4. Presentation of the different interlocking clay roof tiles

4.1 Relief interlocking clay roof tiles

The installation of these tiles is covered in NF DTU 40.21 P1-1 (October 2013) "Travaux de bâtiment – Couvertures en tuiles de terre cuite à emboîtement ou à glissement à relief – Part 1-1: Cahier des clauses techniques types".

These interlocking relief tiles (figure 14 ) are the most widely manufactured and used clay tiles in France, from north to central France, not forgetting the Rhone corridor and the Mediterranean coast. There was a huge variety of these tiles, with over a hundred different models of "lozenge" tiles alone.