Fire safety compliance represents a critical design parameter in modern building envelope engineering. The NFPA 285 and ASTM E84 test standards establish quantifiable performance criteria that determine how exterior wall assemblies and materials perform under calibrated fire exposure conditions. These standards ensure that wall assemblies resist flame spread and smoke development, protecting both occupants and structures in the event of a fire. Advanced Architectural Products (A2P) maintains comprehensive third-party testing documentation for the GreenGirt CMH™ continuous insulation and SMARTci® building enclosure systems, confirming adherence to NFPA 285 assembly requirements and ASTM E84 Class A material classifications through independent laboratory validation.
NFPA 285 Fire Safety Compliance
The NFPA 285 code, “Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Beading Wall Assemblies Containing Combustible Components,” is a full exterior wall assembly test, and outlines fire testing criteria for evaluating the fire propagation characteristics of non-load-bearing exterior wall assemblies containing combustible components. This standard ensures that wall assemblies meet specific fire performance criteria and can prevent the vertical and lateral spread of fire in multi-story buildings, including building envelopes in high-rise and commercial construction.
The International Building Code (IBC) mandates NFPA 285 compliance when exterior walls on certain construction types include combustible components, such as foam plastic continuous insulation, combustible WRBs, or cladding made from combustible materials, installed on buildings over 40 feet in height or classified as Type I-IV construction. Having these guidelines in place save lives and property by preventing the rapid spread of fire across a building’s exterior.
Test Methodology and Performance Criteria
The NFPA 285 protocol subjects a complete two-story wall assembly (minimum 16′ height x 13’4″ width) to calibrated fire exposure through a window opening. Pass/fail determination requires: vertical flame propagation limited to 10 feet above the window opening, lateral flame spread is restricted to 5 feet from the centerline, a temperature threshold maximum of 1,000°F at specified thermocouples, and no flame penetration to the interior face.
ASTM International
The ASTM International develops and publishes voluntary consensus technical standards for materials, products, systems, and services. ASTM International includes 12,000 standards for various industries, including construction, manufacturing, transportation, and more. The goal of ASTM International is to enforce standardized testing, as testing and specifications improve product quality and safety prior to installation or additional use.
ASTM E84 Class A Rating
Included in the ASTM International standards is ASTM E84: “Standard Test Method for Surface Burning Characteristics of Building Materials”. This standard specifically addresses surface-testing materials, not whole assemblies. ASTM E84 measures flame spread, measured in FSI (Flame Spread Index), and SDI (Smoke Developed Index), of materials in a controlled environment. The highest rating for ASTM E84 is Class A, which requires a:
- Flame spread index of 0 to 25 (baseline: inorganic reinforced cement board = 0)
- Smoke developed index of 450 or less (baseline: red oak flooring = 100)
Class A materials demonstrate superior fire-resistant properties validated for applications requiring stringent fire performance criteria.
GreenGirt CMH & SMARTci Systems: Fire Safety Compliance
A2P’s portfolio of systems incorporate non-combustible core components, including GreenGirt CMH’s steel-reinforced flanges and a composite fiberglass base. To verify performance requirements for continuous insulation applications, GreenGirt CMH and SMARTci systems underwent testing per NFPA 285 and ASTM E84 protocols, documenting quantifiable resistance to flame propagation.
According to Technical Evaluation Report 1501-06, the components of the SMARTci system, including the GreenGirt CMH Z-girts, XPS, and polyiso insulation, achieved Class A ratings, meaning that all three components recorded an FSI less than 25 and an SDI less than 450.
In addition, the GreenGirt CMH and SMARTci systems were tested to assess performance in vertical and lateral fire propagation to determine compliance with NFPA 285 using polyiso insulation, a metal stud wall without exterior sheathing, and ACM cladding. Results concluded that the assembly demonstrated complete fire safety compliance with all NFPA 285 acceptance criteria, with no contribution to vertical or lateral flame propagation beyond prescribed limits. The cladding attachment system maintained structural integrity throughout the test duration.
A2P’s commitment to fire-resistant building envelope design includes comprehensive third-party validation ensuring all materials and systems satisfy NFPA 285 and ASTM E84 regulatory requirements, delivering quantifiable safety performance for each installation incorporating GreenGirt CMH and SMARTci systems.
Conclusion
Through documented NFPA 285 compliance and verified ASTM E84 Class A ratings, GreenGirt CMH and SMARTci systems deliver proven fire safety performance for continuous insulation applications. These systems demonstrate A2P’s commitment to providing code-compliant building envelope solutions that protect occupants, safeguard structures, and uphold the integrity of modern construction standards.
Verify Fire Safety Compliance for Your Project
Download the full Technical Evaluation Report 1501-06 documenting NFPA 285 and ASTM E84 Class A test results for GreenGirt CMH and SMARTci systems.
Download Technical Report (PDF)
Need help specifying a fire-compliant wall assembly? Our engineering team can assist.
Related Resources:
View “Best Practice: Fire Resistance in Construction”
Read “Overview of NFPA 285 Fire Testing of Exterior Wall Assemblies”
Read “A Guide to Understanding ASTM E84: Maximizing Fire Safety for Your Architectural Products”
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Frequently Asked Questions
When do I need NFPA 285 for an exterior wall with continuous insulation?
NFPA 285 is required by the IBC when certain exterior wall construction types include combustible components, such as foam plastic continuous insulation, combustible WRBs, or combustible cladding, on buildings over 40 feet tall or classified as Type I–IV construction.
What are the NFPA 285 acceptance criteria?
NFPA 285 tests a full, two-story wall assembly (minimum 16′ tall x 13’4″ wide) with fire exposure through a window opening. To pass, the assembly must limit vertical flame propagation to 10 ft above the window opening, restrict lateral flame spread to 5 ft from the centerline, stay under 1,000°F at specified thermocouples, and show no flame penetration to the interior face.
What does ASTM E84 Class A mean, and how does it apply to SMARTci components?
ASTM E84 is a surface-burning test for materials (not a whole wall assembly) that reports FSI (Flame Spread Index) and SDI (Smoke Developed Index). Class A requires FSI 0–25 and SDI 450 or less. Per A2P’s Technical Evaluation Report 1501-06, SMARTci components, including GreenGirt CMH Z-girts, XPS, and polyiso, achieved Class A, meaning all three recorded FSI < 25 and SDI < 450.