remaining structural surfaces still require thorough cleaning.

This includes appropriate HEPA vacuuming, mechanical cleaning, and damp wiping to address residual spores, fragments, and contaminated dust.

The objective isn't simply to make the framing look clean. It's to remove contamination that could remain in the work area.

9. HVAC Inspection & Cleaning

Your HVAC system can move particles throughout the home, which makes it an important part of the investigation and remediation process.

Air handlers, coils, blower compartments, return ducts, supply ducts, and filtration components should be evaluated for contamination.

Affected components may require professional cleaning or replacement, depending on their condition and materials.

10. Whole-Home Small-Particle Cleaning

This is a step I see overlooked far too often.

Even after the original mold growth has been removed, microscopic particles and contaminated dust may remain throughout the home.

Detailed small-particle cleaning should address affected and potentially cross-contaminated spaces, including ceilings, walls, floors, trim, ledges, furniture, and other dust reservoirs.

Appropriate HEPA vacuuming, damp wiping, and Swiffering with disposable dry or lightly dampened microfiber-style cloths can help capture and remove fine particles that ordinary household cleaning may leave behind. Cloths and pads should be changed frequently to avoid redistributing contamination.

For highly mold-sensitive individuals, removing residual contamination can be just as important as removing the original mold growth.

11. Independent Post-Remediation Verification

The company performing the remediation should not be the only party deciding whether its own work was successful.

I recommend using a qualified, independent inspector with no financial interest in the remediation work.

Verification should assess whether contaminated materials were properly removed, whether remaining surfaces are clean, whether moisture problems have been corrected, and whether agreed environmental criteria have been met.

Passing an air test alone does not establish that a home is free of problematic mold contamination.

If verification identifies incomplete removal, residual contamination, excessive moisture, or inadequate cleaning, those deficiencies should be corrected before the area is cleared.

12. Documentation & Prevention Plan

A professional remediation should leave you with more than a bill and a repaired wall.

You should receive documentation showing what was discovered, which materials were removed, what moisture problems were corrected, how the area was cleaned, and the results of independent verification.

There should also be recommendations for preventing future moisture problems.

13. 90-Day Post-Remediation ERMI+ Verification

This is an additional step I recommend after the remediation, HVAC cleaning, and whole-home small-particle cleaning have been completed.

Allow dust to naturally accumulate along baseboards for at least 90 days before collecting a new ERMI+ sample.

Compare the results with the original ERMI+ to evaluate whether the concerning mold species identified before remediation have been reduced and whether problematic concentrations remain.

I focus on individual mold species and their concentrations, not simply the overall ERMI score.

This follow-up can help identify lingering contamination, missed sources, or areas requiring further investigation. It is an additional assessment rather than a guarantee that every hidden source has been eliminated.

The Most Important Thing I Want Homeowners to Understand

Finding the mold is just as important as removing it.

I've seen families spend enormous amounts of money on remediation, only to discover that significant mold sources were missed, containment was inadequate, or contaminated dust was left behind.

Sometimes the remediation company was careless. Other times, the company did exactly what it was hired to do, but the original investigation was incomplete.

Either way, the family is left dealing with the consequences.

That's why I encourage people to think beyond simply hiring someone who says they remove mold.

You want a company that understands the entire process, welcomes detailed testing and independent verification, and recognizes the additional challenges faced by mold-sensitive occupants. If you're evaluating your options, it can help to find mold remediation professionals who can walk you through each of these steps.

You don't need a remediation company that promises perfection. You need one that understands the risks, has a thorough process, communicates clearly, and takes responsibility for its work.

Use these 13 steps when interviewing companies. Ask questions. Request explanations. And don't be afraid to keep looking if the answers don't give you confidence.

A company doesn't have to follow every detail of my preferred approach to do excellent work. But it should be able to explain how its methods achieve the same essential objectives.

The goal isn't simply a home that looks clean.

It's a home where the sources of contamination have been identified, properly addressed, and carefully verified, giving your family a better opportunity to recover.