Dulux® Acratex®
Coventry® Medium
Coventry® Medium
What is AAC and what can it do for your build?
Autoclaved Aerated Concrete (AAC)
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Autoclaved aerated concrete (AAC) is a pre-rendered, lightweight concrete panel designed to deliver strength, efficiency and performance.
Autoclaved aerated concrete (AAC) is a form of lightweight concrete designed to deliver strength, efficiency and modern performance in residential and multiresidential construction. Hardie™ Gravis™ Panel is made from AAC, combining the solid feel of masonry with the benefits of lighter weight and ease of installation.
AAC is manufactured using a carefully controlled mix of cement, sand, lime, gypsum and water. This mixture is poured into molds, where it expands to create millions of tiny air pockets. The material is then autoclaved (steamcured under high pressure) to harden it into a lightweight yet solid concrete panel.
To deliver longterm strength and durability, Hardie™ Gravis™ Panel features embedded, anticorrosion steel mesh reinforcement, providing structural integrity while maintaining the benefits of AAC’s reduced weight.
Widely valued for its thermal performance, acoustic properties and noncombustible nature, AAC is well suited to external walls, intertenancy walls and flooring applications in Australian homes. With Hardie™ Gravis™ Panel, James Hardie brings AAC together with fibre cement under one trusted brand, making it easier to specify, design and build modern mixed material homes with confidence.
Coatings & finishes for AAC
Once installed on the exterior, Hardie™ Gravis™ Panel is finished with a render coating system, providing a solid substrate for a wide range of colours, textures and finishes. This allows you to achieve the clean, contemporary rendered look many homeowners love, enhancing street appeal and bringing your personal design vision to life.
A variety of render textures can be applied to create different visual effects, from smooth, refined finishes to more tactile or expressive surfaces, allowing the exterior of the home to be tailored to a range of architectural styles.
Explore available coatings & finishes
Dulux® Acratex®
Coventry® Coarse
Coventry® Coarse
Dulux® Acratex® Mediterranean
Classique Coarse
Classique Coarse
Rockcote Cerano Hydratech
Dulux® Acratex®
Coventry® Medium
Coventry® Medium
These rendered surfaces work seamlessly alongside Hardie™ fibre cement cladding profiles, where contrasting textures and lines can be combined to add depth, balance and visual interest across the facade. Together, rendered walls and fibre cement cladding create cohesive mixed‑material designs that feel considered, modern and enduring.
To achieve the best result for your chosen finish, coating manufacturers’ application guides should be followed to ensure the render system is applied as intended and performs at its best. As a render‑ready wall panel, Hardie™ Gravis™ Panel offers a simple, dependable way to deliver modern rendered aesthetics, while providing the durability, comfort and confidence families rely on.
Features & Benefits
Energy Efficient
Hardie™ Gravis™ Panel’s aerated structure offers excellent thermal insulation, helping homes stay cool in summer and warm in winter. Leveraging our 7-Star and Energy Efficiency Technical Tools & Support, Hardie™ Gravis™ Panel can help you achieve your Star Rating requirements.
Quiet Living Spaces
Hardie™ Gravis™ Panel can help reduce sound transmission between rooms and floors, creating peaceful interiors.
Creative Freedom
Approved for use with a wide range of leading coating and paint systems, Hardie™ Gravis™ Panels can be rendered and painted to achieve a range of curated textures and finishes. Hardie™ Gravis™ Panel can be paired with your choice of Hardie™ fibre cement external cladding to achieve endless design possibilities.
Fast & Efficient Build
Hardie™ Gravis™ Panel can enable fast and efficient construction. Backed by Australia’s #1 cladding brand, James Hardie can help you achieve your homes mixed-material designs in desired time frames and budget.
Built-In Fire Resistance
Non-combustible, Hardie™ Gravis™ Panel meets all Bushfire Attack Level (BAL) requirements, making it suitable for bushfire prone areas.
Engineered to Endure
Hardie™ Gravis™ Panel is a steel reinforced panel with corrosion protection for long term structural integrity.
Suitable for a wide range of applications
External Cladding
An external cladding solution to create durable, rendered facades with strong thermal, acoustic and fire performance.
Intertenancy Walls
Intertenancy wall systems with Hardie™ Gravis™ Panel to provide a solid, non‑combustible barrier that helps manage fire and sound separation between dwellings.
Flooring
Hardie™ Gravis™ Floor Panel is used as a structural subfloor, delivering a concrete‑like feel with improved acoustic performance in suspended floor systems.
Medium Density Construction
Hardie™ Gravis™ Panel supports medium‑density construction by offering a lightweight masonry solution suitable for walls, floors and facades in multi‑residential buildings.
AAC frequently asked questions
AAC stands for autoclaved aerated concrete. It is a lightweight form of concrete that is strong, durable and commonly used in modern homes for walls and floors. AAC panels are made by steam‑curing concrete under high pressure, creating a solid material with millions of tiny air pockets making it lighter than traditional concrete.
AAC is commonly used for external walls, intertenancy walls and flooring in residential and multi‑residential homes. It is valued for its strength, performance and suitability for modern building designs.
It depends on how it’s used.
Yes. AAC is strong, durable and built for longterm performance.
AAC is a form of lightweight concrete that combines the solid feel of masonry with reduced weight and ease of installation. Hardie™ Gravis™ Panels are manufactured with embedded, anticorrosion steel mesh reinforcement, helping provide longterm structural integrity and durability in Australian conditions.
Choosing AAC from James Hardie means getting the performance of AAC, backed by the confidence of a trusted brand.
Hardie™ Gravis™ Panel brings autoclaved aerated concrete together with Hardie™ fibre cement under one portfolio, making it easier to design and build modern mixedmaterial homes with compatible systems, approved junctions and consistent detailing.
As part of the Hardie™ product range, Hardie™ Gravis™ Panel is supported by local technical expertise, installation guidance, and an established distribution network, giving builders and designers confidence in quality, availability and ongoing support.
Take a look at the different
Hardie™ Gravis™ Panel types
Solid performance ready for modern design.
Hardie™ Gravis™ Panel Wall 75
Hardie™ Gravis™ Panel Wall 75 provides a 75mm thick, smooth, render-ready surface ideal for a cohesive modern facade or standout feature wall usage. The 75mm wall panel is made with a low-density formula and is often chosen to create deep window reveals.
Hardie™ Gravis™ Panel Wall 50
A 50mm thick, steel-reinforced autoclaved aerated concrete (AAC) panel for fast, efficient cladding and intertenancy walls.
Hardie™ Gravis™ Panel Floor
Hardie™ Gravis™ Panel flooring is a robust 75mm AAC tongue and groove panel that offers the strength and comfort of concrete for first floors, suspended ground floors, decks, and balconies. This non-combustible flooring provides a solid, stable, squeak-free, concrete-like base for any floor covering, with excellent thermal and acoustic insulation.
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