FA Exhibit ZON-020. Bark and rubber mulch are combustible. Rock and decomposed granite are the five-foot path in the cited studies. After UNR SP-11-04 mulch combustibility study and IBHS Wildfire Prepared groundcover language. Illustrative — not a construction document. Verify with your building official. CC BY 4.0.
Technical review: Grayson Graham. Last verified 2026-08-23. JSON
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<img src="https://fireapproved.com/diagrams/zon-020-mulch-comparison.svg" alt="Side-by-side groundcover swatches of bark mulch, rubber mulch, rock, and decomposed granite, labeled for use inside versus outside the first five feet." />
