home survival in wildfire-prone areas - california...ember / firebrand radiant heat tennessee...
TRANSCRIPT
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Landscaping and home design for wildfire defense
Home Survival in Wildfire-Prone Areas
Yana ValachovicSteve Quarles
UC Cooperative ExtensionFebruary 25, 2019
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Take home points
➢ We don’t fight earthquakes, tornados, or
hurricanes. We adapt and build smarter.
➢ The majority of homes are lost from embers
➢ New building codes are helping
➢ Need to incentivize upgrades to existing
homes
➢ PRC 4290 defensible space
✓ Need a 5-foot noncombustible zone
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Ember / Firebrand
Radiant Heat
Tennessee Division of Forestry
Flame Contact
How a house burns from wildfire?
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We Know That …
Wind-blown embers are responsible for the majority of building ignitions
Angora Fire – South Lake Tahoe
USDA FS, R5-TP-015
Embers
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Structure Survival Priorities for Wildland Fire :
① Roof / Edge
② Vents
③ Vegetation/Defensible Space
④ Windows
⑤ Decks
⑥ Siding
Ember, radiant, and/or flame impingement exposures from near-home vegetation, other structures, and wildfire
Exposure from embers that may have been blown a mile or more. Embers can also ignite near-home vegetation and debris.
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Points of EntryRain gutter to roof edge Fence to houseRoof to wall
Ember entry via gable end vent Ember entry via under-eave vents
Insurance Institute for Business and Home Safety Photo: Tom Welch
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.
Defensible Space Reduced Fuel Zone
30 ft.
Defensible Space Zone
30 ft. to 100 ft.
Reduced Fuel Zone:
PRC 4291 Defensible Space Two zones: 0’- 30’ - Defensible Space Zone30’ - 100’ - Reduced Fuel Zone
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Ember damage
in Paradise
2018
Outside CushionPhotos: Y. Valachovic
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Carr Fire 2018: broken windows from burned shrubs near the house Photo Y. Valachovic
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Work from the house outDefensible space includes:
Zone 1: 0-5 feet “non-combustible zone”
Zone 2:5-30 feet “lean and green zone”
Zone 3: 30-100 feet or to the property line “reduced fuel zone”
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What does a Paradise Camp Fire survivor look like?
Photos: Y. Valachoic
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For more information visit:
• http://disastersafety.org/wpcontent/uploads/2017/03/WF_California_IBHS.pdf• https://disastersafety.org/ibhs/ibhs-nfpa-wildfire-research-fact-sheets/