Fire Rating
Sketch Australia's thin natural stone veneers hold an NCC Group 3 classification under AS 5637.1-2015, based on cone calorimeter testing to AS/NZS 3837-1998 by AWTA (Test No. 23-003447, issued September 2023). This supports use as interior wall coverings across a wide range of building classes — confirm the specific requirements for your project with your building certifier.
Certificate summary
| Assessment | Group Number Assessment, AS 5637.1-2015 |
| Test method | AS/NZS 3837-1998 (cone calorimeter, heat and smoke release) |
| Testing body | AWTA (accredited Australian laboratory) |
| Test number | 23-003447 · issued 12/09/2023 |
| Product | Thin/flexible stone veneer, 2–3 mm, 100% metamorphic stone face |
| Result | NCC Group Number 3 |
| Average specific extinction area | 326.4 m²/kg |
What Group 3 means for your project
The National Construction Code (NCC) groups wall and ceiling lining materials from Group 1 (highest performance) to Group 4. Group 3 materials are accepted for interior wall linings in many residential and commercial applications. The specific limits depend on your building class, the location within the building (for example, fire-isolated exits have stricter requirements) and whether the building is sprinkler protected.
Share the certificate with your building surveyor or certifier — or call our team on 1300 632 166 and we'll assist with compliance documentation for your project.
Flexible tiles
Fire testing for our flexible tile range is currently underway with an accredited Australian laboratory. Contact us for the latest certification status.
To request the full AWTA Group Number Assessment certificate for your project records, call 1300 632 166 or use our contact page.