- Author: Pamela S Kan-Rice
Priorities include removing objects within five feet of a house, upgrading vents
Wildfire losses cost taxpayers and communities hundreds of billions of dollars each year, and preparing communities before a disaster occurs is the best way to avoid damage to homes and neighborhoods. Retrofitting existing homes can make communities safer while avoiding billions in disaster costs.
As Californians learn to live with wildfire, scientists encourage improving the structure and design of houses and other buildings to help them survive wildfire. A new report shows that even inexpensive changes can increase wildfire resistance.
“Retrofitting a Home for Wildfire Resistance” suggests that some of the most effective strategies to reduce the vulnerability of homes and neighborhoods to wildfire can be done affordably.
“This report is a practical tool that helps evaluate the relative costs and benefits of fire-hardening retrofits,” said Yana Valachovic, a University of California Cooperative Extension forest advisor, who reviewed the study. “These retrofits can substantially improve the odds that a home or building will withstand wildfire exposures to embers, radiant heat or flame contact.”
The report is co-authored by Kimiko Barrett, wildfire research and policy analyst for Headwaters Economics, a non-partisan research organization based in Bozeman, Montana, and Stephen L. Quarles, UC Cooperative Extension advisor emeritus, who has studied the vulnerability of the built environment to wildfire exposures and potential mitigation strategies.
In partnership with California's Department of Forestry and Fire Protection, or CAL FIRE, Barrett and Quarles examined the costs for improving the structure and design of existing homes to increase their wildfire resistance.
“This tool can also help homeowners build a budget and prioritize tasks that often feel overwhelming,” Valachovic said. “Everyone should prioritize removing combustible vegetation, mulch, and stored materials within the first five feet of a structure and upgrading vents to resist embers.”
Simple actions can reduce a home's vulnerability to wildfire
The report's conclusions are derived from a detailed examination of the latest available science on mitigation strategies and construction costs. The authors identified costs for retrofitting structures to meet and exceed California's building code (Chapter 7A) for wildfire resistance, but the general principles and conclusions can be applied in other states, adjusting for local economic and supply conditions.
For a typical 2,000-square-foot home in California, retrofitting costs can range from $2,000 to upwards of $100,000 for the highest level of protection.
“When we looked at the latest building techniques and cost data, we found some effective retrofitting strategies can be done for between $2,000 to $10,000,” said Barrett. “While the highest level of protection can cost more, it is often not necessary. Simple actions such as removing flammable materials from near the home and removing debris from the roof can be done at little to no cost.”
The authors also incorporated effective mitigation strategies that could reduce risk without requiring costly upgrades over the entire home, such as replacing siding only on the side of a home that is close to another building, such as neighbor's home or a detached garage, or replacing combustible deck boards next to the home with a noncombustible deck board or metal grate.
They also incorporated a systems approach, where the vulnerability of adjacent components are considered, and recommend steps such as placing noncombustible surfaces at the intersection between two components.
For example, Quarles said: “Adding a gutter cover and ensuring the adjacent edge of roof is not vulnerable by incorporating a metal drip edge and, if necessary, a noncombustible bird stop at the edge of the roof. Or, replacing a combustible deck board next to the house and, if necessary, adding metal flashing at the base of the exterior wall.”
Cost estimates in the report include those for upgrading a home's exterior walls, roof, deck, windows, doors, eaves, gutters and near-home landscaping – all areas likely to be exposed to embers, direct flames and radiant heat.
“The graphics detailing specific elements of the retrofitting process are very useful,” Valachovic said.
Charts, architectural renderings and a detailed appendix of cost estimates provide a basis for a general understanding of the methods and budgets that homeowners might consider when retrofitting their home for wildfire resistance.
Retrofitting for wildfire can make communities safer
Contractors and others seeking information about building wildfire-resistant homes can gain valuable insights from this analysis, along with retrofit costs generated by the California Wildfire Mitigation Program.
“This analysis demonstrates that investing in wildfire-resistant retrofitting for homes is a cost-effective strategy to protect communities that could save billions in disaster costs,” said Barrett. “As more people live in fire-prone areas, we must also take a closer look at retrofitting homes to be stronger and more durable.”
While the authors hope Californians use the information to protect their homes, people who work in construction, development, design and policy also can use the information to show that retrofitting homes for wildfire resistance is an effective way to protect communities.
This 58-page report received funding from CAL FIRE and the U.S. Forest Service and can be downloaded for free at https://headwaterseconomics.org/wp-content/uploads/2024/06/Wildfire_Retrofit_Report_20240624.pdf.
