Mold Remediation Checklist

Every mold job that goes sideways went sideways before anyone unrolled poly. The work in the S520 sequence starts with the water: if the leak is still leaking, the remediation is a cleaning service with an expiry date. Confirm the source is found and corrected — or scheduled and documented — before you commit a crew.

Next comes the paperwork that defines what you are actually being paid to do. On third-party or insurance work an indoor environmental professional (IEP) commonly writes the protocol; your scope of work answers it. Walk each affected area, decide the Condition 1, 2 or 3 classification room by room, and photograph everything before a single cut is made. Tell the occupant what will happen, what will be noisy, what will be removed and what will not come back.

Containment is the part clients cannot see and inspectors judge you on. Choose the containment type from the extent of the contamination and the work being done, build it so it survives a week of traffic, and seal the critical barriers — supply and return registers, door frames, chases, penetrations and any hole an air current found before you did.

Then prove the containment works instead of assuming it. Negative pressure should visibly draw the poly inward, and it is commonly verified with a manometer and recorded, not eyeballed once at 7 a.m. Size air filtration devices to the volume of the enclosure rather than the size of the truck — the ACH calculator converts room volume and machine CFM into air changes per hour and tells you how many units the space takes.

PPE is chosen from the extent of contamination and the method being used, not from habit. Aggressive removal of Condition 3 material behind full containment demands more protection than HEPA vacuuming settled dust in a small Condition 2 area. Decide the level before the crew arrives so nobody is improvising at the door.

Protection only counts if it seals and if it comes off cleanly. Tight-fitting respirators require medical clearance and fit testing under the OSHA respiratory protection standard, and the whole assembly has to be removed inside the decon chamber, rolled inward, bagged and disposed of. Doffing is where careful crews contaminate themselves and their trucks.

The S520 is built on source removal. Porous materials with actual growth generally come out; semi-porous and non-porous materials are candidates for cleaning. Cut back to a defensible line, remove in manageable sections, and keep the work damp enough to control dust without soaking what is left in place.

Debris handling is where the contamination either stays inside the containment or travels through the house. Bag inside the enclosure, seal the bag inside, wipe or HEPA-vacuum the outside of the bag, then pass it out through the chamber along a protected path to the dumpster. Track what left the building — quantity, material and destination — because the waste log is the part of the file nobody can reconstruct later.

Cleaning is not spraying. The commonly used sequence is HEPA vacuum, damp wipe with a detergent solution, then HEPA vacuum again once surfaces are dry — working top down so nothing you clean gets re-soiled by what is above it. Abrasive methods such as sanding, wire brushing or media blasting are used on framing where staining or embedded growth survives detail cleaning, and they demand tighter containment and better respiratory protection.

Clean the space, then clean everything that touched the space. Tools, hoses, cords, hand trucks, ladders and the outside of the air movers all get wiped or vacuumed before they cross the chamber. Antimicrobials, where used at all, are an adjunct to physical removal — never a substitute for it.

Mold work and drying work overlap: opened wall cavities, wet framing and residual moisture in the substrate all have to reach a dry standard before anything closes back up. Set the dry standard from readings in an unaffected material of the same type in the same building — not from a number someone remembers from a class.

Take readings from the same locations, in the same materials, with the same meter, every day, and record them. Equipment placement, air movement and dehumidification are the water-damage skill set that sits underneath mold work, which is why WRT is the prerequisite class — the drying side is covered in depth at WRTTraining.com.

Verification is the step that turns a finished job into a defensible one, and it is commonly performed by an independent IEP rather than by the remediator. Keep containment, negative pressure and equipment running until the verification is complete — tearing down early is the most expensive shortcut in mold work.

A verification typically starts with the visual: the area should be free of visible growth, free of visible dust and debris, and dry. From there the IEP applies the criteria in their own protocol, which may include moisture readings and sampling. Pass or fail criteria belong to the IEP and to the project documents, not to the crew — so read the protocol before the job, not on the day of the inspection.

The file is the product. Photographs at every phase, daily moisture and pressure logs, equipment records, waste documentation, the signed scope, change orders and the verification report are what defends the invoice months later when a memory of the job is the only other evidence.

Close out in front of the customer. Walk the space, show the before and after photos, explain what was removed, what was cleaned and what remains outside your scope — usually rebuild, source repair and contents. Get a signature on the completion, and hand over copies rather than promising them.