Wildfires are now shaped by a combination of climatic extremes, fuel loading, and urban expansion that continues to push communities into the wildland–urban interface. Major wildfires in the Pacific Palisades and Altadena communities in 2025 demonstrated that the lessons of past fires are not merely academic; they are operational necessities that must guide us in preparing, responding, and rebuilding.
This article is a follow-up to the 2025 piece, “Fireproofing California: Enhancing Wildfire Resiliency in Construction,” and integrates lessons learned from last year’s events, placing foresight at the center of a technical, coordinated approach spanning the five phases of a wildfire event: reaction, response, remediation, recovery, and rebuilding.
Reaction: Lessons From the First Hours
The earliest hours of a wildfire event confirm a consistent truth: Effective reaction is not improvised; it is rehearsed. Technical lessons from prior fires show that poor access control and unclear responder zones can lead to unsafe overlap among residents, media, and emergency operations, even resulting in consequences for human life. Creating defined ingress and egress routes and establishing defensible perimeters around critical infrastructure have proven essential to safety.
Another key lesson is the importance of prescripted and scientifically grounded communication. Communities are increasingly influenced by real-time social media feeds, many of which amplify unverified reports and hysteria. Foresight now requires that emergency agencies, insurers, and engineering specialists maintain coordinated channels capable of rapid and accurate updates. Early messaging must focus on actionable protective steps supported by known fire behavior patterns, fuel conditions, and weather forecasts rather than speculation about fault or causation.
Response and Assessment: Seeing the Event at Scale
Large-scale wildfire damage rarely follows simple boundaries. Responders and engineers have observed that radiant heat effects, ember cast, and terraindriven fire movement often create irregular destruction patterns that require sophisticated mapping.
One of the biggest technical lessons is the importance of real-time situational awareness tools. High-resolution satellite imaging, LiDAR-based burn scar assessment, and thermal anomaly detection now play essential roles in understanding fire progression. These tools help distinguish between structures ignited by direct flame impingement and those ignited by ember intrusion (or even simply exposure to ambient fire and smoke conditions). This distinction directly affects later engineering and forensic evaluations.
Infrastructure failures also follow predictable technical patterns, such as the following:
• Electrical distribution equipment exposed to extreme heat may experience conductor annealing, insulator cracking, and transformer contamination.
• Water systems often lose pressure due to damaged pumping stations or melted service lines, which reduces hydrant effectiveness when it is needed most.
• Telecommunications networks may fail when fiber housings or aboveground repeaters undergo thermal degradation.
• Basic facilities such as traffic controls and emergency networks may be unavailable.
Residents’ immediate needs also place demands on the response framework. Without quick restoration of cellular service, banking access, or basic road connectivity, communities struggle to regain stability. A forward-looking response acknowledges these interdependencies and plans accordingly.
Environmental assessment has grown more complex in recent years. Burned structures can generate high concentrations of lead, arsenic, cadmium, asbestos fibers, and polycyclic aromatic hydrocarbons. These contaminants migrate through runoff or become airborne as dust if not properly contained. Technical lessons from past fires emphasize the necessity of early macro sampling of ash deposits, soil, and stormwater pathways, even before property-level testing begins.
Response: Identification of Damage With Better Tools and Planning
As fire movement stabilizes, damage assessment begins with an understanding that structures experience wildfire exposure in multiple ways. Ventilation systems, soffit failures, window breakage from heat stress, and ember intrusion into attic spaces are among the most common ignition pathways, even when a fire front never touches the structure.
A technically informed assessment includes:
• Thermal pattern analysis on exterior walls and roof assemblies.
• Evaluation of charring depth in structural lumber to determine whether members retain acceptable load capacity.
• Inspection of foundation systems, including post-tensioned slabs whose cables may experience relaxation or loss of prestress after heat exposure.
• Moisture intrusion mapping, since firefighting water can compromise shear walls, insulation, and building envelopes.
