External Wall Cladding and the Building Code in Queensland

Every external wall on a new home has to meet the National Construction Code. In Queensland, state building rules and the building certifier sit alongside it. Knowing who decides what saves arguments late in a job.

This is a plain guide to how the pieces fit. It does not replace advice from your certifier, who has the final say on compliance for each building.

What the National Construction Code does

The National Construction Code is published by the Australian Building Codes Board. It sets performance requirements that buildings must meet. For external walls, those requirements cover things like keeping water out and the behaviour of materials in a fire.

The code does not name one correct cladding. It sets the outcomes a wall must achieve, and there is more than one way to show that.

The ways a wall can comply

In broad terms, a building can meet the performance requirements in two ways:

• A Deemed-to-Satisfy Solution, which follows the prescriptive provisions in the code
• A Performance Solution, which shows by other means that the requirements are met

Some buildings use a mix of both. Either way, the certifier needs evidence that the chosen materials and systems are suitable for how they are being used.

Evidence of suitability

Evidence of suitability is how a product shows it can do the job. It can take several forms, such as certificates, test reports and other documentation set out in the code.

For cladding systems, this is where the manufacturer's documents matter. Keep the current technical manual and any certificates for the system on file, and check that the building matches the scope they describe.

Where Queensland rules come in

Queensland adds its own requirements through state legislation and the Queensland Development Code. Your certifier applies these together with the national code. Local council requirements can also affect some sites.

If a site has special conditions, such as bushfire exposure, those need to be worked out early. They can change which cladding systems are suitable.

The builder, the certifier and the renderer

Each party has a part to play:

• The designer and builder choose a system suited to the building
• The certifier decides whether the evidence shows compliance
• The installer builds the system the way its documentation requires

As installers, our job is to install the specified system correctly and keep records of what went in. We do not sign off compliance, and we will tell you if a detail on site does not match the system documents.

Practical steps before cladding goes on

• Confirm the cladding system with the certifier during design
• Get the current system documentation from the supplier
• Check the details at openings, slab edges and roof junctions
• Keep photos and delivery records during installation

The Australian Building Codes Board publishes the code and guidance material free online.

Send the drawings through our project portal or call 0452 295 212, and we will price the job.