- Author: Michael Hsu
UCCE advisor outreaches to LGBTQ+ community, partners with Karuk Tribe in Northern California
Costumed as river creatures with papier mâché heads and dressed as the Army Corps of Engineers, Cleo Woelfle Hazard and a performance art group called The Water Underground dazzled the biennial Bay Delta Science Conference a few years ago.
Woelfle Hazard – then a Ph.D. student at the University of California, Berkeley – and his companions performed numbers from the film they were making, a “queer slapstick musical” about salmon migration. They soon got 150 scientists, engineers, resource managers and other conference attendees singing along to their songs.
“Meanwhile, some of my professors were in the audience, and they were saying, ‘Well, he's also a scientist, he doesn't just do this art stuff!'” recalled Woelfle Hazard, who started at the beginning of this year as the UC Cooperative Extension fire advisor for Humboldt and Del Norte counties.
Identifying as a “queer trans masculine person,” Woelfle Hazard has spent much of his career bringing together gender studies with his professional interests – a quest chronicled in his book “Underflows: Queer Trans Ecologies and River Justice.”
Prescribed burn training to help shape queer fire ecology
In his new role, Woelfle Hazard is organizing a prescribed burn training for people who are 2SLGBTQ+ (2S is a common abbreviation for Two-Spirit, which refers to people of Indigenous North American descent who identify as having both masculine and feminine qualities). The sessions, which began in the middle of Pride Month in June, will continue over three more weekends in the fall when participants conduct forest thinning and prescribed burns.
Inspired by the WTREX (Women-in-Fire TRaining EXchanges) burn trainings for women organized by UC ANR Fire Network Director Lenya Quinn-Davidson and her colleagues, Woelfle Hazard is excited to grow skills and foster connections within the LGBTQ+/Two-Spirit community.
“I try to be ‘out' in different contexts that are not particularly queer,” Woelfle Hazard said. “And the queer burn training is one way that I'm trying to increase the visibility of queer people in fire.”
He has been overwhelmed by interest in the training – with over 100 people already registered – and is looking forward to learning how subcultures within those diverse communities can contribute to a nascent “queer fire ecology.”
“I do social science and I do ecology, but my core field is feminist science and technology studies,” Woelfle Hazard explained, “which is a field where we're looking at the social context of science and who asks the questions and how the questions change if a Native person, or a Black person, or a queer person, or an immigrant is asking those questions.”
Working alongside Karuk Tribe on Klamath River floodplain restoration
The book “Underflows” also explores the intersectionality of queer theory with Indigenous conceptions of kinship and belonging – building on Woelfle Hazard's extensive experience working with tribal communities.
During his undergraduate years, Woelfle Hazard edited an anthology, “Dam Nation: Dispatches from the Water Underground” and contributed a chapter on tribal-led dam removal efforts, including those of the Karuk, Hoopa, Yurok, and Klamath Tribes in the Klamath Basin. In graduate school, he also participated in the UC Berkeley-Karuk Collaborative, started by UCCE specialist Jennifer Sowerwine and others.
Later in his career, as a faculty member at the University of Washington, Woelfle Hazard had an opportunity to work more directly with the Karuk Tribe. Seeking to bring students to the region for field sessions, he contacted Lisa Morehead-Hillman, who directed the Píkyav Field Institute, the educational wing of the Karuk Department of Natural Resources.
In return, she asked if there was a way her Karuk students could benefit from the experience as well – and Woelfle Hazard said he would be glad to host them in Seattle. “She had never had anyone from a university make that offer before, so that was really the foundation of building trust,” he said.
From there, Woelfle Hazard connected with Leaf Hillman, the founder of the Karuk Department of Natural Resources, and they co-developed a project to look at how reconnecting the Klamath River with its floodplain could restore ecological processes and eco-cultural practices such as basketry.
Working alongside Morehead-Hillman and University of Washington students Jocine Velasco and Ry Yahn, they produced a Storymap, patterned after the Karuk creation story of “Coyote's Journey,” recounting the historical impacts of mining, dams and fire suppression in the region. They are now working on a follow-up Storymap that will describe the tribe's plans to restore the floodplain and revitalize the Tishániik ceremonial site.
Navigating intersections of science, culture
Earlier this month, Woelfle Hazard brought climate scientists from the National Center for Atmospheric Research (NCAR) to Orleans in Humboldt County, where the Karuk Department of Natural Resources is located. NCAR scientists had developed a climate model that describes changes to the Klamath Basin under a variety of future fire regimes, and Woelfle Hazard presented on how well the model meets the needs of local communities.
