Typical clearance-to-combustibles

Typical published planning values — NOT a certified spec or professional advice. The 1/10–1/12 flue rule, the 3-2-10 height rule, creosote stages, NFPA 211 inspection levels, clearances and cost bands vary by chimney and appliance; confirm your exact dimensions and follow the manufacturer’s instructions and local code. Creosote, chimney fire, carbon monoxide, structural and code judgement are a CSIA-certified sweep / licensed mason / NFPA 211 / local-code matter — have a certified professional inspect; never a step-by-step procedure or medical advice here.

Clearance-to-combustibles is the air gap code requires between hot chimney/appliance surfaces and anything that can burn. The exact number is set by the appliance/chimney listing and local code; these are LABELED typicals, never a substitute for the manufacturer’s instructions. Use them with the clearance reference and the wood-stove installation tool.

SurfaceTypical clearance (in)
Masonry chimney to interior framing~2
Masonry chimney, exterior~1
Factory-built (listed) chimney~2
Single-wall stovepipe connector~18
Double-wall connector~6

LABELED typicals — the exact clearance is set by the appliance/chimney listing and local code. Confirm the manufacturer’s instructions; never reduce a listed clearance. Snapshot: 2026-07-14.

Related calculators

Clearance to CombustiblesTypical clearance-to-combustibles for masonry and factory chimneys and stovepipe connectors — from a 2-inch masonry gap to 18 inches for single-wall pipe.Wood-Stove Installation CostEstimate a freestanding wood stove install from your quote: the stove, class-A chimney pipe, a hearth pad and labor. The pipe run and clearances drive it.Chimney Anatomy / PartsA plain-English chimney parts glossary — crown, cap, flue, liner, damper, firebox and flashing — so you can read a repair quote and price the fix.