Skid resistance scales are used to provide users an indication of the degree of slippage on a tiled surface. When assessing the requirements for your project, such factors as speed of traffic flow and environmental conditions should be considered. The slope of the surface and gravitational pull also has an impact on which tile surface will be optimal for your project.
The Ceramic Tile Institute identifies tile in the following three categories:
- Slip Resistant: Coefficient of friction is 0.60 or greater (wet). Meets or exceeds general safety and health regulations, ADA and OSHA requirements.
- Conditionally Slip Resistant: Coefficient of friction is 0.50 to 0.59 (wet). Meets or exceed general safety and health regulations and OSHA requirements.
- Questionable: Coefficient of friction less than 0.50
Logically the more textured a tile is, the less slippery it will be. Subsequently, polished or highly polished tiles are typically not recommended for high traffic areas or for residential sites with children and elderly people. The draw back on textured tile is that the greater the anti-slip finish on the tile, the more difficult it is to keep clean over an extended period.
Some tile manufacturers will use a rating system called DIN to determine the slip resistant nature of a given tile. Another set of information used to determine resistance is the DIN 51097 Set. This test is based on what is known as a ” Ramp Test ” and involves rating a surface in one of five groups. This test involves a process where the slop of the tile mount is gradually increased while being coated with motor oil and when the test subject walking in the tile begins to slip, it determines the slope / slippage rating for the surface. The value in degrees of the slope reached before they start slipping determines the classification of the material in class.
The Following is the DIN Rating Scale
- Rating R9 – Suitable for a less than 10° slope (minimal friction)
- Rating R10 – Suitable for a 10° to 19° slope (normal friction)
- Rating R11 – Suitable for a 19° to 27° slope (normal friction)
- Rating R12 – Suitable for a 27° to 35° slope (high friction)
- Rating R13 – Suitable for slopes more than 35° (very high friction)
Also, another DIN 51097 set classifies tiles from A to C for non-slip suitability. This test uses a soap solution instead of motor oil and participants are barefoot:
- Rating A – Suitable for slopes 12° to 17°
- Rating B – Suitable for slopes 18° to 23°
- Rating C – Suitable for slopes >24°
There is also a test referred to as the Pendulum Skid Resistance Test, which gives the following ratings for tiles:
- Rating <25 – Very slippery
- Rating 26-35 – Average
- Rating 35-65 – Good skid resistance
- Rating 66+ – Excellent skid resistance