United States / Build / River rock (Zone 0 groundcover)

River rock (Zone 0 groundcover)

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

River rock is a noncombustible stone groundcover. Oregon’s State Fire Marshal names river rock, gravel, or pavers within five feet of the structure. 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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Findings that limit this record

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.
Do not mix river rock with bark or wood chips in the first five feet and call the bed noncombustible.

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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.

River rock (Zone 0 groundcover). FireApproved. https://fireapproved.com/materials/river-rock/. Last verified 2026-08-23.