Forensic Chimney Draft Analysis in Houston, TX
We test with HVAC running, range hood active, and exhaust fans on, because the failure only appears when the right systems combine.
Identify the Draft Failure That Survived Inspection, Cleaning, and Standard Diagnostic Testing
Your chimney is structurally sound. It was inspected. It was cleaned. And it still pushes smoke into the room.
When that happens, the chimney usually isn't the problem — the building is. Indoor air pressure can fall below outdoor pressure, and that pressure difference pulls air down the flue, directly opposing the draft your fireplace needs. A standard inspection measures the chimney. It doesn't measure the house working against it.
Forensic draft analysis measures the conditions a standard inspection never captures, isolates the exact combination of systems that triggers the failure, and delivers the finding in writing.
Persistent Draft Failure Investigated Across Multiple Visits and Conditions
A single visit captures one pressure state. If the failure doesn't exist in that state, the visit finds nothing — and you're told the chimney is fine.
That's why these failures get called "intermittent." They aren't random. They appear when the right systems run at the same time: the HVAC handler cycling, a range hood pulling hard, a bathroom fan running, and interior doors closed in a particular pattern. Change any one of those and the symptom disappears — which is exactly why it survives inspection.
Newer, tighter Houston construction makes this more common, not less. A well-sealed envelope has less unintentional make-up air available, so exhaust equipment pulls harder against the flue. Homes built after 2000 with central HVAC are the ones we see most often.
Multi-Visit, Multi-Condition Testing, Draft Failure Trigger Isolated and Documented
We don't test the chimney in isolation. We test the house as a system, under the conditions you actually live in.
HVAC running and off
Draft measured in both states. Handler operation alone can flip a working flue into reversal.
Range hood active and off
A high-capacity hood is often the single largest exhaust load in the house.
Exhaust fans on and off
Bath and utility fans are small individually and significant in combination.
Interior doors in combination
Door position changes how air moves between zones and can isolate the fireplace from make-up air.
Each combination is measured, not estimated. The goal is a repeatable trigger — the specific set of conditions under which the draft fails every time.
A Written Finding, Not an Opinion
You get a document you can act on — and hand to any contractor for a second opinion.
01
The triggering combination
Which building systems, running together, create the failure.
02
Pressure differential
The measured differential under each triggering condition, not a guess.
03
The actual cause
Whether it is a combustion air deficit, HVAC interference, or both.
04
Correction category
The class of fix the cause calls for, so the next step is clear.
When Forensic Analysis Is the Right Next Step
Not every smoking fireplace needs this. It's the right call when the ordinary answers have already been tried.
- ✓The chimney has been inspected and cleaned, and the draft failure continues.
- ✓The failure is inconsistent — some days fine, some days not.
- ✓You've received conflicting diagnoses from different contractors.
- ✓You live in a post-2000 home with a central HVAC system.
If your chimney hasn't been inspected yet, start there — a Tier 1 inspection is the right first step, and it's cheaper. Forensic analysis is for what's left when that comes back clean.
Forensic Draft Analysis Across Greater Houston
832 Home Service performs forensic draft analysis across Houston, Katy, Fulshear, Cinco Ranch, Sugar Land, Bellaire, West University Place, Pearland, Missouri City, The Woodlands, Spring, Cypress, Memorial, and the wider Greater Houston metro. CSIA certified, licensed and insured, serving Houston since 2010.
Frequently Asked Questions
Why does my chimney still smoke after inspection and cleaning?
When the chimney is structurally sound but still smokes into the room, the cause is often building pressure, not the chimney. Forensic draft analysis identifies the conditions standard inspection does not measure.
What is building depressurization?
It is the condition in which indoor air pressure falls below outdoor air pressure, caused by exhaust fans, HVAC imbalances, or tight construction. It pulls flue air downward, opposing normal chimney draft.
Why does multi-condition testing matter?
A single inspection captures one pressure state, and the failure may not exist in that state. We measure draft under HVAC running and off, range hood active and off, exhaust fans on and off, and interior doors in different combinations.
When should I call for forensic chimney draft analysis?
Call when the chimney has been inspected and cleaned yet the draft failure continues, when the failure is inconsistent, when you have received conflicting diagnoses, or when you live in a post-2000 home with a central HVAC system.
What does the written report deliver?
It identifies which building system combination creates the failure, the pressure differential under each triggering condition, whether the cause is combustion air deficit, HVAC interference, or both, and the correction category most appropriate for the cause.
Related Services
Other work Houston homeowners commonly pair with this service.
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