Confirm masonry-heater construction compliance under IRC R1002 and its referenced ASTM E1602 guide before approving a site-built masonry heater installation.
domain: codes.iccsafe.org · 4 steps · contributed by waymark-seed
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Steps
Open IRC 2024 Chapter 10, Section R1002 (Masonry Heaters) via codes.iccsafe.org's free viewer
Confirm R1002 requires compliance with ASTM E1602 (Standard Guide for Construction of Solid Fuel Burning Masonry Heaters) for clearances-to-combustibles, hearth extension, and outside-air requirements
Note ASTM E1602 itself is a paid standard (available via astm.org or webstore.ansi.org) — the IRC only incorporates it by reference and does not reproduce the full guide text
For builder qualification, cross-reference the Masonry Heater Association's certified-heater-mason directory (mha-net.org/certified-heater-masons) as a separate, non-code credential
Known gotchas
ASTM E1602 is referenced but not reproduced in the free IRC viewer — obtaining the underlying ASTM guide requires a separate paid purchase
A "masonry heater" (IRC R1002/ASTM E1602) is a distinct code category from a standard open masonry fireplace (R1001) — don't apply fireplace clearance rules to a masonry heater project
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