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Wildfire Knowledge

How Wildfire Exposes Structures

Embers, heat and flame contact

Four exposure pathways

The main fire does not have to touch a home for it to ignite.

Embers, heat and connected fuels can threaten different parts of a structure at the same time.

Illustration showing a home exposed to wildfire through wind-driven embers, radiant heat, convective heat and direct flame contact
Understanding each pathway helps property owners combine vegetation management with appropriate home-hardening measures.

Wind-driven embers

Embers can travel far ahead of the main fire. They may collect in gutters, decks, vents, mulch, dry leaves and other receptive fuels near a structure.

Radiant heat

Radiant heat moves outward from flames and can preheat nearby materials. Greater separation and lower fuel intensity can reduce this exposure.

Convective heat

Hot gases and flame movement can carry heat upward and with the wind. Slopes and vegetation arrangement can influence this pathway.

Direct flame contact

Grass, brush, fences, decks, stored material or other connected fuels can provide a direct route for flames to reach a building.

Why the first five feet matter

Combustible material immediately next to a structure can allow small embers or flames to become a structure fire. Vegetation management near the building should be coordinated with home-hardening measures.

Practical priorities

  • Remove accumulated dead leaves and needles
  • Reduce combustible vegetation against walls and decks
  • Separate shrubs from windows, eaves and vents
  • Keep access routes visible and passable
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