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Building Upgrades to Further Protect Against Wildfire

Level Up!

After addressing the critical building prep, this group of exterior building improvements will give your structure an additional level of protection against flame exposure during a wildfire.

Wildfire Ready Business Guide

Know what steps will significantly improve the likelihood of your building’s survival.

1) For steep-slope roofs, enclose the underside of eaves and overhangs

Because of their geometry, radiant heat can build up in an open eave and ignite exposed materials. Flames from nearby fuels such as storage sheds, or vegetation can also ignite eaves.

  • Enclose eaves and overhangs on the underside by installing noncombustible or ignition-resistant soffits (e.g., a noncombustible siding material) or 2-inch or thicker lumber.
    • Remember, all soffit vents should be covered with 1/8-inch metal wire mesh.
1-Enclosed eaves

2) Cover gutters

Tree debris can collect in gutters providing fuel for embers to land on and ignite. When ignited, this debris could expose the fascia, roof, and attic to flames. While regularly cleaning gutters can also address this vulnerability, adding gutter covers reduces maintenance.

  • Install noncombustible gutter guards.
  • Ensure gutter guards are clear of tree debris.
Plastic guard over new dark grey plastic rain gutter on asphalt shingles roof and white color decorative plaster facade with brown wooden window with reflection on glass pane.

3) Move structures farther away from your building

Burning sheds, gazebos, and other structures increase the risk to a building because of the additional radiant heat, flames, and embers produced. Moving these accessory structures farther away better protects the building.

  • Move structures like sheds, gazebos, garbage containment, covered sitting areas, and other outbuildings at least 30 feet away from the building.
  • Ensure storage of combustible materials does not exceed 10 feet in height and is located at least 50 feet away from the building.
  • Store large quantities of combustible and flammable liquids at least 50 feet away from the building or in detached noncombustible buildings.
  • Move LP tanks at least 50 feet from the building and other structures on the property.
3-Move structures

4) Upgrade windows and doors

During a wildfire, windows and doors are susceptible to flames. Upgrading windows and doors can help keep flames from entering and igniting materials inside the building.

Windows

  • Replace all exterior single pane and annealed windows with tempered, multipaned glass or glass blocks, especially first floor windows on a multi-story business 

Doors

  • Upgrade exterior personnel doors to solid exterior doors that have a metal threshold and are constructed with a noncombustible or ignition-resistant material such as metal, fiberglass or solid hardwood.  
  • If you choose a door that includes glass, make sure it is made with tempered, multipaned glass.
4-Upgrade windows doors (Large)

5) Install noncombustible wall cladding

Radiant heat, embers, and flames can ignite combustible wall cladding. While the 6-inch vertical noncombustible zone protects against embers, replacing all combustible wall cladding provides greater protection against flames and radiant heat. Flames can spread across combustible wall claddings to reach other vulnerable areas—like windows, combustible signage and eaves on steep-slope roofs—and can begin a cascade of damage.

  • Replace combustible wall cladding including wood, wood-fiber, or vinyl with a noncombustible material that meets ASTEM E136 like concrete, brick, stucco, or stone veneer. 
  • Install noncombustible business name signage.  
5-Noncombustible wall cladding

6) Enclose under extruded exterior wall

The geometry of ground-level extruded walls (similar to bay windows on homes) traps heat which can ignite the building. Embers can also collect under these wall extrusions and ignite tree debris.

  • Enclose the area underneath a ground floor exterior wall extrusions with noncombustible cladding. 
Details of gray facade made of aluminum panels  with doors and windows on industrial building

7) Build fire-resistant building attachments (i.e., decks, ramps, patios, balconies)

Building attachments made from combustible material are vulnerable to ignition and can be a pathway to carry fire to your building. Eliminating the combustible material reduces this risk.

  • When designing a new building attachment, use metal joists and a fire-resistant walking surface such as fire-rated composite, aluminum, or lightweight concrete.
  • When retrofitting an existing building attachment, use noncombustible materials such as metal, stone veneer, or lightweight concrete to:
    • Ensure the bottom 6 inches of posts are noncombustible.
    • Select noncombustible hand railings especially in the first 5 feet attached to the building.
    • Choose a solid (no gap), noncombustible walking surface, including the stairs.
wire mesh metal ramp for wheelchairs, cyclists and mothers with prams. wooden planks and metal lattice fill the railing. gray, running slowly like a bridge. terrace of the building, handrail,

8) Remove back-to-back fencing

Back-to-back fences can trap debris between them, creating a susceptible fuel bed for embers to ignite both fences. The two fences together provide greater fuel for a more intense fire.

  • If you and your neighbor(s) have separate, parallel fences that are less than 5 feet apart, work with your neighbor to remove any sections of back-to-back fencing.
8-Remove back-to-back fences

9) Improve site access and fire-fighting capabilities

When there is an emergency you will want to make sure emergency services personnel can quickly locate your building to render services.

Provide proper building identification

  • Building identification should be provided at each vehicle access entrance and should be visible from both directions of travel. 
  • Street numbers should be at least 4 inches high, reflective, and applied on a contrasting background. 

Ensure proper emergency vehicle access

  • Entrances and driveways should be at least 12 feet wide with at least 13.5 feet of vertical clearance between the roadway and vegetation. 
  • The angle of approach and departure should be designed to allow for emergency vehicle access without damaging the equipment when entering or leaving the driveway. 

Access for gated properties

  • The gate should open inward and have an entrance at least 2 feet wider than the driveway.  
  • Locate gates at least 30 feet from a roadway intersection.  
  • If secured, the gate should have a key box or lock of a type approved by the local Authority Having Jurisdiction (AHJ). 

Fire hydrants

  • Place fire hydrants within 250–500 feet from the building and connect them to a reliable public or private water supply. 
  • If there are no fire hydrants within 500 feet of the building, contact the fire AHJ, or the local water department to find alternatives. 
The contrast between the bright yellow color and the surrounding concrete and buildings makes for a striking visual. This image could be used to represent themes such as safety, urban living, or infrastructure.

10) Work with your neighbors and community

Communities are growing and businesses are likely near suburban neighborhoods. This makes working with neighbors vital. No matter how well-prepared your property may be, it is not immune to fire if a neighboring business or neighborhood catches fire. What your neighbors have on their property will likely affect what will happen to yours.

  • Talk to your neighbors and other business owners about wildfire, what you’ve proactively done and how they can make improvements.  
  • Work with community-organized fire safe councils to help spread the message and prepare for wildfire at scale. 
A diverse group of happy community service volunteers stacking hands together outdoors in street

Critical Business Prep

These fundamental, critical steps serve as a starting point before progressing to the next set of actions. If you’re ready, proceed to Exterior Building Upgrades.

Exterior Building Upgrades

After addressing the critical building prep, this group of larger building improvements will give your structure additional levels of protection.

Wildfire-Resistant Landscape

When defensible space is thoughtfully created and well-maintained, it will increase the likelihood your building will survive a wildfire.

Business Evacuation Steps

When wildfire may threaten and time allows, follow these last-minute steps to protect your building.