What is the minimum laying joint?

For grinded materials, a minimum joint of 2 mm must be respected, using the respective crosshead for a better alignment of the pieces.
For ungrinded materials, a joint corresponding to 2x the calibre must be used.
You may have to extend the minimum joint for specific applications, such as large surfaces, façades and terraces. In this case, the calculation of the joint should be done by a professional in the field.