Application
Bridge & Overpass Wildfire Defense for Timber Infrastructure
Timber lagging, slope stabilization, and bridge framing are exposed to wildfire risk that can close evacuation routes and disrupt freight corridors for months. Wildfire Shield extends timber lifespan and keeps transportation infrastructure operational through fire events.
The Challenge
Timber transportation infrastructure is the weak link
Many highway overpasses, bridge approaches, and slope stabilization systems rely on timber lagging, framing, and pilings — and most of that timber is unprotected against the wildfire intensity now common in fire-prone regions.
When wildfire takes out a highway bridge or a timber retaining wall, evacuation routes close — and they stay closed for months. Freight corridors stall, communities lose access at the worst possible moment, and remediation costs climb fast.
DOTs, transit authorities, and bridge owners need a way to harden the timber components they already have — without rebuilding the structure in steel or concrete.
The Solution
Protect the timber. Keep the corridor open.
Wildfire Shield is a thermal-barrier coating that uses NanoTech's ICP™ technology to slow heat transfer into wood. Applied to timber lagging, bridge framing, and slope stabilization assemblies, it raises the effective ignition threshold under flame impingement and radiant heat — helping these structures survive fire events that would otherwise destroy them.
It bonds with creosote- and CCA-treated timber, plus legacy pentachlorophenol-treated lumber still in service across DOT and rail networks. Application can typically occur with minimal disruption to traffic, and the system is engineered to resist ignition across multiple fire seasons.
Why DOTs and bridge owners specify Wildfire Shield
Keeps corridors operational
Reduces the risk of fire-driven closures on evacuation routes, freight corridors, and rural arterials.
Survives multiple events
Engineered for repeat fire exposure — not consumed on first ignition.
Avoids replacement capital
Protect existing timber assets instead of rebuilding in steel or concrete.
Compatible with treated timber
Bonds with creosote-, CCA-, and penta-treated lumber common in DOT and rail.
Supports DOT documentation
Project-level specs, application guides, and substrate guidance for procurement and review.
TIME Best Invention recognized
Built on the ICP™ technology platform recognized by TIME Magazine.
Where Wildfire Shield protects transportation infrastructure
Timber lagging slope stabilization
Soldier-pile-and-lagging walls supporting cuts and embankments along DOT routes.
Highway overpass timber components
Treated wood beams, decking, and approach structures in fire-prone corridors.
Rural & forest road bridges
Wooden bridge framing, decking, and abutments on access roads through fire-prone landscapes.
Pedestrian & equestrian bridges
Wooden public bridges in trail systems and parks adjacent to highway right-of-way.
Timber crash & guard structures
Wooden barriers, posts, and signage substrates in fire-prone DOT corridors.
Erosion control & retaining systems
Timber retaining walls and erosion control structures along slopes and culverts.
Built for DOT and transportation authority specs
Resists Multiple
Re-Ignition
Non-Toxic
Toxicity
Treated Timber
Substrate
TIME Best Inventions 2024
Recognition
Brush · Spray · Roll
Application
Made in the USA
Origin
Wildfire Shield is part of NanoTech's ICP™ platform deployed in transportation, utility, and parks infrastructure programs, including deployment on state department-of-transportation timber lagging applications. Project teams receive substrate-specific guidance, technical documentation, and application support throughout the project lifecycle.
Bridge & overpass wildfire defense FAQs
Can Wildfire Shield be applied to creosote-treated timber lagging?
Yes. Wildfire Shield is compatible with treated timber assemblies common in DOT and rail infrastructure — including creosote- and CCA-treated timber, as well as legacy pentachlorophenol-treated lumber still in service (penta wood-preservative registrations were cancelled by EPA in 2022, but in-service inventory remains substantial). Surface preparation requirements depend on substrate condition and are confirmed during project assessment.
Will the coating affect the structural performance of timber lagging or bridge framing?
No. Wildfire Shield is a surface-applied protective coating that does not alter the structural properties of treated wood. It is designed to extend the service life of timber assets — not modify their structural performance.
How is the coating applied on in-service highway and bridge structures?
Wildfire Shield can typically be applied with minimal disruption to traffic using brush, roller, or low-volume spray methods. Project teams coordinate lane closures, traffic management, and crew safety with the asset owner during planning.
Is Wildfire Shield safe for use along watercourses and protected lands?
Yes. The coating is non-toxic with no hazardous off-gassing or runoff after cure, making it suitable for riparian zones, wetlands, and protected lands traversed by transportation infrastructure — subject to project-specific environmental review.
Does Wildfire Shield work after multiple fire events?
Yes. Unlike single-use intumescent products that consume themselves during first ignition, Wildfire Shield is engineered to resist ignition across multiple fire events. That's especially valuable for DOT and bridge assets expected to face fire exposure repeatedly across decades-long service lives.
Can Wildfire Shield be specified in DOT and transit RFPs?
NanoTech provides project-specific technical documentation, application guides, and substrate guidance suitable for inclusion in DOT and transit-authority RFPs. Reach out to coordinate spec packages for upcoming bridge resilience and timber lagging projects.