Most people imagine a wildfire as a wall of fire approaching their home. However, that is not how most houses actually catch fire. Embers that are carried by the wind and are small burning pieces of wood and plants land on a structure or inside it long before any flames, are responsible for most homes catching fire during a wildfire. Embers can be blown more than two miles in front of a wildfire and if your home has small openings, surfaces that are combustible, or the wrong areas of debris accumulation, those embers don’t need any flames to destroy your house.
Here are five places most homeowners have not thought to check.
1. Soffit and eave vents
Eave vents are there to regulate your attic. Until a wildfire, when they actually do something else: they let embers inside. Wind pressure during a fire event turns your attic into an intake to the inferno outside. Embers, about the size of a quarter, ignite most home fires. They blow in through those vents, land in your attic, and burn your house down.
There’s lots of wood framing and insulation to fuel the flames. But you won’t notice the fire until it’s too late. Embers are effectively designed to take a building down from the inside. It’s the same problem that’s plagued home construction since Roman times, and the same elegant solution that’s been around about as long: a screen on the vent. Turns out screens block wind-driven embers, too.
The answer is relatively easy. Replace your eave vents, or retrofit the ones you have, with no larger than 1/8-inch mesh. That should keep most embers out. You can also consider fire-rated vent products that prevent your home from vulnerable elements like wind-driven embers without a total remodel. It’s one of the highest fixes for the least investment.
2. The zero-to-five foot perimeter
Embers ignite eight out of ten homes during wildfires and can blow half a mile ahead of a fire front. They can work through vents or windows or melt vinyl siding. They can ignite a woodpile or a welcome mat. The good news: It is not difficult or expensive to make a house ember-resistant. Start by imagining burning debris from a house half a mile away landing on your driveway. It happens. Clear your rain gutters. Put in gutter guards. Fix those roof shingles that are missing or broken. Seal the soffits. Put in 1/8-inch mesh screen behind the attic vents and do the same for under-floor vents. Rake. Keep the mulch and the wood chips and the leaves away. All doable.
3. Fences and secondary structures
A wooden fence that is directly attached to your house is a wick. Ground-level fire can travel the full length of a fenceline and reach your siding or eaves and then ignite your house without anyone ever seeing a flame reaching the structure. This scenario isn’t uncommon where fences run along a property boundary (acting as a wick and funnel), turn and head directly for a wildland, and connect directly to the building.
Combustible decks do the same thing. A deck made from standard lumber, butted up to the house, provides a wick (similar to funneling) for fire starting at or under the deck to reach your house. Attached sheds and storage structures also provide a solid amount of direct contact for fire to affect the building. Non-combustible decking materials or a purposeful break in the attached fenceline – even a short section in which a metal gate is attached to the house – can break that pathway. Nonattached storage sheds should simply be far enough away that any fire that affects them can’t affect your building.
4. Garage door gaps and weatherstripping
People tend to forget about their garage as a vulnerable entry point as embers can easily enter through a standard garage door with small gaps along the bottom and sides. However, if the weatherstripping has degraded or warped, those gaps get bigger. Inspect and replace worn seals annually if you’re in a fire-prone area.
Consider upgrading to ember-resistant weatherstripping specifically designed for wildfire zones, which uses tighter seals and fire-retardant materials. Additionally, if your garage stores flammable materials like paint, gasoline, or propane tanks, these items become exponentially more dangerous when embers find their way inside. Creating a fire-safe storage plan for such materials—ideally in a separate outbuilding or exterior shed—can prevent your garage from becoming an ignition point that threatens your entire home.
5. Re-entrant corners on the roof
This one is architectural. Wherever your roofline forms an interior corner – an L-shaped house is a good example – wind naturally pushes debris into that angle. Leaves, pine needles, and dry plant material collect there, and those corners become ember catch basins during any wind event, let alone a wildfire.
Cleaning gutters is common advice, but cleaning re-entrant corners specifically is less often mentioned. These areas are harder to access and easy to forget, but they carry the same risk as a debris-filled gutter. Any dry organic material on your roof is potential fuel. The goal is a roof surface that gives an ember nothing to hold onto.
Thinking like a fire investigator
Homes that make it through wildfires are not undoubtedly newer or better-built – they’re frequently the ones where the little things were done. Embers don’t need an invitation. They just need a gap, a surface to land on, or a pile of debris to ignite. Looking at your exterior with that perspective and eliminating those points of ember entry and ignition is more important than almost any other home fire safety step you could take.
