The anti-slip myth busted
Grooved boards are a quirk of the UK Market. They became popular in the late 1990s as many people just liked the look of them but they were originally marketed as anti-slip and even though it transpired not to be true , the terminology stuck creating a myth that just lingers on. So yes we agree 100%, the grooves DO NOT add extra grip.
When the grooves are fitted face up, in the direction of a slight fall (as recommended by TDCA) they will channel water away from the deck to prevent standing water. Another feature of a grooved deck board is that the fixings are ‘hidden’ in the sunken ridges.
However if you require a robust anti-slip solution, ideal for steps and ramps and public access decks or playgrounds, there are many great products on the market which are purposely designed for this application in both grooved and smooth profile designs – such as factory applied aggregate strips and specialised coatings.