Fire & Smoke Restoration: Residue Testing, Cleaning Sequence & Contents

Welcome

Hello, and welcome. This is Super Structures General Contractors — a national general contractor headquartered in Powhatan, Virginia — here to help you and your clients build something that lasts. We're glad you're with us, and we look forward to connecting with you.

Alright, Fire & Smoke Restoration: Residue Testing, Cleaning Sequence & Contents. Don't let the plain title fool you. Here's the part that actually matters on the job: Fire restoration is decided by test cleaning, where every surface and every item is either cleanable, cleanable and then sealed, or replaced, and the contents inventory is where the claim is won or lost. Learn it well and your fire jobs stop smelling and your contents claims stop being disputed.

The intro covered soot types, the dry-before-wet rule, and the order of odor control. This lesson is the working method of the IICRC S700 Standard for Professional Fire and Smoke Damage Restoration, with the contents side that the companion S740 standard addresses, from the first hour through pack-back.

Emergency services in the first 24 hours

Before cleaning starts, a fire loss has to be stabilized:

• Board-up and roof tarp to secure the building and keep weather out, with photos of every opening covered.
• Water extraction and drying for the firefighting water, which often carries debris and is treated as Category 3.
• Corrosion control. Acidic residue on chrome, stainless, brass, marble, and electronics starts etching within days. Wipe or treat exposed metals and move electronics out of the atmosphere early.
• Temporary power and winterization where utilities are off, so pipes do not freeze and equipment can run.
• Release and safety. Nothing in the origin area is disturbed until the fire department and the carrier's investigator release it, and burned structure is evaluated before crews work under it. Older buildings still carry asbestos and lead rules after a fire.

Zoning the building and test cleaning

Walk the whole building, not just the fire room, and assign every space a zone: burn (charred materials and structural loss), heat affected (blistered paint, melted plastics, failed finishes), smoke affected (residue on surfaces but no heat damage), and odor only. Then test clean. A dry chemical sponge on a wall, a HEPA vacuum pass on a ceiling, and a small patch with an alkaline cleaner on a cabinet door tell you what each surface will do. The outcomes are the whole scope:

• Cleanable: the residue comes off and the surface is sound. Clean it.
• Cleanable then sealed: residue comes off but odor remains in the substrate, common on framing, subfloor, and unfinished wood. Clean, then seal with an odor-blocking primer before finishes.
• Replace: the residue will not release, the surface is damaged, or cleaning costs more than replacement. Textured ceilings, attic insulation, flex duct, particleboard cabinets, and drywall near the burn usually land here. Photograph the test spots. The before-and-after of a 12 inch square is the most persuasive thing in the estimate.

The cleaning sequence that works

• Dry first. HEPA vacuum ceilings, walls, and contents, then dry sponge in overlapping strokes, changing the sponge face as it loads. Wet cleaning on dry soot drives it into the paint.
• Then wet. Wall washing with the cleaner matched to the residue (alkaline for greasy wet smoke and protein, milder for light dry smoke), working in sections and rinsing so streaks do not set.
• Top down for dust, bottom up for washing. Vacuum and dry sponge from the ceiling down so fallout lands on surfaces not yet cleaned; wash walls from the bottom up so dirty runs do not streak down a residue-covered wall and leave marks harder to remove than the soot.
• HVAC. Seal the registers during cleaning, then clean the ductwork to the industry duct-cleaning standard and replace what cannot be cleaned. Running the system during the job recoats everything.
• Char removal. Lightly charred framing is cleaned by sanding or media blasting with dry ice or soda, then sealed; deeply charred members are replaced as the engineer or building official directs.
• Deodorize last, then seal. Thermal fogging follows the path the smoke took; hydroxyl generators can run in occupied spaces; ozone cannot. Seal remaining odor sources before insulation and drywall go back.

