R11 vs R12 Slate Pool Tiles: Which Do You Need?

Slip resistance ratings (R-values) are the most important specification for pool areas. Here is what they mean in practice.

The Rating Scale

R9 is minimum grip, R13 is maximum. Most residential pool surrounds need R11 minimum; public and commercial pools require R12-R13.

Natural Cleft vs Honed

Natural cleft slate provides R12-R13 naturally. Honed slate is smoother (R10-R11) and suits indoor areas.

Australian Standards

AS 4586 governs slip testing in Australia. Natural cleft slate passes R12-R13 without any surface coatings.