“Our activity kind of broke their model, which they're pretty happy about, actually,” Woelfle Hazard said. “There's a lot of learning just about what is actually useful for the tribe and other organizations; we're working with the Western Klamath Restoration Partnership, which is a tribal-led partnership with the Forest Service and a number of NGOs in the Klamath Basin.”
As part of the NCAR Innovators project, which intentionally pairs social scientists with NCAR scientists, Woelfle Hazard also studied the researchers themselves, interviewing them about their experiences and looking at ways they can better partner with tribes and grassroots organizations.
“It's been a really complex project, putting together lots of different forms of knowledge – Karuk science, climate science, and I'm in the middle, trying to translate between them,” Woelfle Hazard said.
Native and Western ways of knowing. Social sciences and natural sciences. Fire and water. Artist and scientist. In work and in life, Woelfle Hazard has sought to deconstruct binaries that obscure more complicated realities – and blur those distinctions to illuminate greater truths.
During Pride Month and throughout the year, he said it's important to celebrate progress while also continuing to fight so all people can secure their basic rights and live their lives with dignity and purpose.
“Queer ecology is another frontline of the struggle; if you're a queer/trans/Two-Spirit person and you want to be a fish ecologist, you should be able to be a fish ecologist,” he said. “You shouldn't have to worry that people are going to be saying some stuff while you're out in the field getting into your wetsuit!
“This is work that we all have to do – dismantling these structures of racism, of sexism, of homophobia. And we have to do it all the time, every day.”
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First Forester TREX to be held June 3-6
California's first-ever Forester Prescribed Fire Training Exchange event focused on bringing together professional foresters, forest managers and fire practitioners will occur June 3-6 near Watsonville. The four-day event is being hosted by the Central Coast Prescribed Burn Association, which empowers the public to build a culture of good fire and supports private landowners in conducting prescribed burns in Monterey, San Benito and Santa Cruz counties.
There will be one burn conducted during the event, likely on June 4 or 5, which will be open for the public to observe.
Prescribed Fire Training Exchanges (TREXs) first came to Northern California in 2013, and have made a positive cultural shift concerning prescribed fire, within both regional fire services and the general public. These “good fire” TREX events have drawn significant attention, especially in the context of more severe wildfire seasons.
After months of cross-organizational planning, the four-day long training will be focused on exploring the connections between sustainable forest management, wildfire resilience, timber harvesting, prescribed fire, and will include a burn within a commercially harvested redwood forest. The TREX will provide experiential training opportunities to forest managers and planners to advance statewide knowledge of how to conduct prescribed fire in merchantable timber stands.
Along with the prescribed burn, the program will include lectures, local tours, and open discussions on how to incorporate fire into timber management, burn planning and timber harvest planning, pre- and post-fire considerations, and permitting mechanisms for fire and timber harvesting. Presentations will be given by local forestry consultants, University of California Agriculture and Natural Resources, CALFIRE and local fire practitioners.
The burn location will occur near Mount Madonna, on private land with access allowed for accompanied observation only. Be advised, while the ForesterTREX planning team works closely with theMonterey Bay Air Resources District to assure good smoke dispersal, smoke may be seen and be present in these areas during and after a burn. Please see the Central Coast Prescribed Burn Association webpage at calpba.org/centralcoastpba for updates close to the burn date.
Participants and partners include the Mount Madonna Center, members of the Amah Mutsun Tribal Band and the Esselen Tribe of Monterey County, University of California Agriculture and Natural Resources, Resource Conservation District of Monterey County, CALFIRE, local land trusts, scientists, ranchers, students, researchers, land managers and others. The Central Coast Prescribed Burn Association is currently funded via California Coastal Conservancy grants.
For more information or to join a group of observers, contact Barb Satink Wolfson, UC Cooperative Extension area fire advisor at bsatink@ucanr.edu.
- Author: Pamela S Kan-Rice
Wildfire, cultural and prescribed burns, plant flammability among topics covered
Interested in learning about some of the latest research in fire science and stewardship? Join the UC ANR Fire Network for a series of free lunchtime webinars to explore fire science topics with colleagues from across the globe.
This four-part webinar series will address fire in land management, plant flammability, fire history and management and forestry and fuel profiles.
Everyone is welcome to watch the Hot Topics in Fire Science and Stewardship Webinar Series.
Restoring Fire to Meadows and Other Cultural Landscapes
Presenters: Alice Lincoln-Cook, California Indian Basketweavers Association; Brian Peterson, Fire Forward
- May 29, noon–12:45 p.m. Pacific Time
- Register by May 29: https://bit.ly/3Qksc0J
How Can We Assess Plant Flammability?
