WPC Wall Cladding Straight Grain 168 x 21 mm (2.2 kg/m) is the most design-led board in the range, and the widest. At 168 mm it has the broadest face we make: covering one square metre takes only 5.95 m of board, 7.2% less than a 156 mm board and nearly a sixth less than a 140 mm one. Joints fall by the same margin, so there is less to line up, fewer trims to close and less labour, and the wall is broken up less often - from a distance it reads closer to one continuous sheet of finish. A 168 mm face with 21 mm of thickness keeps each board stiff and the joints flat, and the hollow chambers add thermal and sound insulation. Outdoor performance is unchanged: it takes in no water, so it will not rot, split, host insects or grow mould; UV-stabilised so the colour will not bleach; no paint and no wax, ever. For a wall whose proportions you want to tune with line, on the widest face and with the fewest joints, the 168 mm straight grain board is the one made for it.