Contents: inventory, triage, and chain of custody

Contents are a separate coverage on most policies and a separate workflow on the job:

• Inventory everything room by room before it moves: photo, description, quantity, and a tag or label number for each item or box. The inventory is the owner's claim and your chain of custody.
• Triage into three lists: restorable, non-restorable, and questionable. The non-restorable list, with description, quantity, approximate age, and condition, is what the adjuster uses to settle contents, so it is written carefully and the items are kept until the adjuster and owner have signed off. Throwing out a burned sofa before it is listed and photographed is throwing out the owner's money.
• Pack out restorable items to a climate-controlled, secure facility, with box manifests. High-value items, firearms, medications, and documents get special handling and the owner's acknowledgment.
• Clean by method: dry and wet hand cleaning for hard goods, ultrasonic and immersion for washable items, textile laundering with deodorization for clothing and soft goods, specialists for electronics and art, and freeze-drying for water-soaked documents and photographs. Deodorize in an ozone or hydroxyl chamber, never in the owner's home.
• Pack back after the rebuild is complete and the air is clean, with the owner checking the manifest and signing.

Going Deeper (Intermediate)

Fire scoping fails in the odor-only zone more than anywhere else. A bedroom two floors from a kitchen fire looks clean and smells like smoke because residue is in the carpet pad, the closet contents, the attic insulation above it, and the duct serving it. Scope it with a test clean and your nose, and include the insulation and the ductwork, or the owner will call in a month. Keep protein fires in mind: nearly invisible residue, a powerful odor, and a tendency to be underscoped by adjusters who see clean walls. The test-clean photos and a written odor log are your evidence.

Advanced / Pro-Level

Pros run a fire loss as three projects at once: a water job with its own drying log, a cleaning and deodorization job zoned room by room, and a contents job with its own inventory and invoice. They write the non-restorable list in a format the carrier can price, with enough description to establish replacement cost, which is why a detailed entry beats a vague one. They know that additional living expense pressure sets the pace on residential fires and that the carrier wants the odor problem solved before paint, so they sequence seal-and-verify before rebuild. And they document items that were cleaned and still failed, because an item is paid as a loss after a cleaning attempt only when the attempt is on paper.

Practice Challenge

A smoldering fire in a den full of upholstered furniture and electronics was out in an hour, but the house is coated in sticky residue and the smell is everywhere. The owner wants the walls painted next week. What is the sequence, and what do you tell the owner about the timeline? (Answer: this is wet smoke, so test clean first; HEPA vacuum and dry sponge, then wet wash with an alkaline cleaner, replace what fails the test such as textured ceilings and attic insulation, pack out and inventory contents with a non-restorable list, clean the ducts, deodorize with thermal fogging and hydroxyl, seal the odor sources, and only then paint; painting over sticky residue traps the odor and fails, so the paint date follows the clearance of the smell, not the calendar.)

In Practice

A restorer who zones the house, photographs test cleans, and runs contents on a signed inventory hands the adjuster a scope that is hard to argue with and gives the owner a home with no smell. A restorer who paints the fire room and calls it done gets the callback, the odor complaint, and a contents dispute.

Common Mistakes to Avoid

• Scoping only the rooms with visible soot
• Wet washing before the dry work, or washing top down and streaking the wall
• Discarding non-restorable contents before they are inventoried and photographed
• Painting or installing drywall before odor sources are cleaned and sealed
• Running the HVAC during cleaning and recoating the building

Takeaway: Fire restoration is decided by test cleaning, where every surface and every item is either cleanable, cleanable and then sealed, or replaced, and the contents inventory is where the claim is won or lost.

Educational content only — not design, engineering, industrial hygiene, legal, or insurance advice, and not a substitute for hands-on training, IICRC certification, or a licensed professional. Mold, asbestos, and lead work requires trained and, where required, licensed or certified people. Follow the current ANSI/IICRC S500, S520, and S700 standards as your company has adopted them, OSHA 29 CFR 1910 and 1926, the EPA rules that apply, the building codes and licensing laws as adopted in your jurisdiction, the policy and the carrier's program requirements on each claim, and the manufacturer's instructions for every meter, machine, and product you use.