Presenters: Jane Cawson, University of Melbourne; Max Moritz, UC Santa Barbara and UC ANR
- June 5, 3–3:45 p.m. Pacific Time
- Register by June 4: https://bit.ly/3WetrlA
Nuances in Fire History and Management: Lessons from Oregon Presenters: Andrew Merschel, U.S. Forest Service Pacific Northwest; Chris Dunn, Oregon State University
- June 12, noon–12:45 p.m. Pacific Time
- Register by June 11: https://bit.ly/44fMU7u
Forestry and Fuel Profiles
Presenters: Don Radcliffe, University of Washington; Eric Knapp, U.S. Forest Service Pacific Southwest
- July 17, noon–12:45 p.m. Pacific Time
- Register by July 16: https://bit.ly/4aTqI5Q
For more information, visit https://ucanr.edu/sites/fire/Home_430/Events.
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- Author: Grace Fruto, UC Davis
- Author: Trina Kleist, UC Davis
Wildflower displays threatened
Northwest of Los Angeles, springtime brings native wildflowers to bloom in the Santa Monica Mountains. These beauties provide food for insects, maintain healthy soil and filter water seeping into the ground – in addition to offering breathtaking displays of color.
They're also good at surviving after wildfire, having adapted to it through millennia. But new research shows wildflowers that usually would burst back after a blaze and a good rain are losing out to the long-standing, double threat of city smog and nonnative weeds.
A recent study led by Justin Valliere, assistant professor in the UC Davis Department of Plant Sciences, found that native wildflowers and other plants that typically flourish following a fire were, instead, replaced by invasive plants on land that received the kind of nitrogen contained in vehicle emissions.
“Many native plants in fire-prone areas rely on fire, and some are entirely dependent on it. Some are even most abundant after a fire,” said Valliere, a UC Cooperative Extension specialist in invasive weed and restoration ecology. “But we found that these fire-following species may be especially vulnerable to the combination of nitrogen pollution and invasive plants.”
That's part of the reason why native plants in these mountains have been declining.
Seeds – banked in the soil and waiting to sprout
The problem faced by native plants can be compared to a drawn-down bank account: Funds withdrawn are not being replaced.
It starts with fire, an important ecological process, Valliere said. Flames burn through plants on the surface and return their nutrients to the soil. Seeds sleeping in the ground wait for the next rain to sprout, then use those nutrients to grow.
“Plant diversity is often highest in growing seasons immediately after a site burns,” he said.
But invading plants have many advantages over native ones. They often sprout earlier, grow faster and create more seeds, all while tolerating drought.
“They're like cheaters,” Valliere said. “They don't follow the same rules.”
Nitrogen, too, is an important piece of every plant's nutrition. They all get a fertilizing boost from nitrogen that floats up in vehicle emissions and falls to the ground. But the invaders use nitrogen and other nutrients to grow faster, winning the race for water and sunlight. As a result, fewer native plants reach maturity, producing fewer seeds that keep their populations thriving.
When the bank balance reaches zero
The 2013 Springs Fire gave Valliere a unique opportunity to study the combined impacts of wildfire and extra nitrogen. He and colleagues from UC Riverside and the National Park Service created test plots in the Santa Monica Mountains where the fire had burned. Then, they added nitrogen to the soil to mimic the amount and type that LA's smog would deposit. Over the study's three years, native plants that typically would have flourished after wildfire instead declined even faster in the plots with added nitrogen.
Native seeds sprouted, but didn't flower. Over time, the soil's bank of seeds drew down.
“Each seed has one chance to flower and reproduce,” Valliere said. “If a seed grows and gets outcompeted, that seed has lost its chance to replenish the seed bank.”
Without the chance to replenish their bank account, native plants will die out, and the whole ecosystem will be thrown out of balance.
“There is inherent value in biodiversity,” Valliere said. “These invasive weeds could prevent the re-establishment of native shrubs after fire, sometimes forever altering the plant community.”
The loss of native plants can have cascading effects on the larger environment, he added. Problems can include the loss of native bees that feed on the flowers, and mudslides when rain makes hillsides unstable.
This problem is likely to repeat in similar areas where biodiversity is highest after wildfires – including parts of the Mediterranean basin, southern Africa and Australia. The addition of city smog “could have serious consequences for the biodiversity of fire-prone ecosystems worldwide,” Valliere warned.
Read the paper, “Nitrogen deposition suppresses ephemeral post-fire plant diversity,” by Justin Valliere, Irina Irvine and Edith Allen.
This article was first published on the UC Davis Department of Plant Sciences website.
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