MaxiWall AAC Panel System

Independent fire testing assessed by IGNIS Labs certifies a fire resistance level (FRL) of at least -/120/120 for the 50mm MaxiWall panel and at least -/180/180 for the 75mm panel (Certificates of Conformity CM40353 and CM40354). Complete wall systems are specified to meet NCC requirements, including the 60/60/60 FRL required for party walls. The rating achieved depends on the documented system build-up, so always specify from the relevant MaxiWall system manual.

Yes. MaxiWall has fully documented external wall systems for houses, low-rise multi-residential and high-rise buildings, finished with an approved render or coating system as set out in the installation guides. The 50mm and 75mm external wall systems both carry Certificates of Conformity for fire performance.

MaxiWall is significantly lighter and faster to install than brick. Autoclaved aerated concrete is about one fifth of the mass of conventional concrete and uses roughly one quarter of the raw material, while delivering better insulation than standard masonry. Panels are 600mm wide and cut with standard construction tools, so walls go up faster with lower labour cost. See our detailed AAC vs brick comparison.

Both MaxiWall and Hebel are autoclaved aerated concrete (AAC) systems, so they share the core material benefits of light weight, non-combustibility and built-in thermal and acoustic insulation. MaxiWall is Big River Group’s AAC panel system: it is supplied with certified 50mm and 75mm wall systems and full installation manuals, and it is stocked through Big River’s national network of trade centres, where it can be supplied together with framing, cladding and the rest of your build. Talk to your local Big River team for a side-by-side specification for your project.

Stocked MaxiWall panels are 75mm thick and 600mm wide, in lengths of 1800mm, 2400mm, 2550mm, 2700mm, 2850mm and 3000mm. Panel weights range from 44kg (1800mm) to 73kg (3000mm), so two installers can handle them without lifting equipment. A certified 50mm system is also documented for external and party wall applications.

MaxiWall panels are autoclaved aerated concrete reinforced with corrosion-protected steel mesh, sourced from world-class production facilities that use automated processes for consistent quality. Aerating the concrete creates a structure that uses approximately one quarter of the raw material of conventional concrete and incorporates a large quantity of air, which is what gives the panels their combination of low weight, non-combustibility and insulating performance – about one fifth of the mass of conventional concrete with superior thermal properties.

It depends on the system. The certified 50mm external wall system uses a load-bearing AAC panel with a minimum nominal dry density of 510 kg/m3, fixed vertically to timber or steel framing. Higher-density AAC is used for load-bearing walls, while the documented high-rise internal wall systems are non-load-bearing partitions. Specify from the relevant MaxiWall system manual for your application.

Documented 75mm MaxiWall external wall systems achieve sound insulation ratings of Rw 38 to 42 (Rw+Ctr 23 to 27) depending on the lining build-up. The documented party wall system is designed to meet the NCC requirement of Rw+Ctr 50 with an FRL of 60/60/60, using discontinuous construction for acoustic separation.