There is a greater potential for house-to-house ignition.

There is a greater potential for house-to-house ignition.

• A. Interface
• B. Intermix
• C. Both
• D. None

Answer: (A)

When wildland fuels meet homes, there’s a continuous edge where flames and embers can move from the fire to multiple houses. This setup makes it easier for ignition to spread from one structure to neighboring ones along the edge, because there’s little to stop radiant heat or burning embers from reaching adjacent roofs and walls. The housing along the interface is typically closely spaced with similar vulnerabilities, so once one home catches fire, its neighbors are at high risk of ignition as well. In intermix areas, houses sit among vegetation with more variability in spacing and landscape features, which can interrupt or slow direct fire transfer between homes. Embers may ignite individual structures, but the direct path from one house to the next is less uniform, reducing the overall likelihood of rapid house-to-house spread. So, the greatest potential for house-to-house ignition occurs at the interface.

When wildland fuels meet homes, there’s a continuous edge where flames and embers can move from the fire to multiple houses. This setup makes it easier for ignition to spread from one structure to neighboring ones along the edge, because there’s little to stop radiant heat or burning embers from reaching adjacent roofs and walls. The housing along the interface is typically closely spaced with similar vulnerabilities, so once one home catches fire, its neighbors are at high risk of ignition as well. In intermix areas, houses sit among vegetation with more variability in spacing and landscape features, which can interrupt or slow direct fire transfer between homes. Embers may ignite individual structures, but the direct path from one house to the next is less uniform, reducing the overall likelihood of rapid house-to-house spread. So, the greatest potential for house-to-house ignition occurs at the interface.