Magnesium oxide (MgO) boards that comply with NFPA 285 standards are highly valued in the construction industry, particularly for multifamily buildings and commercial structures. NFPA 285 is a fire test method that evaluates the fire propagation characteristics of exterior wall assemblies containing combustible materials.
What is NFPA 285?
NFPA 285, also known as the "Standard Fire Test Method for Evaluation of Fire Propagation Characteristics of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible Components", is a crucial test that ensures a wall assembly can resist vertical and lateral fire spread under real-world conditions. The test simulates a fire starting on the building’s interior and spreading to the exterior, helping to determine whether the exterior wall assembly contributes to flame propagation.
For MgO boards used in NFPA 285-compliant assemblies, here are some key factors:
Key Benefits of NFPA 285-Compliant MgO Boards
Non-Combustible Nature
MgO boards are non-combustible, and MagMatrix BMSC 517 new sulfate MGO BOARD Perseverance model with the ASTM E136 noncombustible and owning the ICC-ESR certification which means they do not ignite, fuel the fire, or produce toxic smoke when exposed to flames. This makes them a suitable component in NFPA 285-rated wall assemblies, especially when combined with other materials like insulation and weather barriers that must meet fire safety standards.
Meets Fire Propagation Standards
MgO boards are often a critical part of NFPA 285-compliant assemblies because they help prevent the spread of flames. In multifamily buildings and commercial structures, where safety is paramount, using materials that meet NFPA 285 standards ensures that exterior walls will not contribute to the rapid spread of fire.
Flexibility in Wall Assemblies
NFPA 285 compliance is not just about the board itself but the entire wall assembly, which includes layers like sheathing, insulation, air and vapor barriers, and cladding. MgO boards can be integrated into many fire-rated assemblies, often alongside insulation materials (e.g., spray foam or rigid insulation), and still meet the NFPA 285 fire propagation criteria.
Compatibility with Other Fire-Resistant Materials
MgO boards can be used in conjunction with other fire-resistant materials like mineral wool insulation, metal panels, and specific cladding systems. This allows for flexibility in design without sacrificing fire safety, particularly in multistory buildings.
Uses of NFPA 285-Compliant MgO Boards in Building Construction
Exterior Wall Assemblies
MgO boards are often used as structural sheathing in exterior walls of multifamily or high-rise buildings, particularly where fire-rated performance is necessary. By incorporating them into an NFPA 285-compliant assembly, the overall fire resistance of the building is enhanced, preventing vertical flame spread through exterior walls.
Continuous Insulation Systems
In exterior wall assemblies that require continuous insulation (CI), MgO boards provide the necessary fire protection. When paired with materials like spray foam insulation or rigid foam, the MgO board serves as the fire-resistant barrier in these assemblies, helping meet the NFPA 285 fire performance criteria.
Rain Screen and Cladding Systems
MgO boards are frequently used in rain screen systems, where the wall assembly must meet stringent fire performance standards. NFPA 285 compliance ensures that the MgO board can be safely integrated with ventilated cladding systems, making it a suitable choice for commercial and multifamily buildings that use modern cladding.
Notable Examples of NFPA 285-Compliant MgO Boards
MagMatrix New Sulfate MgO Panels
MagMatrix wall sheathing panels are an example of NFPA 285-compliant MgO boards. These structural, fire-resistant magnesium oxide panels can be used in exterior wall assemblies that meet fire propagation standards. MagMatrix's new sulfate MGO panels of the multi-support model are frequently specified for Type III construction, which is commonly used in mid-rise and multifamily buildings.
MagMatrix SIS MGO Sheathing
MagMatrix MgO structural insulated panels (SIPs) are another option for exterior wall assemblies that must meet NFPA 285. These panels combine the MgO board with poured polyurethane insulation, providing a strong, fire-resistant barrier while offering thermal insulation.
Conclusion
NFPA 285-compliant MgO boards are a reliable, fire-resistant component of exterior wall assemblies in multifamily buildings and commercial structures. Their non-combustible properties, combined with the ability to integrate into various assemblies, make them ideal for use in projects that require high levels of fire protection. These boards help meet critical fire safety standards, ensuring that buildings can better resist flame spread and protect occupants in the event of a fire.
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