Have you heard about fire-resistant roofing material? By now, you should have, especially if you live in areas susceptible to wildfires, particularly across California and the western US. Homeowners can’t ignore this topic because, tragically, we have seen that droughts causing fires across California can be an actual danger to homes!
The roofing industry is in a rush to offer homeowners a real solution to fire dangers, so selecting roofing materials transcends mere aesthetics, becoming a fundamental aspect of safeguarding homes and lives. During a wildfire, the roof presents a primary point of vulnerability. Airborne embers, carried by strong winds, can easily land on a roof and initiate a devastating fire if the material is combustible.
Why This Blog Is a Must-Read on Fire-Resistant Roofing Materials
iRoofing is a leading roofing software company. Since 2011, we have worked with tens of thousands of roofing businesses, including contractors, manufacturers, and distributors nationwide and around the world. This extensive network gives us a unique vantage point, allowing us to gather and verify information directly from industry professionals, insurance companies, and insurance adjusters. The insights shared in this guide are not just theoretical; they are grounded in the real-world experiences and expertise of those working with roofing materials daily.
We are committed to providing straightforward, reliable information to help you make informed decisions about protecting your home. Our analysis is backed by direct communication with roofing experts, ensuring the accuracy and relevance of the details we present. We also provide roof measurement takeoffs you can order for roofing professionals, insurance adjusters, property managers, and property owners when replacing roofs after disasters.
So, if you need to learn more about fire-resistant roofing options, keep reading. We have gathered straightforward information. Most importantly, we talked with roofing experts, and here, we share their insight. We Are a Trusted Source for Fire-Resistant Roofing Information.
Understanding Fire Ratings – Fire-Resistant Roofing
Roofing materials are classified based on their fire resistance:
- Class A-rated roofing materials offer the highest level of fire protection. These materials can withstand severe fire exposure, including intense heat and direct flame contact, for a significant period. They exhibit excellent resistance to surface flame spread and do not contribute to the fire’s intensity. Common examples of Class A roofing materials include concrete and clay tiles, slate, fiberglass asphalt shingles with specific fire-resistant backings, and certain metal roofing systems. Due to their superior fire resistance, Class A materials are often mandated for use in areas with a high risk of wildfires or buildings with stringent fire safety requirements.
- Class B-rated roofing materials provide a moderate level of fire resistance. While not as robust as Class A materials, they can still withstand moderate fire exposure and offer a reasonable degree of protection against flame spread. They are generally less expensive than Class A options and are suitable for many residential and commercial applications where fire risk is not considered extreme. Examples of Class B roofing materials include some types of asphalt shingles and treated wood shakes.
- Class C-rated roofing materials offer a light level of fire resistance. They are designed to withstand limited fire exposure for a short duration and provide some protection against minor flame spread under specific test conditions. These materials are typically the least expensive among the rated options and are often used in areas with a low fire risk or for specific aesthetic purposes where building codes permit. Examples of Class C roofing materials include wood shakes and shingles that have undergone fire-retardant treatment.
- Unrated roofing materials have not been tested for fire resistance and therefore have no official fire rating. These materials are often highly combustible and can contribute significantly to a fire’s rapid spread and intensity. The use of unrated roofing materials is generally discouraged or prohibited in most building codes due to the increased safety risks they pose. Examples of unrated materials include untreated wood shakes or some older, less regulated roofing products. It is crucial to verify the fire rating of any roofing material before installation to ensure compliance with local building codes and to maximize the safety of the building and its occupants.
Worried about fire risks in your area?
Class A materials are strongly recommended for areas susceptible to wildfires and are the fire-smart choice. “Knowing which materials offer the best protection is only half the battle — knowing what’s on your roof is the next step.”
So… what should you do next? → Get a professional roof report to see how protected your home really is.
All the Layers of a Roof Can be Fire-Resistant
Even homes constructed with wood can significantly enhance fire safety by implementing a fire-resistant roofing system. The number of protective roof layers can be customized to meet specific needs and desired levels of protection.
These specialized materials are designed to inhibit the spread of flames, resist ignition, and provide a crucial barrier against intense heat. By incorporating such systems, homeowners and building owners can gain valuable time during a fire, allowing for safer evacuation and minimizing structural damage.
1. Roof Deck (Base Layer)
Material: Fire-retardant-treated plywood or non-combustible concrete board.
Purpose: Forms the structural base. Using treated wood or a non-combustible material prevents the fire from igniting the roof from below or spreading internally.
2. Underlayment (Fire Barrier Sheet)
Material: Class A fire-rated underlayment (e.g., fiberglass-reinforced or self-adhering fire-resistant membrane).
