Top 10 Materials to Avoid in Wildfire Zones
When preparing your home for a wildfire, one of the most important steps is selecting the right building materials. Unfortunately, not all materials are created equal, and some can increase the vulnerability of your home during a wildfire. This blog will outline the top 10 materials to avoid in wildfire zones, helping you make informed choices when protecting your home.
When preparing your home for a wildfire, one of the most important steps is selecting the right building materials. Unfortunately, not all materials are created equal, and some can increase the vulnerability of your home during a wildfire. This blog will outline the top 10 materials to avoid in wildfire zones, helping you make informed choices when protecting your home.
Why Material Selection Matters in Wildfire Defense
The materials you choose for your home’s roof, siding, deck, and landscaping play a huge role in how well it can withstand the extreme conditions of a wildfire. Wildfires are unpredictable, and ember attacks, radiant heat, and direct flames are just a few of the risks to consider. Certain materials are highly flammable, which can contribute to the rapid spread of fire, putting your property—and potentially the whole neighborhood—at greater risk.
Let's explore the top 10 materials you should avoid when building or renovating your home in a wildfire zone.
1. Wood Shingles/Shakes
Wood shingles and shakes are classic roofing materials, but they are also one of the most flammable options. During a wildfire, embers can easily ignite wooden shingles, causing the fire to spread quickly. Even if a fire doesn’t directly touch the roof, the heat from nearby flames can still ignite wood shingles.
Recommendation: Opt for Class A fire-rated roofing materials like metal, clay tiles, or composite shingles.
2. Unrated Asphalt Shingles
Asphalt shingles are commonly used due to their cost-effectiveness, but they don’t provide adequate protection in a wildfire. Unrated asphalt shingles are particularly vulnerable to the heat and embers produced by wildfires, making them an unsafe choice for homes in fire-prone areas.
Recommendation: Choose Class A fire-rated composite shingles or metal roofing for better fire protection.
3. Vinyl Siding
Vinyl siding is an affordable option, but it is highly flammable and can melt or catch fire when exposed to heat. The melting vinyl can spread flames to your home’s interior, further damaging your property. It’s important to avoid vinyl siding, especially in Zone 0 and Zone 1.
Recommendation: Go for fiber cement board or metal siding, both of which are fire-resistant options.
4. Treated Wood (Untreated)
While treated wood can offer some level of protection against moisture and pests, it is still highly flammable and should be avoided in high-risk wildfire zones. When untreated, wood is even more susceptible to fire, and it can act as fuel during a wildfire, spreading flames rapidly.
Recommendation: Use fire-resistant materials like fiber cement board or fire-rated wood products.
5. Plastic or PVC Gutters
Plastic gutters may seem like a cost-effective solution, but they melt quickly and can easily catch fire when embers land on them. Plastic is one of the most flammable materials around your home, and it’s best to avoid it in favor of more fire-resistant options.
Recommendation: Install galvanized steel or aluminum gutters with metal gutter guards to prevent ember buildup.
6. Synthetic Turf
Synthetic turf might look appealing, but it is a non-natural material that can melt and catch fire quickly. The plastics and chemicals used in synthetic turf make it a significant fire hazard when exposed to intense heat.
Recommendation: Use natural, fire-resistant ground covers like succulents, grass, or wildflower meadows to maintain aesthetic appeal without compromising safety.
7. Plastic Window Frames
Plastic window frames, while lightweight and inexpensive, are highly flammable. When exposed to the intense heat of a wildfire, plastic window frames can melt or ignite, allowing embers to easily enter your home.
Recommendation: Choose metal or aluminum window frames that provide better protection from both heat and flames.
8. Wood Decking
Wooden decks are one of the most vulnerable areas of a home during a wildfire, as embers can easily settle underneath and ignite the wood. The flame can spread quickly, causing significant damage to your property and posing a risk to your entire structure.
Recommendation: Opt for fire-rated composite decking or metal decking to prevent fire spread from beneath the deck.
9. Traditional Wood Fencing
Wooden fences attached to your home can act as a bridge for fire to spread to your structure. The flammable nature of wood, combined with its ability to easily ignite from embers, makes traditional wood fencing a poor choice for wildfire defense.
