ASTM-E84 Standards: Overview of ASTM E84
ASTM E84 is one of the most widely recognized fire testing standards in North America. Often referred to as the “Surface Burning Characteristics of Building Materials” test, it helps determine how building materials behave during the early stages of fire exposure.
What Is ASTM E84?
ASTM E84 measures the flame spread and smoke development of building materials when exposed to fire. It evaluates how quickly a flame travels across the surface of a material and how much smoke it generates. These measurements help classify materials by their fire resistance, making ASTM E84 an essential benchmark for architects, builders, code officials, and material manufacturers.
Why ASTM E84 Matters
In commercial and residential construction, fire safety is paramount. Materials used for walls, ceilings, decking, and siding must meet certain fire resistance standards to ensure the safety of occupants and comply with local building codes. ASTM E84 results are used to assess whether materials are suitable for use in fire-prone environments, including the Wildland Urban Interface (WUI) zones common in states like California.
What the ASTM E84 Test Measures
The test evaluates two key factors:
- Flame Spread Index (FSI): Measures how far and how fast flames spread across the surface.
- Smoke Developed Index (SDI): Measures the amount of smoke produced during combustion.
For reference, red oak has an FSI of 100, while inorganic cement board rates at 0. These two serve as benchmarks for the classification system.
ASTM E84 Fire Rating Classifications
Materials tested under ASTM E84 are categorized into the following fire ratings:
- Class A: FSI of 0-25 (highest level of fire resistance)
- Class B: FSI of 26-75
- Class C: FSI of 76-200
A Class A rating is often required for materials used in public buildings, commercial projects, and WUI zones. It indicates superior resistance to flame spread and minimal smoke development.
ASTM E84 vs. Other Fire Testing Standards
ASTM E84 is frequently compared with other fire safety tests:
- ASTM E108: Focuses on fire exposure for rooftop materials, including burning brands and wind-driven flames.
- CSFM 12-7A-4: California-specific testing for WUI compliance.
- CAN/ULC S102: Canadian equivalent of ASTM E84, used in similar applications.
Each test addresses different conditions and materials. ASTM E84 remains the standard for evaluating the surface burning characteristics of decking, siding, and panel products.
Why ASTM E84 Matters for Decking
Decking in fire-prone areas must be rigorously evaluated for flame spread and smoke development to ensure both public safety and regulatory compliance. As more U.S. jurisdictions adopt the Wildland Urban Interface (WUI) code, ASTM E84 Class A fire ratings are becoming increasingly important.
Materials that meet this standard are essential for:
- Achieving code compliance in high-risk states such as California, Colorado, and Oregon
- Meeting increasingly stringent insurance requirements tied to wildfire exposure
- Supporting safe design in high-traffic environments like commercial properties, multifamily residences, hospitality spaces, and civic infrastructure
Choosing decking materials with verified ASTM E84 Class A ratings ensures early-stage fire resistance and helps future-proof projects as regulations continue to evolve.
How MOSO® Bamboo Performs on ASTM E84
MOSO® Bamboo decking products are Class A fire-rated, achieving a Flame Spread Index (FSI) of 10. This high level of fire resistance is achieved without relying on fire retardant chemical treatments (FRT). Instead, the performance is built into the product through its dense structure and thermal modification process, which alters the bamboo at a cellular level to enhance fire resistance and durability.
In addition to ASTM E84, MOSO® Bamboo products are rigorously tested and compliant with multiple fire and safety standards, making them suitable for a wide range of high-risk applications:
- CSFM 12-7A-4 (California WUI): Approved for use in Wildland Urban Interface zones
- ASTM E108 (rooftop fire exposure): Certified for use in horizontal installations exposed to open flame and wind
- CAN/ULC S107 (Canada rooftop applications): Meeting Canadian compliance for fire-rated rooftop materials
These certifications further demonstrate MOSO’s commitment to quality and code compliance, offering architects, builders, and developers a safe and durable material choice for fire-sensitive zones.
This chart underscores the unmatched performance of MOSO® Bamboo, especially in fire-sensitive environments where safety, durability, and compliance are non-negotiable.
Specifying Fire-Rated Bamboo Decking
ASTM E84 provides the technical confidence needed to specify fire-rated bamboo decking in code-sensitive areas. Architects and specifiers can:
- Reference ASTM E84 results in construction documentation
- Use Class A fire-rated materials in WUI and urban commercial zones
- Encourage adoption by stakeholders focused on fire safety and sustainability
Architects can explore MOSO®’s 1-credit CEU course on fire-rated bamboo decking.
ASTM E84 Compliance: What It Means for Your Project
ASTM E84 remains the gold standard in fire resistance testing, especially for surface-level materials like decking and siding. For builders and architects working in high-risk fire zones or aiming for Class A-rated materials, ASTM E84 testing is a must. Choosing materials that exceed these standards helps safeguard structures while meeting code and performance requirements.
Explore the look and feel of Class A bamboo decking. Order your sample today or locate a dealer near you for fire-rated bamboo decking solutions.
