United States / Build / Natural stone (Zone 0 hardscape)

Natural stone (Zone 0 hardscape)

This is a material class, not a wall or roof assembly listing.

Flagstone, cut stone, and similar inorganic stone are noncombustible groundcover and paving in the first five feet. It is a material class, not an OSFM-listed assembly.

Kind: material-class. Page reviewed 2026-08-23. JSON (CC BY 4.0)

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Specification notes

Zone 0 rules vary. California’s August 2026 Board of Forestry Zone 0 vote was not yet in force as of this verification.
Stone set on combustible sleepers or mixed with bark is not this class alone.

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Local force

The rule and every matching product for the United States

Requirement constraints (1)

Each table compares this product's documented attributes with one published requirement. The comparison does not change from place to place, so it is printed once.

Colorado CWRC immediate-zone hardscape undocumented
Field	Required	Documented value	State
Assembly role	Assembly role is one of mulch, edging	Not documented	undocumented
Material	Material is one of masonry, mineral, stone	Not documented	undocumented

Sources

Home Hardening — CAL FIRE (official). Accessed 2026-08-23.
Defensible Space — Oregon State Fire Marshal (official). Accessed 2026-08-23.
Wildfire Prepared Home — IBHS (standard-body). Accessed 2026-08-23.

Natural stone (Zone 0 hardscape). FireApproved. https://fireapproved.com/materials/natural-stone/. Last verified 2026-08-23.