Advanced imagery tools now allow for rapid initial loss mapping without the need for immediate site entry. Synthetic Aperture Radar, multispectral imaging, and heat signature maps help insurers and engineers distinguish total losses from potentially salvageable structures, particularly when the determination of a total loss may be redefined based on the effects and outcomes of a wildfire. Precollected building data, including construction type and historical permitting, greatly accelerates this process.
Remediation: Applying Technical Lessons to Protect Health and Property
Wildfire remediation increasingly relies on industrial hygiene science. Damage that seems superficial often hides deeper contamination. Ash from burned structures may contain elevated levels of heavy metals and asbestos. Polycyclic aromatic hydrocarbons and dioxins can accumulate in porous building components, including stucco, masonry, and untreated wood.
Certified Industrial Hygienists now recommend:
• Quantitative wipe sampling of interior surfaces.
• Airborne particulate monitoring to determine whether HVAC systems circulated contaminants.
• Specific testing of attic dust, which often contains the highest concentrations of wildfire related toxins.
• Assessment of soil impact depths, which sometimes requires excavation beyond topsoil to remove persistent contaminants.
• Reliance on industry standards and the hygienists’ direction in confirming remediation methods.
Proactive demolition is another lesson that emerges repeatedly. When structures contain severe contamination or exhibit significant structural compromise, delayed demolition increases hazards and slows communitywide recovery. Foresight requires recognizing when mitigation is no longer viable.
Recovery: Managing Information as Carefully as Infrastructure
Recovery depends heavily on accurate and unified communication. Unverified claims about contaminants, building safety, or insurance coverage can spread quickly and undermine trust. Communities benefit when public agencies, private engineering damage firms, damage mitigation companies, and insurers work together to deliver consistent and vetted information. Dynamic capture of recovery intelligence must be recognized with engagement of comprehensive feedback loops.
Regulatory agencies also incorporate technical lessons during this stage. Updated guidance often reflects new understandings of fire spread mechanisms, ember vulnerability pathways, debris removal sequencing, and environmental clearance thresholds. Forward-looking recovery relies on continuously evolving standards rather than static approaches.
Another lesson from past events is the importance of early collaboration among engineers, contractors, and insurers. When technical findings are shared openly, recovery accelerates, disputes decrease, and rebuilding can begin sooner.
Rebuilding: Designing for the Future, Not the Past
Rebuilding translates technical knowledge into long-term resilience. Recent wildfire events have shown the effectiveness of several measures:
• Ember-resistant vents compliant with ASTM E2886 significantly reduce attic ignition.
• Noncombustible cladding materials such as fiber cement and exterior plaster assemblies perform far better than traditional wood siding.
• Tempered glass windows, especially multi-pane assemblies, withstand heat longer and reduce interior ignition risk.
• Closed eave construction limits entry pathways for embers.
• Class A roofing assemblies tested under ASTM E108 consistently show the highest survival rates.
Inspection protocols are also improving. Structural inspections now include char depth analysis, fastener integrity testing, evaluation of fireaffected reinforcing steel, and moisture mapping of damaged assemblies.
Rebuilding is not simply a return to prefire conditions. It is the intentional construction of a more resilient community using the best available knowledge of fire dynamics, material performance, and environmental risks.
Each wildfire event deepens our understanding of structural vulnerabilities, infrastructure interdependencies, and community needs. These lessons, combined with engineering foresight, shape a framework that strengthens protection before, during, and after wildfire events.
Reaction, response, remediation, recovery, and rebuilding are no longer isolated steps. They form a continuous technical process that drives communities toward greater safety and resilience.
By integrating lessons learned with proactive planning, we build more than what was lost. We build a safer future.
Patrick Kelahan is director, property loss consulting, NE region and expert – building consultant at MC Consultants. patrick. kelahan@mcconsultants.com
Vadim Veksler is complex claims manager – construction defect/corporate claims at Selective Insurance Company of America. vadim.veksler@selective.com