Recommendation: Install metal, stone, or masonry fencing to create a fire-resistant barrier around your home.
10. Highly Flammable Mulch
Mulch is often used in landscaping but can be a major fire hazard, especially when it is made of wood chips or bark. These materials are highly flammable, and dry conditions can make them catch fire even more easily.
Recommendation: Replace wood mulch with gravel, stone, or decomposed granite. These non-combustible materials provide a beautiful, fire-safe landscaping solution.
Bonus: Full-Structure Fire Shielding
Even with the best materials in place, there are scenarios—like a neighboring home catching fire—where radiant heat and ember storms may overwhelm your defenses. That’s where full-structure fire shielding comes in.
Our solution is:
Waterless (no plumbing or sprinkler system needed)
Self-sufficient (no supervision required)
Rated to 3,000°F, with deployment designed to protect against ember storms and radiant heat
Final Thought:
While it’s important to use fire-resistant materials for every part of your home, it’s equally important to think about Zone 0 and Zone 1 when designing and landscaping your property. By avoiding highly flammable materials and focusing on non-combustible options, you can help ensure that your home is better protected from the dangers of wildfire.
The Zone Zero Fire Shield team hopes you find this information helpful.
Related Blogs in Our Series:
Best Fire-Resistant Building Materials for Zone 0 & Zone 1
When defending your home against wildfires, no area is more critical than the first 5 feet: Zone 0. This zone is where embers land, where flammable materials accumulate, and where ignition often begins. But the good news is that you don’t need to undertake a complete rebuild to make meaningful changes—you just need to choose the right fire-resistant materials.
When defending your home against wildfires, no area is more critical than the first 5 feet: Zone 0. This zone is where embers land, where flammable materials accumulate, and where ignition often begins. But the good news is that you don’t need to undertake a complete rebuild to make meaningful changes—you just need to choose the right fire-resistant materials.
In this blog, we’ll walk you through the best fire-resistant materials for key areas of your home’s exterior that are vulnerable to wildfire risks. Zone 0 and Zone 1 are key components of a broader wildfire defense strategy. Together with defensible space and other protective measures, the right materials can significantly increase your home’s chances of surviving a wildfire.
Let’s dive into the best fire-resistant options for your home.
1. Roofing: Go Class A or Better
Your roof is one of the largest and most exposed surfaces of your home. During a wildfire, it’s extremely vulnerable to ember attacks, which can easily ignite roofs made from combustible materials. For maximum protection, your roof should be made of materials that are Class A fire-rated, which provide the highest level of fire resistance.
Best Choices:
Composite Shingles (Class A): These are a cost-effective option that offers excellent fire resistance.
Clay or Concrete Tiles: Both materials are durable and naturally fire-resistant.
Standing Seam Metal Roofing: A fire-resistant and durable choice that provides long-lasting protection.
Avoid:
Wood Shakes: These are highly combustible and should be avoided in fire-prone areas.
Unrated Asphalt Shingles: While cheaper, these shingles lack sufficient fire resistance.
Source: CAL FIRE - Ready for Wildfire
2. Siding: Choose Noncombustible Materials
Siding is your home’s protective “skin,” shielding it from the elements and wildfires. During a wildfire, siding needs to withstand not only radiant heat but also the risk of embers landing and igniting the structure. Fire-resistant siding materials help protect your home by creating a barrier that keeps flames at bay.
Best Choices:
Fiber Cement Board (like HardiePlank): This material is highly fire-resistant, durable, and low-maintenance.
Metal Siding: Provides robust protection against fire and is long-lasting.
Three-Coat Stucco: A great option for homes in wildfire zones. It’s made of noncombustible materials and can resist heat.
Avoid:
Vinyl: This material can melt easily under intense heat, and it can also catch fire.
Untreated Wood: Wood is highly flammable and should be avoided in high-risk areas.
3. Gutters: Steel Over Plastic
Gutters play a key role in managing rainwater, but they can also be a major fire risk. Debris, leaves, and pine needles can collect in gutters, and when exposed to embers or radiant heat, these materials can easily catch fire. To prevent this, steel gutters with metal guards are the best choice.
