Slip resistance

Decking boards made of wood WPC and plastic can become slippery outdoors due to fungal and algae infestation. The slip resistance of floor coverings is measured according to the DIN 51130 standard and categorized into slip resistance classes.

The scale ranges from R9 to R13. A terrace with slip resistance class R9 is slip-resistant up to an angle of inclination of 6°-10°. Decking boards in slip resistance class R13 are slip-resistant up to an angle of inclination of 35°. For commercial and public areas, decking boards with a slip resistance class of R11 to 13 should be used. The slip resistance class test method is not yet widely used.

Therefore, no reliable test results can be found for most woods. However, decking boards made of tropical wood are generally less slippery than decking boards made of larch or spruce, as these are much more susceptible to fungi and rot. In addition, smooth decking boards are less slippery than grooved boards, as the wood with grooves dries less easily and is therefore also more susceptible to fungi and algae.

Source: https://de.wikipedia.org/wiki/Rutschsicherheit