Fire Administration (USFA) estimates more than 46 million residences in 70,000 communities throughout the United States are at risk for WUI fires ( USFA 2021). See the Compliance Tab for related codes and standards requirements, and criteria to meet national programs such as DOE’s Zero Energy Ready Home program, ENERGY STAR Single-Family New Homes, and Indoor airPLUS. Provide guidance to the homeowner for ongoing reducing, pruning, and thinning of vegetation and removal of debris in these zones to minimize potential wildfire fuel.At 60 or more feet from the home, canopies of mature trees should be at least 6 feet apart from each other. At 30 to 60 feet from the home, canopies of mature trees should be at least 12 feet apart from each other.

Use noncombustible or low-fire-risk ground covers to interrupt the potential path of an oncoming fire. Extended zone: In the area between 30 feet and 100 feet from the perimeter of the house, remove excess vegetation and leave in place or plant only vegetation that is selected and spaced to reduce the risk of wildfire.Canopies (branches) of mature trees should be at least 10 feet from the structure and at least 18 feet apart, or more on slopes. Employ noncombustible or low-fire-risk ground covers to interrupt the potential path of an oncoming fire. Intermediate zone: In the area between 5 feet and 30 feet from the perimeter of the house, employ noncombustible landscaping, remove excess vegetation, and leave in place or plant only vegetation that is selected and spaced to reduce the risk of wildfire.Follow best practices for selecting fire-resistant materials and constructing the home for fire-resistance. No tree branches should extend into this space. Immediate zone: Establish and maintain a noncombustible zone that includes the house and the area within a 5-foot perimeter around the house by removing vegetation and installing noncombustible ground cover materials such as rock, stone, gravel, or pavers.In high-risk fire hazard areas, such as at the wildland-urban interface (WUI), create defensible space between the house and potential wildfire fuels to protect the building from ignition during a wildfire event.

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