Joint Requirement: Must be installed with a minimum 3mm = 1/8” joint due to the extruded nature of the tile. Installation without joints is not possible. Tile Structure: Each piece has three parts - two convex and one concave. Option 1: Install all pieces in the same direction, creating a repeating pattern of Convex, Convex, Concave. Option 2: Alternate the direction of each piece to create a varied pattern.