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Chimney Standard
Anatomy

Hearth

The non-combustible floor at and in front of the fireplace opening, with required dimensions.

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All glossary terms

What is Hearth?

The hearth proper is beneath the firebox; the extension projects into the room. The extension's required depth and width are set by the opening size and the appliance listing, and they exist to catch embers. Reduced or removed during a remodel is a common and consequential finding.

Related terms:FireboxHearth Extension

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Other terms in the glossary

Creosote
Condensed wood-smoke residue on the flue wall, graded by stage — and the stage is the finding that matters.
NFPA 211
The consensus standard governing chimneys, fireplaces, vents and solid-fuel appliances.
Inspection Levels
Three defined scopes — and the standard specifies when each is required, not which you prefer.
Flue
The passage carrying combustion products out — one appliance, one flue, correctly sized.
Liner
The barrier between combustion products and the building structure. A breach takes the flue out of service.
Crown
The sloped masonry cap on top of the chimney — the surface that fails first and costs most.
15+
Years in the field
NFPA 211
Checklist
48h
Written report
< 2hr
Response
Ready when you are

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Emergency

24/7 Response

Chimney fire, storm hit, active leak, or a flue you're not sure about? We answer 7 AM to midnight and the assessment ends in a written safe-to-use verdict — including a do-not-use notice when the evidence supports one. After-hours dispatch runs subject to crew availability.

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