WPC Wall Cladding Flat 156 x 21 mm (1.861 kg/m) is the plainest board in the range and the easiest to live with. The face is completely flat - no pressed grain, no grooves - so a finished wall reads as one clean plane. Light falls evenly across it instead of being broken into light and dark bands by a texture, and the result is a modern, minimal, unfussy look. That flat face brings three practical advantages. The 156 mm face means fewer boards and fewer joints, the 21 mm 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 clean, unfussy wall that is easy to keep clean and can carry lettering and light fittings, the flat board is the one made for it.