Best Choices:
Aluminum or Galvanized Steel: These materials are fire-resistant and durable.
Metal Gutter Guards: These prevent the buildup of debris and provide an extra layer of defense against ember ignition.
Avoid:
Plastic or Vinyl Gutters: These are easily ignitable and melt under heat.
4. Soffits & Eaves: Seal Them Tight
Soffits and eaves are often overlooked but are key points of entry for flying embers. Unsealed gaps allow embers to travel straight into your attic or roof cavities. These spaces can catch fire quickly, especially in a wildfire.
Best Choices:
Boxed-In Eaves with Fiber Cement Soffit Board: This material is fire-resistant and helps seal the gaps that allow embers to enter.
Screened Vents with 1/8" Mesh or Intumescent Backing: These vent covers block embers from getting inside while still allowing airflow.
Source: Berkeley FireSafe Council
Avoid:
Unprotected or poorly sealed eaves and soffits.
5. Windows: Stronger Glass, Less Risk
Windows are another vulnerable part of your home during a wildfire. Heat from radiant heat or flying embers can cause windows to crack or shatter, letting embers enter your home. To reduce the risk, you’ll need to choose windows that are resistant to high temperatures and flying debris.
Best Choices:
Dual-Pane Tempered Glass Windows: These are stronger than standard glass and provide greater heat resistance.
Tempered Glass: This type of glass is designed to withstand higher temperatures without breaking, making it ideal for homes in wildfire zones.
Avoid:
Single-Pane Glass Windows: They shatter more easily and offer minimal protection against radiant heat.
Acrylic Windows: These materials can melt under extreme heat.
6. Doors: Solid Core and Fire-Rated
Your front, side, and garage doors need to be fire-resistant to prevent fire from entering your home. Fire-rated doors provide protection against heat and flames, and should be considered in your wildfire defense plan.
Best Choices:
Steel Doors: Steel is one of the best fire-resistant materials and helps prevent the spread of flames.
Fire-Rated Solid Wood or Fiberglass: These materials are designed to withstand heat and prevent fires from entering through doors.
7. Decking: Wildfire-Rated or Noncombustible
Decks are a common point of vulnerability during wildfires. Embers often settle under decks and can quickly ignite wooden surfaces. To protect your home, consider fire-rated decking materials.
Best Choices:
Fire-Rated Composite Decking: These materials provide a non-combustible, durable surface for outdoor spaces.
Metal Grating or Concrete Slab Construction: These options offer a more permanent, fire-resistant deck.
Avoid:
Wooden Decking: It’s highly combustible and can catch fire from underneath, allowing embers to ignite the deck and spread to your home.
8. Perimeter Ground Cover: Preventing Ember Ignition
Zone 0 isn’t just about the materials on your home; it also includes the ground around it. Creating a non-combustible perimeter helps prevent embers from landing near your home.
Best Choices:
Gravel: Gravel provides an excellent non-combustible ground cover that helps prevent fires from spreading.
Decomposed Granite: This material is both attractive and fire-resistant.
Concrete or Stone Pavers: These materials can create a solid, fireproof foundation around your home.
Avoid:
Bark Mulch: While often used in landscaping, bark mulch is highly flammable and should be avoided in high-risk areas.
Dry Grass: Grass can easily catch fire and should be kept well-maintained.
Bonus: Full-Structure Fire Shielding
Even with the best materials in place, there are scenarios—like a neighbor’s home catching fire—where radiant heat and ember storms may overwhelm your defenses. That’s where full-structure fire shielding comes in.
Our solution is:
Waterless (no plumbing or sprinkler system needed)
Self-sufficient (no supervision required)
Rated to 3,000°F, with deployment designed to protect against ember storms and radiant heat
Final Thought:
Fire-resistant building materials can’t stop every fire—but they give your home a fighting chance. Combined with defensible space and smart upgrades, these materials are one of the most important tools we have in the fight against wildfires.
The Zone Zero Fire Shield team hopes you find this information helpful.
Related Blogs in Our Series:
Creating a Fire-Safe Perimeter