Source google image: https://image.slidesharecdn.com/typedetoitureterrasseettanchit-170325192612/95/type-de-toiture-terrasse-et-tanchit-37-638.jpg?cb=1490470071
Toiture terrasse inaccessible definition
Source google image: https://image.slidesharecdn.com/typedetoitureterrasseettanchit-170325192612/95/type-de-toiture-terrasse-et-tanchit-37-638.jpg?cb=1490470071