Prepare. Protect. Prodigy.Understanding the Wildland-Urban Interface
One in three American homes now sits where community meets wildland. Learn what the interface is, how homes actually ignite, and the zone-by-zone standard that changes the outcome.
≈90%
of destroyed homes ignite from embers or surface fire, not the flame front itself
15+ mi
the distance wind-driven embers have been documented traveling ahead of an extreme wildfire
60%+
of WUI ignition risk sits in the first five feet around the structure
Source: IBHS and NIST post-fire investigations; NFPA Firewise USA home-ignition-zone research.
The interface is a condition, not a place on a map.
You're in the WUI if fire in nearby vegetation can reach your home by flame, radiant heat, or wind-carried embers. That includes classic forest-edge properties, and it includes suburban streets with continuous fences, hedges and mulch beds connecting house to house.
The decisive mechanism is rarely a wall of flame: wind lofts burning fragments miles ahead of a fire, and they collect exactly where homes are receptive. Most losses begin quietly, at one of five predictable points, which means most losses are preventable at those same points.
Select a marker to see how each point ignites, and what to do about it.
FIG. 01 — The five predictable ignition points on a home elevation
Camp Fire, 2018
Paradise, California
18,800+ structures destroyed
Marshall Fire, 2021
Boulder County, Colorado
1,084 homes lost in suburban grassland, no forest
Lahaina Fire, 2023
Maui, Hawaii
2,200+ structures destroyed
Palisades & Eaton, 2025
Los Angeles, California
16,000+ structures, costliest U.S. wildfire event
Work outward from the walls, zone by zone, by the numbers.
The home ignition zone is measured from the structure, not from the property line. Each zone has a different job.
FIG. 02 — The three home ignition zones
Noncombustible. No exceptions.
- Gravel or stone, never bark mulch
- Nothing combustible against the walls
- Gutters clean, vents screened
Lean, clean and green.
- Irrigated island plantings, never continuous hedges
- Grass mowed under four inches
- 10 ft between shrub groups
Reduce and separate. Do not clear-cut.
- Crowns 10 ft or more apart
- Conifers limbed up 6 to 10 ft
- Ladder fuels removed
- Nothing combustible in the first five feet
- Gutters, valleys and under-deck cleaned seasonally
- Dead and dying material removed
- Emergency access kept clear
The structure is part of the fuel, harden every entry point.
Gutters
Metal guards plus a seasonal cleanout of gutters, valleys and roof field.
Vents
Ember-resistant rated mesh on every vent, per current WUI standards.
Roof
Class A assembly, kept clear of needle and leaf accumulation.
Decks
Deny the underside. Skirt, screen and keep the space beneath clean.
Walls & base
Six inches of noncombustible ground clearance at the base of every wall.
Glazing
Tempered dual-pane glass with metal screens on exposed elevations.
FIG. 03 — Wildfire readiness and a beautiful garden coexist by design
Start with a professional assessment.
Knowing what to look for is a trained discipline. Prodigy can assess your property's wildfire readiness against current WUI standards, walk the home ignition zone with you, and connect you with qualified home-hardening professionals.