DEFENSIBLE SPACE

What is Defensible Space?

Defensible space refers to the area around a building or structure that is modified to reduce the risk of wildfire damage. It’s a fire safety concept used in areas that are prone to wildfires, like Alta Sierra. The idea is to create a buffer zone around a home or building that minimizes the fuel available for a fire to spread, giving firefighters a better chance to defend the structure and increasing the chances of the property surviving a fire.

Defensible space typically involves:

  1. Clearing vegetation: This means removing or trimming trees, shrubs, and grasses that could catch fire and spread it toward the building.

  2. Creating firebreaks: This involves creating gaps or cleared areas that act as barriers to slow or stop the spread of fire.

  3. Using fire-resistant plants and materials: Landscaping with plants that are less likely to catch fire can help reduce the risk.

  4. Maintaining defensible space: This includes regular maintenance, like mowing lawns, clearing dead plants, and trimming trees.

In Nevada County, there are specific guidelines and regulations that dictate the size and features of defensible space, based on our region's fire risk. The goal is to give enough space between potential fuel sources and the building to slow down or stop the spread of fire.

0-5 ZONE

  • Create a no-fuel, or low-fuel, zone 0-5 ft around your home
  • Clean roofs and gutters of dead leaves, all debris and needles that could catch embers. Maintain clean gutters.
  • Use hard surfaces, such as concrete or fire-resistant materials.
  • If planting, use widely spaced, non-woody, low herbaceous vegetation away from vents, windows, and interior corners.
  • Remove combustibles. Store firewood and flammable materials at least 30 ft away from your home, garage, or deck. Never store flammable materials under your deck.
  • Shrubs and trees are not recommended in this zone. Trim back overhanging branches 10ft from your roof.

INTERMEDIATE ZONE 5-30ft

  • Create vegetation “islands”, to break up continuous fuels. Remove ladder fuels.*
  • Get rid of leaf and needle debris from the yard. Keep grass under 8 in.
  • Keep vegetation well irrigated and free from debris.

EXTENDED ZONE 30-100ft

  • Create and maintain a minimum of 10 ft between the tops of trees. Remove ladder fuels.*
  • Remove dead trees and shrubs.
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HOME HARDENING - LANDSCAPING WITH WILDFIRE IN MIND

Under the right conditions, all plants will burn. However, there are plants you can select that are less prone to fire. When selecting fire-resistant plants, look for the following qualities: low volume of fuel, high-moisture content, and low amounts of oils and resins. Both the Sierra Nevada Alliance and the Redbud Chapter of the California Native Plant Society provide helpful resources for native, fire-resistant landscaping in Nevada County.

 

Flammable Plants

  • Bamboo
  • Cypress
  • Dry Annual Grasses
  • Eucalyptus
  • Feather Grasses
  • Fountain Grasses
  • Juniper
  • Manzanita
  • Monterey Pines
  • Oleander
  • Palms
  • Rosemary
  • Sagebrush
  • Scotch Broom
Plants that are flammable often have the following characteristics: 
  • contain volatile waxes, terpenes, or oils
  • gummy or resinous sap
  • loose, papery bark
To reduce the risk of wildfire, you can choose plants that are more fire-retardant, such as: 
  • Plants with high moisture content
  • Ground-hugging plants
  • Plants with low resin or oil content
  • Succulents
  • Leafy perennials
  • Sedges
  • Mat rushes