Maximo Thermo BurnBlock · California
Wood you love, fire safety you need.
Maximo Thermo BurnBlock is Class A fire-rated real wood, built for California projects that need beauty, performance and code-ready protection.
- Class AASTM E84 fire rating
- California WUIApplication-specific documentation
- Real woodThermally modified Ayous
- 20-Year WarrantyBacked by Maximo
Applications
Class A fire protection, wherever you need it
Explore real-world applications, discover available profiles, and find inspiration for your next project.
Some photos are Maximo Thermo installations. California BurnBlock project photography will be added as jobs complete.
- Deep Impregnation
- Class A Fire Rated
- Real Wood Look & Feel
BurnBlock® Technology · Class A fire-rated
Fire performance starts within
- 1. Impregnated, not coated.Using a specialized vacuum-pressure process, BurnBlock penetrates deep into the wood's cellular structure. It's not simply brushed or sprayed onto the surface.
- 2. Engineered to slow flame spread.When exposed to intense heat, BurnBlock helps the wood char and release moisture, reducing the spread of flames. The result is tested Class A flame-spread performance.
- 3. Still everything you love about wood.Natural grain, beautiful color, and easy workability. Cut, profile, and install Maximo Thermo like regular wood. Because that's exactly what it is.
Tested and documented
Fire rating that meets the California code
Tested to ASTM E84 and CSFM 12-7A-1, documented for Chapter 7A and WUI plan checks, and ready for projects in wildfire-prone areas.
The 3-minute fire test
Two pieces of wood. One with BurnBlock, one without. Both exposed to an open flame. Watch how differently they react to fire.
*On-site demonstration with a handheld torch, not a standardized test. The Class A rating (Flame Spread Index 5, Smoke Developed Index 0) comes from ASTM E84 report FTST25895, available below.
Preview in your space
Here you can see our products applied to your space in just one click. Upload a photo, choose an application and a profile, and Maximo does the rest.
*The images made by this tool are AI-Generated and serve just illustrative purposes. Results may vary from the image and the real product. Your photo is used only to generate this preview and isn't stored.
Rendering your space…Maximo Lens
Here you can see our products applied to your space in just one click.
JPG, PNG and WebP Supported
*The images made by this tool are AI-Generated and serve just illustrative purposes. Results may vary from the image and the real product.
Available now, wherever you are in California
Maximo Thermo BurnBlock is available through California dealers, with coverage in the regions hit hardest by wildfire.
Wildfire-affected areas · CA
- Pacific PalisadesPalisades Fire · 2025
- AltadenaEaton Fire · 2025
- MalibuFranklin Fire · 2024
- ParadiseCamp Fire · 2018
- Santa RosaTubbs Fire · 2017
Stocking dealers
Talk to a specialist
Quote your project now
Tell us about the project. A specialist comes back with availability, lead time and the fire-test documents your plan check needs.
- Lead time
- 2–3 weeks
People usually ask
Do I need to finish the back face?
No. Thermo is modified through the full thickness and BurnBlock® is impregnated into the board, so there is no exposed untreated core.
Does BurnBlock® siding need a rainscreen?
Yes. Maximo recommends a ventilated cavity behind any wood cladding. It keeps both faces at the same moisture level and is a condition of the 20-Year Warranty on exterior walls.
Where can I buy in California?
Maximo Thermo BurnBlock is stocked with dealers across California, including coverage near the areas hit hardest by wildfire. Request a quote and a specialist points you to the right dealer for your project.
What are lead times for California orders?
Standard profiles ship in 2–3 weeks. Custom milling and large volumes vary by scope. A specialist confirms a timeline with your quote.
Does BurnBlock meet the ASTM E84 Class A requirement for WUI zones?
Yes. Maximo Thermo Ayous BurnBlock carries a Class A fire rating under ASTM E84 and has passed CSFM 12-7A-1 wildfire exposure testing.
Can architects include BurnBlock in a spec without a proprietary spec?
Yes. BurnBlock specs cleanly as a performance-based product.
Does treatment affect the structural properties of the wood?
No. BurnBlock is impregnated at the cellular level, not a surface coating, so every board keeps its full machinability.
What wood species is available for BurnBlock treatment?
Ayous. A naturally durable, lightweight wood that takes BurnBlock's cellular-level protection exceptionally well, giving a refined, consistent look backed by real fire test data.