Chimney inspection in Greater Seattle: which level you actually need

NFPA 211 devotes its Chapter 15 to the inspection of existing chimneys. It defines three inspection types — written Level I, Level II and Level III in the standard, and usually said as Level 1, 2 and 3 — and requires the scope, the areas examined, and how invasive the work gets to suit the conditions that prompted the inspection.

Level 1

The readily accessible parts of the chimney, its structure and its flue, plus the accessible parts of the connected appliance and the chimney connection. The technician confirms the flue is free of blockage and combustible deposits, looks for a continuous, undamaged liner through openings that already exist — a thimble, a cleanout, the flue termination — and checks the appliance, its connectors and its surroundings for damage, correct clearances and signs of an operating malfunction.

Level 2

Everything in a Level 1, plus every part of the chimney reachable without demolition, including runs inside accessible attics, crawl spaces and basements. The internal surfaces of the flue liners must be examined with image-scanning equipment — the video scan. Clearance to combustibles is verified everywhere it can be reached, and the liner material and flue size are evaluated against the appliances actually connected.

Level 3

Everything in a Level 1 and a Level 2, plus concealed areas reachable only by removing or destroying permanently attached parts of the chimney or building. It is limited to areas suspected of damage that the lower levels could not evaluate, and components come out only as necessary to reach them.

• Readily accessible. Quickly or easily reached: no tools, no removing a panel, door or covering, and no ladders. This is the Level 1 boundary.
• Accessible. May first require moving or removing a panel, door or covering, and may require ladders or common hand tools. This is the Level 2 boundary.
• Concealed. Reachable only by taking apart something permanently attached. Neither lower level permits destructive work, which is what makes a Level 3 a different kind of visit.

Under NFPA 211 the circumstance chooses the level. Most homes, most years, need a Level 1. A short list of events moves the minimum to a Level 2, and a much shorter list to a Level 3.

• Level 1 — nothing has changed. The annual inspection; a routine flue cleaning; or replacing a connected appliance with the same number of appliances of similar type, input rating and efficiency. It verifies the chimney is suitable to keep doing the same job with the same appliance.
• Level 2 — something changed, or something happened. Adding or removing a connected appliance, or swapping in one of dissimilar type, input rating or efficiency; before a flue is lined or relined; on the sale or transfer of the property; and after a building or chimney fire, a weather or seismic event, or another incident likely to have damaged the chimney.
• Level 3 — a hazard you cannot see. Where a fire, weather or seismic event is known to have caused damage and investigating it needs access to concealed areas, or where a hazard found at Level 1 or 2 cannot be fully evaluated without opening something up.

Two of those Level 2 triggers matter around Puget Sound more than people expect. A windstorm or an earthquake is named in the standard as an event that puts a chimney into Level 2 territory. And a Level 2 is called for before relining — the inspection comes first, the liner quote second, not the other way around.

Sale or transfer is the trigger that most often lands on a deadline. Note that a whole-house inspection is a different document: it normally looks at the chimney from the ground and the firebox, without scanning the flue liner. A Level 2 covers every flue in the chimney and the appliances connected to them, and if the scan finds something, the repair is a separate scope with its own schedule — so book it early.

The scan is a small camera on rods, run up or lowered down the flue, with the lens rotated to look at each component. It is not an upsell invented by the trade: NFPA 211 requires the internal surfaces of the flue liners to be examined with image-scanning equipment during a Level 2, and the written procedure published by the Chimney Safety Institute of America (CSIA) says the same. At Level 1 a scan is optional, and many companies include it anyway to document what they saw.

• Cracked flue tiles, collapsed tiles and tiles with large chunks missing — the classic evidence of thermal shock.
• Mortar joints between tiles that failed under heat, opening a path from the flue toward the framing around it.
• In a metal chimney, joint separation, warping, buckling or open seams — which frequently cannot be seen from the top or the bottom of the flue.
• Blockages and nesting material, a reason even a lightly used or gas-fired flue gets looked at.
• Whether a listed liner is the right material for the class of service, correctly sized, and installed as its manufacturer's instructions require.

The report is the product. An inspection you cannot show to a buyer, an insurer, a mason or your own memory next winter has not finished. CSIA's Level 2 procedure closes by telling the technician to discuss the findings with the client, hand over a copy, obtain the client's signature, and keep the report on file.

• The level actually completed and, if a higher level was requested but could not be finished, the reason.
• Which flues and connected appliances were inspected, and any area — attic, crawl space, roof — that could not be entered, with the reason.
• Photographs of the conditions described. We photograph the chimney before and after, from the same angles where that is practical.
• Findings sorted plainly into what is urgent, what can wait, and what does not need doing at all.
• Where repair is recommended, a written scope and price you approve before anything starts.

CSIA also states that most chimney fires go undetected — a slow-burning one lacks the air or fuel to be dramatic and often surfaces only at a later inspection, having reached temperatures that do the same damage. CSIA puts a masonry chimney fire at around 2000 degrees Fahrenheit, hot enough to melt mortar, crack tiles and collapse a liner. So these signs are worth an inspection even when nothing obvious happened.

• Creosote that looks puffy or honeycombed rather than flat.
• A warped damper, or warped metal where the connector meets the smoke chamber.
• A discolored or distorted rain cap, or a heat-damaged roof-mounted antenna.
• Creosote flakes and pieces on the roof or on the ground around the house.
• Roofing damaged by hot creosote, cracks in the exterior masonry, or evidence of smoke escaping through the mortar joints.

If you saw any of that, ask for the damaged sections and the creosote to be photographed before the flue is swept. CSIA's guidance is that such documentation helps an insurance adjuster process a repair claim — no promise about your policy, but the photographs cannot be recreated once the brush goes through.

Once a year. CSIA follows NFPA 211 and quotes it directly: chimneys, fireplaces and vents shall be inspected at least once a year for soundness, freedom from deposits, and correct clearances, with cleaning, maintenance and repairs done if necessary. The EPA gives the same annual advice for wood-burning appliances. It applies to lightly used flues, where animals nest and deterioration continues whether or not you light a fire, and to gas-fired flues, which can be blocked by debris or sized for older equipment than the furnace now attached.