Slip Resistance of Wood Decks

Generally, wood decks are rather slip resistant, particularly when wet. Tables 11.1, 

and 11.4 list some quantitative data. According to Table 11.1, leather shoes on wood deck show the static coefficient of friction of 0.3-0.4 (depending on type of wood) when dry no data were available in the cited source regarding wet surface. 

However, when tested using ASTM F 1679 (the Variable Incidence Tribometer procedure), CCA pressure treated southern yellow pine showed slip index of 0.92 (dry wood) and 0.88 (wet wood) [ICC-ES Legacy Report NER-682], which is generally higher than slip resistance of WPC materials (Table 11.3). 

The above data are supported, in kind, by other data in Table 11.3, which systematically compares slip resistant of different composite and plastic deck boards along with pressure-treated lumber deck board. 

Overall, it appears that pressure-treated lumber is less slippery than composite deck boards, and wet wood is less slippery than dry wood. 

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