AAC Panel Render Systems

AAC panels — commonly known by brand names such as Hebel, Loxo, and Nasahi — are now standard practice across Australian residential and light commercial construction, and for good reason: they’re lightweight, fast to install, and deliver strong thermal performance compared with traditional brick or block. But AAC’s biggest strength is also its biggest render risk. The panels are highly porous, and a standard cement-based render will draw moisture out of the mix before it can cure properly, leading to cracking and adhesion failure. AAC render is not a job for a general-purpose product — it requires a purpose-built, polymer-modified acrylic system.

Unitex manufactures two Base Coat Render systems specifically suited to AAC panel substrates, both backed by a 7-year warranty when applied in accordance with the relevant technical specifications.

Aero Render: The Standard AAC System

Unitex Aero Render is the standard base coat for AAC panel work, applied by trowel over a Unitex Cembond primer coat. It’s engineered to bond reliably to AAC’s porous surface without the suction-related cracking that undermines standard renders, and it’s compatible with the full range of Unitex texture coatings — so builders and renderers aren’t locked into a single finish once the base coat goes on. For most AAC projects, from single-dwelling extensions to multi-unit developments, Aero Render is the specified starting point.

Fast-R Render: Built for Programme-Critical Sites

Where the project timeline is tight, Unitex Fast-R Render offers the same reliable AAC compatibility with a faster build-up designed to keep trades moving. It follows the same substrate preparation and Cembond priming sequence as Aero Render, then applies as a base coat suited to sites where reaching lock-up or finish stage faster matters — without compromising on the acrylic, non-combustible-family performance builders need for compliance sign-off.

Why Get the AAC System Right

Getting the render system wrong on AAC isn’t a cosmetic problem — it’s a warranty and compliance problem. Standard sand-and-cement render applied directly to AAC panels is a leading cause of on-site render failure, because the panel absorbs mix water faster than it can be replaced by curing chemistry. Both Unitex AAC systems are formulated around this specific behaviour, so builders and applicators get a system engineered for the substrate rather than adapted to it.

Unitex render systems are manufactured in Dandenong, Victoria, and have been since 1983 — more than 40 years of Australian manufacturing backed by a technical team with over 50 years of combined render experience. Every AAC system Unitex supplies carries the same accreditation rigour applied across the full product range, giving builders and specifiers the compliance confidence they need before work starts, not after a defect turns up.

Choosing Between Aero Render and Fast-R Render

Both systems are engineered for AAC panel substrates and share the same underlying Cembond-primed base coat approach. The right choice comes down to project programme and finish requirements — Aero Render as the standard specification, Fast-R Render where the build schedule is the deciding factor. The Unitex technical sales team can confirm the right system for a specific project, substrate condition, or finish combination.

Full Technical Specifications

Application method, coverage rates, drying times, and full process detail for each system are available on their dedicated specification pages: Aero Render System Specification and Fast-R Render System Specification. Both pages include the complete step-by-step build-up from substrate preparation through to protective top coat.

Get the Right System for Your AAC Project

For AAC panel projects anywhere in Australia, Unitex’s technical sales team can confirm the right system, review your plans, and provide a full quotation. Call 1800 RENDER, request a quote online, or view the full Base Coat Renders range to compare systems across all substrate types. You can also return to the System Specifications hub to compare options across other substrate types.