Your house did not burn. It smells wrong, there is a light gray discoloration along the ceiling, and your insurer wants to know what exactly you are claiming.
Related from GPMI: Mold testing, independent and lab-based.
Smoke damage testing answers that. It establishes whether combustion residue is present, where, at what concentration, and whether it came from this fire.
We test. We do not clean. That separation is why the numbers hold up with an adjuster.
What smoke leaves behind
Fire produces 3 categories of contamination, and they behave differently.
Soot and particulate matter. Fine carbon particles from incomplete combustion. They travel on air currents, settle on horizontal surfaces, and penetrate porous surfaces that look clean.
Volatile organic compounds. Gases released as materials burn and as scorched materials continue to off-gas afterward. These are what you smell weeks later.
Chemical residue. Depending on what burned, soot can carry polycyclic aromatic hydrocarbons, heavy metals including lead, and in older structures polychlorinated biphenyls. Wildfire smoke that has passed through burned homes and vehicles is chemically different from a candle fire.
Carbon monoxide is a different hazard entirely, an acute one during a fire rather than a residue question afterward.
Why Southern California homes need this even when they did not burn
Wildfires push smoke miles beyond the burn perimeter.
Homes in Pasadena, Altadena, the Palisades corridor and across Los Angeles took heavy smoke exposure without a single flame touching the structure. Ash entered through vents, gaps and HVAC systems and settled in attics, ductwork and wall cavities.
That damage is invisible from the street, which is exactly why it gets disputed.
An accurate assessment is the difference between a paid claim and a denied one.
Visible signs, and why they mislead
Black discoloration around a register. A film on window glass. Lingering odors that return when the heat runs.
A visual inspection tells you where to look. It does not tell you what is there.
Clean-looking surfaces routinely test positive. Stained surfaces sometimes turn out to be ordinary dirt along an air path, or growth unrelated to the fire.
Neither result is available to the eye.
How the testing is done
Wipe sampling
A measured area is wiped with a solvent-moistened media and sent for lab testing. This is the workhorse method for surface soot testing, and it produces a number per unit area rather than an impression.
Tape lifts and particle identification
Microscopy distinguishes char, ash and soot from ordinary household dust, pollen and fibers.
That distinction matters more than any other result in the file. It is what separates fire residue from the dust that was always there.
Air sampling
Airborne smoke particles and particulate matter, measured against an outdoor control taken the same day.
Volatile organic compound sampling
Canisters or sorbent tubes, analyzed by gas chromatography and mass spectrometry, to identify specific combustion by products rather than a total.
Where we sample
Attics, the tops of door frames, inside HVAC systems and ductwork, behind wall plates, and the back sides of building materials. Smoke goes where air goes.
We also sample an unaffected area of the same property as an internal control, because an insurer will ask for one.
Laboratory analysis and what the report says
Samples go to accredited laboratories. Laboratory analysis reports concentration by compound or by particle type, with the detection limits stated.
Our report gives you the extent, the locations, the photographs tied to a floor plan, and a plain statement of what the results support and what they do not.
It states what was not sampled and why. A report claiming complete coverage of a property invites the question of how.
Why independence decides an insurance claim
Restoration companies test. Many do it competently. The problem is structural: the company measuring the contamination is quoting the cleanup, and insurance companies know it.
We never perform remediation, cleanup or restoration, and we take no fee from any company that does. When we report that contamination is present, we have nothing to gain from the finding.
That cuts the other way too. When a property tests clean, we say so, and it costs us nothing.
Effective remediation still needs a competent restoration contractor. We define the scope and you hire them independently, then we come back and confirm the work met it. A contractor confirming its own clearance is not verification.
When testing pays for itself
Test when:
- A fire occurred in or near the property, including a wildfire miles away.
- Your insurer disputes the extent of property damage, or has raised a total loss question.
- Odors persist after a cleaning that was supposed to resolve them.
- You are buying a property in a burn-affected area.
- Cleanup is finished and you need clearance before people return.
- Someone in the household has health problems that began after the fire.
Test before cleanup starts. Once surfaces are wiped, the evidence of what was there is gone, and the claim rests on your description of it.
Health risks, stated carefully
Soot particles are small enough to reach deep lung tissue, and smoke exposure is well established as an irritant that worsens asthma and other respiratory conditions.
Several combustion byproducts, including some polycyclic aromatic hydrocarbons, are classified as carcinogens at occupational doses.
What we can tell you is what is present and at what concentration. What that means for a specific person is a question for a physician, and we refer rather than opine.
Common questions
How do you prove smoke damage?
Documented sampling with chain of custody, laboratory analysis by an accredited facility, comparison against an unaffected control, and photographs tied to locations. Adjusters accept data. They rarely accept descriptions.
Can you live in a house with smoke damage?
Often yes, and habitability depends on the concentration, the affected areas and who lives there. That is a decision to make from test results rather than from odor.
Who performs smoke testing?
Independent environmental testing firms and industrial hygiene consultants. Restoration companies also offer it, with the conflict noted above.
Does testing detect what type of fire it was?
Particle identification and the chemical profile can indicate whether residue is consistent with a structure fire, a wildfire or ordinary combustion from a fireplace. That often settles a causation dispute.
How long do results take?
Typically a few business days after sampling, depending on the analyte and the laboratory’s service level.
Get the measurement before you clean
We provide independent smoke damage testing, soot testing, post-fire volatile organic compound testing and indoor air quality testing across Orange County, Los Angeles and Southern California.
Testing and assessment only. Never cleanup. Schedule an assessment and find out what is actually on your surfaces.
Where this fits
- What to do after water damage, the first 48 hours decide how big this gets, and what to document while you still can
- Post-fire volatile organic compound testing
Get an objective answer for your property
Accredited-lab sampling tells you the mold type and how much is present. Learn about mold testing.
- Independent, no remediation upsell
- Accredited-lab reporting
- ACAC & IICRC certified