Purpose: Acts as a secondary fire barrier. Prevents flames from reaching the deck if the outer roofing is compromised.
3. Fire-Resistant Insulation (Optional Layer)
Material: Mineral wool or fiberglass batt insulation.
Purpose: Adds thermal resistance and slows down heat transfer. Non-combustible insulation helps delay ignition and internal damage.
4. Roof Covering (Top Layer)
Purpose: The outermost layer provides the first line of defense. Class A materials resist flame spread and withstand embers or radiant heat exposure.
5. Flashing and Vents
Material: Metal (non-combustible, rust-resistant).
Purpose: Seals edges and penetrations. Properly installed flashing prevents fire entry points while maintaining the integrity of roof features.
6. Drip Edge and Eaves Protection
Material: Metal drip edge, ember-resistant venting.
Purpose: Embers often enter attics through gaps. Using ember-resistant designs and metal edges protects vulnerable entry points.
While this overview briefly explains fire-resistant roofing principles and the benefits of incorporating layered protective materials, don’t wait for an emergency to find out your roof isn’t up to code.
Our detailed report can help you strategize the installation of a new roof with Class A fire rating protection, materials, and condition, so you can make a wise decision and keep your family safe!
1. Metal Roofing
- Fire Rating: Class A.
- Advantages: Non-combustible, lightweight, durable, and reflects heat.
- Considerations: Higher upfront cost, but low maintenance and long lifespan.
Metal Roofing Considerations
Naturally Non-Combustible- Metal roofing is inherently fire-resistant and will not ignite or fuel a fire. This makes it one of the top choices for homes in wildfire-prone areas.
Installation Is Everything- Roofers stress that fire resistance depends heavily on proper installation. Even the best materials can fail if installed incorrectly. Common issues include:
- Gaps or openings that allow embers to reach flammable materials underneath.
- Improper sealing of seams and penetrations.
- Skipping fire-rated underlayments.
Secure Fastening is Critical- If panels are not properly fastened, they can detach during a fire due to heat or wind, exposing the structure beneath and compromising the fire barrier. Roofers emphasize:
- Using correct attachment techniques.
- Following the manufacturer’s guidelines precisely.
Building Codes and Manufacturer Specs Matter- Professionals highlight the importance of:
- Following local building codes.
- Using fire-rated underlayment materials.
- Ensuring tight seals around vents, edges, and ridges to block ember entry.
Effective Barrier When Done Right- When appropriately installed, a metal roof can serve as an exceptional fire-resistant shield, protecting the building and its occupants during wildfires or urban fires.
Roofing professionals’ insights on Metal Roofing materials:
“Metal won’t burn, but it transfers heat so effectively that the metal requires a fire-resistant substrate to get a Class A fire rating.“
“We have a metal roof with polyiso insulation, cement board siding, and spark-proof vents. It would be hard for a stray spark to catch us on fire.“
2. Asphalt Fiberglass Composition Shingles
- Fire Rating: Class A (when installed with proper underlayment).
- Advantages: Affordable and widely available.
- Considerations: Lifespan of 20–30 years; requires regular maintenance.
Asphalt Fiberglass Composition Shingles Considerations
Fire Rating Matters – Many roofers mention the importance of Class A fire-rated shingles, which most fiberglass asphalt shingles qualify for. This rating means they can:
- Withstand severe exposure to fire.
- Resist flame spread.
- Offer protection against embers (a big issue in wildfires). Roofers in wildfire-prone areas like California or Colorado often recommend fiberglass shingles specifically because they meet or exceed Class A standards without needing additional fire barriers underneath, unlike older organic-based shingles.
Fiberglass Core Advantage- Roofers will note that fiberglass shingles perform better than organic-mat shingles in fire tests. The fiberglass mat doesn’t ignite as easily and has lower fuel content, which:
- Slows fire progression.
- It prevents the shingles from curling or catching fire quickly, making them more appealing in areas with wildfire risks.
Cost vs. Fire Safety Balance- Contractors often highlight how affordable fiberglass shingles are compared to metal, tile, or slate—all of which are more fire-resistant and far more expensive. For budget-conscious homeowners, fiberglass shingles are often pitched as the best balance between cost, performance, and safety.
Installation and Maintenance Still Matter- Some roofers caution that poor installation or debris buildup (like dry leaves or pine needles) can reduce fire safety even with fire-rated shingles. They emphasize:
- Keeping the roof clean.
- Installing fire-resistant underlayments.
- Sealing gaps where embers could enter.
