By James Rodriguez, Central Chimney Service.
Every fall we hand homeowners a written inspection report, and the most common reaction is a polite nod followed by a phone call two days later asking what half of it means. That is a fair reaction. Inspection reports use trade shorthand, and nobody expects you to have memorized it. Here is how to read yours line by line, in plain English.
What a chimney inspection report should contain
A complete report covers the firebox, damper, smoke chamber, flue liner, crown, cap, flashing, exterior masonry, and the clearance between the chimney and anything combustible. If your report only covers “cleaned flue, all good,” it is not an inspection report, it is a receipt. Ask for the full document. Ours includes photos and, on a Level 2, video from inside the flue.
Level 1, Level 2, Level 3 — what the numbers mean
Those levels come from NFPA 211, the standard we work to. A Level 1 is the routine annual look at readily accessible parts. A Level 2 adds accessible attics, crawl spaces and basements plus a recorded camera scan of the flue interior, and the standard requires one whenever a home is sold or transferred, after a chimney fire or other operating malfunction, and any time the fuel, appliance or liner changes. A Level 3 involves opening up concealed areas and is rare — it happens when a Level 2 finds something that cannot be evaluated any other way. Our chimney inspection service page walks through each level in more detail.
The terms that trip people up
A few appear on nearly every report. Creosote is graded by stage — light and flaky is routine, hard and glazed is not. Spalling means the face of the brick is flaking off, which is a water problem, not a cosmetic one. Efflorescence is the white chalky residue that tells us moisture is traveling through the masonry. Parging refers to the smoothed mortar coating inside the smoke chamber. Clearance to combustibles is the gap between hot chimney and framing, and a note there is always worth a follow-up question.
Which findings are urgent and which can wait
Anything involving the liner, clearance to combustibles, or a blocked flue is a stop-using-it item until it is addressed. Those are the findings that put carbon monoxide in the house or heat against wood framing. A cracked crown, worn flashing, or a missing cap are important but seasonal — they cause damage over months, not overnight, so they can be scheduled. Cosmetic mortar wear on the exterior can genuinely wait a year. A good report says which bucket each item falls in. If yours does not, call and ask; we will tell you straight, and we quote the price up front rather than leaving you guessing.
What to do with the report after you get it
Keep it. Reports build a history, and the second and third years are when they start earning their keep — a hairline crown crack photographed last October and re-photographed this October tells us whether it is moving. If you are selling, the report is also the document a buyer asks for, and having a current one from an insured and bonded company saves an argument during inspection week. Homeowners across Oswego often ask us to pull last year’s file before we arrive, and it makes the visit faster.
Before you call anyone, it is worth knowing what you can check yourself — our DIY chimney care guide covers the safe homeowner-level checks, and our pricing page lists what each service runs. I have been doing this in the Plainfield area for 29 years and have never met a homeowner who regretted asking a question about their own chimney. Call (815) 305-5510 — we answer seven days a week, 7 AM to 7 PM.
Frequently asked questions about chimney inspection reports
How long should a chimney inspection take?
A thorough Level 1 usually runs 45 to 75 minutes. A Level 2 takes longer because it adds the camera scan of the flue and a look at accessible attic and basement runs.
Do I get photos with the report?
You should. Photos are what let you compare this year to last year, and they are the difference between a report you can act on and a list of words.
Is a Level 2 inspection required when selling a home?
NFPA 211 calls for a Level 2 on sale or transfer of a property. Many real estate contracts in the Chicago suburbs reference it, so it is worth scheduling early rather than during the inspection window.
What does stage three creosote mean on my report?
It means the deposit has hardened into a glazed layer. That grade does not come off with a standard sweep and needs a different treatment, so it is flagged as a priority item rather than routine cleaning.
My report says the liner has gaps. How serious is that?
Serious enough to stop using the fireplace until it is repaired. Gaps in the liner let heat and combustion gases reach framing and living space, which is exactly what the liner exists to prevent.
Can I get an inspection without a sweep?
Yes, though heavy buildup can hide defects from the camera. When that happens we say so, sweep first, then complete the inspection so the report reflects what is actually there.
How often do I need a chimney inspection?
Once a year. NFPA 211 sets the interval annually, checking for soundness, freedom from deposits, and correct clearances, regardless of how many fires you burned.
Does an inspection report cover my furnace flue too?
If the furnace vents into the same masonry chimney, yes, that flue is part of the inspection. Tell us up front what appliances are connected so nothing is missed.
Published October 17, 2026