Hardie™ Gravis™ Panel
The Modern Rendered Look Starts With the Right Base
The smooth, contemporary rendered facade has become one of the defining looks in new Australian residential architecture, but achieving it well depends entirely on what sits behind the render. Get the base wrong and you’re looking at cracking, poor thermal performance and a facade that never quite settles. Hardie™ Gravis™ Panel is James Hardie’s newest wall panel system, purpose-built to be that base: a render-ready surface engineered from steel-reinforced autoclaved aerated concrete (AAC) that gives architects and builders a genuinely better starting point for the modern rendered aesthetic.
Because it’s AAC rather than fibre cement, Gravis™ brings a different set of properties to the wall: better thermal mass, stronger acoustic performance and a panel that pairs effortlessly with James Hardie’s fibre cement range for mixed-material facades. CSP Architectural supplies the complete Hardie™ Gravis™ Panel range, joining Commercial, External Cladding, Interior Linings, Fire-Rated Wall Systems and Floors as the sixth category in our James Hardie™ offering.
Technical Specifications
Material
Autoclaved aerated concrete (AAC) — steel mesh reinforced
Available thicknesses
50 mm · 75 mm
Panel width
600mm (all products)
Panel lengths
2200 mm · 2400 mm · 2550mm · 2700mm · 2850mm · 3000mm (both thicknesses) · 3300mm (75mm only)
Joint design
Square joint
Steel reinforcement
Single mesh throughout the range
Surface
Render-ready — designed to receive a direct render finish
Thermal performance
Genuine thermal mass helps maintain comfortable indoor temperatures.
Acoustic performance
Reduces noise transfer for a quieter home
Certification
CodeMark certified — separate certifications for External & Zero Lot Walls and Intertenancy Walls
Warranty
25-year product warranty
Compatible applications
External walls · Zero lot walls · Intertenancy walls
Pairs with
James Hardie™ fibre cement products — for mixed-material facade design
Why Gravis™ Through CSP
Thermal and acoustic mass fibre cement can't match
AAC's cellular structure gives Gravis™ genuine thermal mass and sound-dampening properties that a thin fibre cement sheet doesn't have, which is relevant on projects where indoor comfort and noise reduction are part of the brief, not just the facade appearance.
CodeMark certified for two wall types
Separate CodeMark certifications for External & Zero Lot Walls and Intertenancy Walls give specifiers and certifiers independently verified NCC compliance documentation for both standalone and attached dwelling construction.
Designed to pair with the rest of the Hardie™ range
Gravis™ isn't a standalone product line, it's built to combine with Axon™, Linea™ and the wider Hardie™ Exteriors range for considered, mixed-material facades, all backed by the one manufacturer's warranty and documentation.
25-year warranty, take-off service included
Backed by James Hardie's 25-year product warranty. CSP's take-off service is available to confirm the correct panel lengths and quantities for your specific wall heights before you order.
Where Hardie™ Gravis™ Panel Works Best
Modern rendered facades
The primary application is a render-ready AAC base for the smooth, contemporary rendered look increasingly specified on new residential builds. James Hardie shows Gravis™ used as the ground-floor material in both Box Modern and Modern Coastal home styles, paired with fibre cement above.
Standout feature walls
Beyond full-facade use, Gravis™’s render-ready surface makes it a strong choice for a single feature wall or entry statement, where the rendered texture is intended to read as a deliberate material contrast against the surrounding cladding.
Mixed-material designs with Hardie™ fibre cement
Gravis™ is explicitly designed to pair with James Hardie’s fibre cement range; a rendered AAC ground floor with Axon™ Cladding or Linea™ Weatherboard above is a combination James Hardie itself demonstrates, giving architects a cohesive two-material facade from a single manufacturer.
Zero lot and intertenancy wall construction
Separate installation guides and CodeMark certifications exist for External & Zero Lot Walls and for Intertenancy Walls, meaning Gravis™ is a documented, compliant option for medium-density and attached dwelling construction, not just standalone houses.
Steel-Reinforced AAC, Not Fibre Cement
Every other product in the James Hardie™ Exteriors range is fibre cement. The Hardie™ Gravis™ Panel is the exception; it’s manufactured from autoclaved aerated concrete (AAC), the same lightweight, cellular concrete technology behind the Hebel range, reinforced internally with steel mesh for structural integrity. That material difference is what gives Gravis™ its specific advantages: genuine thermal mass that helps maintain comfortable indoor temperatures and acoustic mass that reduces noise transfer for a quieter home, properties that a thinner fibre cement panel can’t match in the same way.
Featured Projects with Hardie™ Gravis™ Panel
Frequently Asked Questions
What is the Hardie™ Gravis™ Panel made from?
Hardie™ Gravis™ Panel is made from autoclaved aerated concrete (AAC), reinforced internally with steel mesh, a different material to the fibre cement used across the rest of the James Hardie™ Exteriors range. AAC’s cellular structure gives Gravis™ genuine thermal mass and acoustic dampening properties, which is why James Hardie positions it around indoor comfort (temperature and noise) as much as its render-ready surface.
What thicknesses and lengths does Hardie™ Gravis™ Panel come in?
Gravis™ is available in 50 mm and 75 mm thicknesses, both at 600 mm width. Length options run from 2200mm to 3000mm in both thicknesses, with an additional 3300mm length available in the 75mm range only. All panels use a square joint and single mesh steel reinforcement. Contact our team or use the take-off service to confirm the right length combination for your wall heights.
Is the Hardie™ Gravis™ Panel suitable for intertenancy and zero-lot wall construction?
Yes. The Hardie™ Gravis™ Panel carries separate CodeMark certifications and installation guides for External & Zero Lot Walls and for Intertensancy Walls, meaning it’s a documented, compliant option for both standalone dwellings built to the boundary and attached or medium-density construction requiring a separating wall between units.
Can the Hardie™ Gravis™ Panel be combined with James Hardie fibre cement products?
Yes, this is one of the product’s key design intentions. James Hardie explicitly demonstrates Gravis™ paired with Axon™ Cladding and Linea™ Weatherboard in Box Modern and Modern Coastal home designs, typically as the ground-floor render-ready material with fibre cement cladding above. This gives architects a considered, mixed-material facade sourced entirely from the James Hardie™ range.
What warranty does the Hardie™ Gravis™ Panel carry?
The Hardie™ Gravis™ Panel is backed by a 25-year product warranty, consistent with other premium products in the James Hardie™ range. Full warranty documentation is available on request; contact our team for the current warranty terms.
Does CSP Architectural offer a take-off service for Hardie™ Gravis™ Panel?
Yes. CSP Architectural’s take-off service is available for Hardie™ Gravis™ Panel; send us your architectural drawings, and we’ll calculate the exact panel lengths, thicknesses and quantities required for your project, helping minimise cutting and waste across the 50mm and 75mm ranges.