Roofing professionals’ insights on Asphalt Fiberglass Composition Shingles materials:
“We consistently educate and advise homeowners that no asphalt shingle is 100% fireproof. In high heat, even Class A shingles will eventually degrade. However, they buy time for homeowners and firefighters during a fire event.”
“We explain to homeowners that fiberglass shingles have a better Class A rating. This is backed up by flame spread rating based on UL 790 and ASTM E 108 fire test methods.”
“If homeowners are more interested in their homes’ aesthetics, then the second option would be asphalt fiberglass composition shingles, but we clearly inform them that they are less fire resistant than metal or concrete tiles IMO.”
3. Clay and Concrete Tiles
- Fire Rating: Class A.
- Advantages: Non-combustible and aesthetically pleasing.
- Considerations: Heavy; may require additional structural support.
Clay and Concrete Tiles Considerations
Naturally Fire-Resistant Roofing Materials- Both clay and concrete tiles are non-combustible, meaning they won’t catch fire or fuel flames. This makes them a go-to choice for fire-prone areas like Southern California. Roofers often cite them as having Class A fire ratings, the highest available.
Heavyweight Protection– Contractors often emphasize the thickness and density of these materials, which:
- Help block heat penetration.
- Reduce the chance of underlying materials igniting.
- Offer more time for firefighting efforts during a blaze.
Installation Must Be Done Carefully- Despite the material being fireproof, installation details can compromise the fire resistance. Roofers warn about:
- Gaps under the tiles that allow embers to enter and ignite underlayment or attic spaces.
- The importance of fire-rated underlayment and proper flashing and sealing.
Ember Resistance is Mixed- Some roofers note that while the tiles themselves are fire-safe, the curved or mission-style tiles can create natural pockets where windblown embers can lodge. Those embers can still start fires without protection from closed eaves and proper attic ventilation.
Durability Adds to Safety- Clay and concrete tiles have been known for their durability for decades. A long-lasting fire-resistant roof means fewer replacements, fewer vulnerabilities, and less maintenance over time, which roofers see as a long-term safety asset.
Not Ideal for Every Roof- Roofers sometimes caution clients about the weight of tile roofing, which requires a strong roof structure. Homes not designed for heavy roofing may need reinforcement, which adds to the cost.
Roofing professionals’ insights on Clay and Concrete Tiles materials:
“Because all concrete and clay tile roofs offer a non-combustible Class A fire rating – the highest possible fire-resistant rating available – they can play an important role in protecting your home in a fire.“
“Tile roofs are also naturally ‘cooler’ than shingles. The tile itself has more thermal mass and thus impedes the flow of heat through it, while the air gap under the tile allows for moving the heat away, plus further slows down the heat.“
4. Synthetic Composite Shingles
- Fire Rating: Class A.
- Advantages: Designed to mimic wood or slate; lightweight and durable.
- Considerations: Varies by manufacturer; ensure certification.
Synthetic Composite Shingles Considerations
Engineered for Fire Safety– Many synthetic shingles, like fiberglass asphalt shingles or metal roofing, are designed to achieve a Class A fire rating. Roofers often highlight:
Their non-combustible core.
Special additives and coatings that increase flame resistance.
Built-in UV resistance, which helps maintain integrity under intense heat.
Uniform Performance Across Products- Unlike natural materials like wood shakes or slate (which can vary in density and performance), synthetic shingles provide consistent fire resistance across every shingle—something roofers appreciate when aiming for reliability and code compliance.
Lighter Weight, Strong Protection- Synthetic shingles often mimic wood, slate, or tile but are lighter in weight, reducing structural stress while providing excellent fire protection. Roofers like that they combine aesthetics with function, especially when local fire codes require Class A roofing but homeowners want a specific “look.”
Multi-Layered Protection- Many synthetic products are made from polymer blends, sometimes layered with fire-retardant barriers. Roofers report that these layers not only resist flame spread but can also resist ember penetration when paired with the proper underlayment.
Installation Still Matters- As with all roofing systems, the performance depends on installation. Roofers emphasize:
Using Class A-rated underlayments.
Proper sealing at ridges and valleys.
Manufacturer-approved installation methods to maintain warranty and fire rating.
Often Used in Wildfire Zones- Roofers in places like California, Oregon, and Colorado report more homeowners opting for synthetic shingles due to:
Better ember resistance than wood.
Longer life than asphalt.
Aesthetic flexibility with fire-safe performance.
Roofing professionals’ insights on Synthetic Composite Shingles materials:
“Honestly, composite shingles do just fine in fires as long as there aren’t gulleys on the roof where leaves and kindling can collect (or the homeowner has diligently cleared anything combustible off).”
