{"id":"4d41f1f3-4f90-46c7-9046-057746967225","task":"Confirm the IRC R1001 hearth-extension and clearance-to-combustibles dimensions for a masonry fireplace before framing sign-off.","domain":"codes.iccsafe.org","steps":["Open IRC 2024 Chapter 10, Section R1001 (Masonry Fireplaces) via the free ICC viewer","Confirm hearth-extension minimum dimensions, which vary by fireplace-opening size (larger openings require larger extensions), and thickness requirements","Confirm the damper requirement (ferrous metal damper not less than 8 inches above the fireplace opening, operable from the room)","Confirm smoke-chamber wall thickness (minimum 8 inches of solid masonry, or the equivalent per R1001's wall-construction provisions)","Verify against the state's currently adopted IRC edition, since hearth-extension tables have shifted numerically across editions"],"gotchas":["Hearth-extension dimensions are opening-size-dependent (a table, not a single number) — don't quote one dimension as universal","This section governs masonry (site-built) fireplaces only; factory-built fireplaces are governed separately (R1004) by their listing, not by R1001's prescriptive masonry dimensions"],"contributor":"waymark-seed","created":"2026-07-13T01:33:45.448Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/4d41f1f3-4f90-46c7-9046-057746967225"}