By Daniel Watkins, Noble Chimney Sweepers.
A flashlight pointed up a flue from the firebox shows you the first few feet and a bright square of sky. That is genuinely useful — you can spot a heavy creosote layer or an obvious blockage. What it cannot show you is the other 20 to 30 feet, the offsets where the flue bends around framing, or the back side of every tile joint. Those are exactly the places where masonry chimneys fail. A camera scan puts an eye where a flashlight beam gives up.
What is a chimney video scan?
A chimney video scan is an interior flue inspection done with a camera on a rigid or semi-rigid pole, usually with a head that pivots so it can look sideways at the flue wall instead of only straight up. The sweep feeds it down from the top or up from the firebox, lighting the flue as it goes and recording the whole run. You watch it live, and you get to see the inside of your own chimney — which for most homeowners is the first time.
This is a tool, not a service tier. It is what we reach for when a visual inspection raises a question we cannot answer from the ends. If you are trying to sort out which scope of inspection you need, that is a separate topic covered in our post on chimney inspection levels; this one is about what the camera itself reveals.
Five things a scan finds that you cannot see otherwise
Open or missing mortar joints between flue tiles
Clay flue tiles are stacked with a thin mortar joint between them. Heat cycling, a past chimney fire, or settlement opens those joints, and once open they let flue gas and heat reach the surrounding brick and any wood framing touching it. From the firebox you can see one or two joints. A scan walks every joint in the stack, and gaps are unmistakable on camera — a dark line where there should be a filled seam.
Cracked, spalled, or displaced tiles
A vertical crack running through a tile, or a tile that has shifted sideways at an offset, is a direct path for heat and combustion gases into the chimney structure. Cracks like this are the most common thing we find in Romeoville homes where the fireplace burned hot for years without an annual sweep, and they are almost always above the reach of a flashlight.
Blockages at offsets and shelves
Where a flue jogs around a stairwell or a second-floor wall, it creates a ledge. Nesting material, a fallen brick, a lost cap, or a heavy creosote shelf collects there. From below it may look like the flue is clear because you are looking at a straight section; the blockage is around the bend.
Damage that tells you a chimney fire already happened
Puffy, honeycombed creosote and cracked tiles are the signature of a fire that ran up the flue, often without the homeowner realizing. A scan is how that gets confirmed rather than guessed.
Whether an existing liner was actually installed correctly
Stainless liners get installed poorly more often than people expect — not run the full height, not connected properly at the appliance, insulation bunched or missing. The camera settles it.
When a scan is worth doing
You do not need one every year. A camera scan earns its place when there is a specific question on the table:
- You are buying a house with a fireplace that has no service history.
- There has been a chimney fire, a lightning strike, an earthquake, or a car or tree impact to the structure.
- You are about to install a wood stove or insert and need to know the existing flue’s real condition first.
- There is water coming in, or a smell, and the visible parts look fine.
- A visual inspection turned up something ambiguous and the next step is either a scan or guesswork.
The honest counterpoint: if your chimney gets swept annually, burns seasoned wood, has a good cap, and shows no symptoms, an annual scan is not adding much. We would rather tell you that than sell you one. Our full chimney inspection service page explains what is included in a standard visit, and pricing for everything we do is published on the pricing page with the price up front.
What the scan does not do
A camera is a diagnostic, not a repair. It also has real limits worth knowing about. It cannot see through a heavy creosote coating — the flue has to be swept first or the scan is just video of soot. It cannot evaluate the exterior masonry, the crown, or the flashing, which are looked at from the roof and the ground. And it cannot assess clearance to combustible framing behind the masonry, which is a construction question, not a flue-interior one.
That is why a scan is scheduled after or alongside a sweep rather than instead of one. Sweeping first is what makes the footage meaningful. If the scan turns up open joints or cracked tiles, the fix is usually a stainless liner, which is covered under chimney relining, and we quote it with the video in front of you rather than asking you to take our word for it.
Scans in Romeoville
We cover Romeoville and the neighboring Will County communities 7 days a week, 7 AM to 7 PM. Noble Chimney Sweepers is owner-operated, certified, bonded and insured, and I have spent 14 years looking at the inside of these chimneys. If you want a scan, ask for it when you book and we will bring the camera to the appointment. Call (708) 432-5747 and you will get the price before the work starts.
Frequently asked questions
Do I need a video scan every year?
No. An annual sweep and visual inspection is the baseline for a chimney in normal service. A scan is for a specific question — a property purchase, a suspected fire, water intrusion, a new appliance install, or an ambiguous finding.
Does the chimney have to be swept before the scan?
Yes, in almost every case. A camera cannot see the tile surface through a creosote coating, so scanning a dirty flue produces footage of soot rather than an inspection.
Can the camera reach the whole flue?
On a typical straight or lightly offset residential flue, yes. Severe offsets and very tight liners can limit how far a rigid head travels, and we tell you where the camera stopped rather than implying we saw the whole run.
Do I get to see the footage?
You watch it live on the monitor while it happens. That is most of the value — you see the crack or the open joint yourself instead of being told about it.
What does a scan usually find in an older home?
Open mortar joints between flue tiles are the most common finding, followed by cracked tiles and debris collected on an offset shelf. In homes that have never been swept, a heavy creosote layer often has to be dealt with before the scan can say anything useful.
Will a scan tell me if my chimney is safe to use?
It answers the flue-interior half of that question, which is usually the decisive half. Exterior masonry, the crown, the flashing, and appliance connections are assessed separately during the same visit.
Is a scan the same thing as a Level 2 inspection?
They overlap but are not identical. Inspection levels describe the scope of what gets examined; the camera is one of the tools used to accomplish it. A scan is commonly part of the more thorough scope, not a replacement for it.
If the scan finds cracked tiles, does the chimney have to be rebuilt?
Usually not. A properly sized stainless steel liner restores a safe, continuous flue inside the existing masonry in most cases. Full rebuilds are for structural failure of the chimney itself, not for tile damage alone.
Published September 29, 2026