Surface performance changes over time, and between batches. Passing an AS 4663–2013 test last year doesn’t guarantee compliance today.

If the floor has been sealed, re-polished, cleaned differently, worn down, or replaced with a new batch of product, the slip resistance can be very different.

Australian Standards make it clear: a slip resistance certificate is only valid for the specific batch tested. Even if the product’s style, manufacturer, size, and finish are identical, a different production batch requires its own test. Minor manufacturing variations can change the microtexture enough to shift the P-rating.

We regularly see surfaces drop 1–2 P-ratings due to:

• High foot traffic
• Changed cleaning chemicals
• New sealers or finishes
• Outdoor exposure and surface breakdown
• Variation between manufacturing batches

WHS obligations require safe surfaces to be maintained, not just tested once. Periodic retesting provides proof you’re actively managing risk, and batch-by-batch testing ensures product certificates are valid.

Suggested retest frequencies:

• Shopping centres / retail foyers: 6–12 months
• Schools and aged care: annually
• Surfaces treated or coated: test post-treatment and again within 12 months
• Each new batch of product: test before installation

Zerofal makes retesting straightforward. We track your previous results, flag at-risk areas, and clearly identify if new tests are needed for replacement or additional batches.