“A product we recommend is F-Wave’s Revia. It’s made with virgin polymer, so it wants to return to its original state. In the sun, it basically heals itself and carries a hail warranty.”
5. Slate Tiles
- Fire Rating: Class A.
- Advantages: Highly durable and fire-resistant.
- Considerations: Very heavy and expensive; requires strong structural support.
Slate Tiles Considerations
Naturally Non-Combustible- Slate is a natural stone that is completely fireproof. Roofers consistently rank slate among the safest materials for fire resistance:
- It won’t ignite, even under direct flame or flying embers.
- It does not contribute any fuel to a fire.
Actual Class A Fire Rating – Without Additives- Unlike other roofing materials that require fire-retardant coatings or special underlayments to reach Class A status, slate naturally qualifies. Roofers often describe it as one of the most reliable Class A options.
Durability is a Huge Advantage- Roofers value slate tiles for the following seasons:
- Do not degrade with heat exposure.
- It can last 75 to 100 years or more.
- Maintain their fire resistance over time, unlike some composites or asphalt products that can wear or lose coatings.
Heavyweight Considerations- A major caveat roofers always bring up is weight. Slate is extremely heavy:
- Homes often need structural reinforcement.
- Improper installation can lead to cracking or breakage, which can create gaps that reduce fire protection and increase water intrusion risk.
Vulnerable to Breakage from Impact- While slate is fireproof, it’s also brittle. Roofers warn that:
- Hail, falling branches, or foot traffic can cause cracks.
- Cracked tiles must be replaced to maintain continuous fire protection.
High-End, High-Cost Choice- Roofers often pitch slate to clients who want a premium, lifelong roof with built-in fire safety—but they’re also quick to say it’s one of the most expensive options, both in material and labor.
Roofing professionals’ insights on Slate Tiles materials:
“I would tell a homeowner who is interested in adding value to their home that slate tiles are considered the gold standard of roofs due to their longevity and fire resistance.”
“Slate is expensive because it lasts forever. It is not really more expensive than shingles when considered over the lifetime of the material. It also looks significantly better, is more resistant to storms, weather, and fire.“
“We did this on old houses in Norway and still do for those who like the look and can take the expense. It’s really beautiful and very durable.“
Materials to Avoid to Help Prevent Roof Fires
- Wood Shakes: Untreated materials pose a significant fire risk due to their high combustibility and frequent lack of fire safety ratings.
- Shingles: Unless treated, they are highly combustible and often unrated.
- Plastic or Vinyl Roofing: Can melt and ignite under high temperatures.
Roofing professionals’ insights on materials to avoid:
“New homeowners may not understand the critical role of roofing materials in fire prevention. If they invested in a home, they should take these fire-prevention measures to protect their investment.”
“The roof is almost always the source of ignition. Steel or terracotta tile roofing is the answer. Wood, asphalt, and rubber membrane are all combustible.”
Installation Considerations on Fire-Resistant Roofs
Proper installation is crucial. Even Class A materials can fail if not installed correctly. Ensure that underlayments and assemblies meet fire-resistant standards. The choice of underlayment significantly affects fire resistance. Every homeowner should have this conversation with the company in charge of the roof installation. It’s good to have an idea of how the roofing pro intends to take every step to make your roof fire-resistant!
This is a topic we suggest homeowners and new roofers take seriously. It’s always a good idea to get informed. Here is a good example of something a new homeowner in Miami might not even know about, in regions like South Florida, specific underlayment combinations are recommended
Roofing professionals’ insights on Underlayment and Assembly:
“I recommend using 22-gauge steel standing seam. Use Polyglass IRXE underlayment. It’ll give your roof a Class A fire rating.“
“Code requires all metal roofs to have a fire barrier. Usually, metal roofs here are done with one layer (or double layer for an upgrade) of 30# felt, a layer of Versashield (fire barrier) on top of the 30#, and finally the metal.”
How iRoofReports Can Help Homeowners in Recent Fire Tragedies
In the wake of devastating wildfires, we understand that no home is just a structure—it holds memories, milestones, and everything that makes life meaningful. At iRoofReports, our hearts go out to every homeowner who’s faced loss, fear, or uncertainty after a fire.
That’s why we’re committed to doing more than providing roof reports—we’re here to be part of the recovery. Our fire-resistant roofing insights and accurate, fast roof reports can help homeowners make informed decisions as they rebuild. Whether it’s confirming roof damage for insurance claims or exploring Class A-rated materials for better protection in the future, our tools are designed to simplify a complex process and bring clarity when needed most.
Protect your family. Protect your investment. Know your roof.
