Autoclaved Aerated Concrete (AAC)
FIRE-RATED ASSEMBLIES
Noncombustible wall and floor systems with tested, code-recognized fire resistance for commercial and multifamily construction
WHY AAC FOR FIRE-RATED CONSTRUCTION
Megaacrete AAC is a lightweight, mineral-based masonry and panel system that delivers inherent fire resistance as part of the assembly—not as an added layer. AAC walls, floors, and shafts can be configured to meet common hourly fire-resistance requirements while also supporting durable, moisture-tolerant, impact-resistant enclosures.
Simplified assemblies
In many rated designs, AAC can reduce the number of layers required to meet fire and durability needs—supporting faster sequencing and fewer trade overlaps.
built in fire resistance
AAC is noncombustible and performs as a mass material in fire exposure. Fire ratings are achieved through thickness, detailing, and tested assembly configurations rather than relying solely on membranes.
Safer, more resilient envelope and interiors
AAC does not contribute fuel to a fire and can help limit fire spread through rated separations when assemblies are properly detailed and installed.
TYPICAL AAC FIRE-RATED APPLICATIONS
For architects, contractors, and owners, AAC is commonly used for:
Exterior bearing and non-bearing walls (rated where required by occupancy/type and exposure conditions)
Party walls / demising walls between units
Corridor walls and tenant separations
Stair and elevator shafts
Mechanical rooms / electrical rooms
Fire walls and fire barriers (when designed to meet continuity and structural stability requirements)
Floor and roof panels where a rated horizontal assembly is required
Parapets and roof edge conditions with rated continuity detailin
UL LISTED ASSEMBLIES
Megaacrete AAC fire-rated wall and floor systems are supported by UL-listed assemblies, giving architects, contractors, and inspectors confidence that the design meets recognized fire-resistance testing standards. These listings provide clear guidance for wall thickness, finishes, joints, and penetrations so rated assemblies can be detailed, specified, and inspected with confidence.
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Talk to Us About Your Fire-Rated Assembly Needs
If you’re designing or building a project that needs 1-hour, 2-hour, or higher-rated separations, we’ll help you select an AAC assembly and detail it for approvals and inspections. Contact us to request assembly guidance, details, and project-specific recommendations.