The accessories, also called special parts, have a specific technical role for a good realization of the roof. They can also simply be intended to enhance the aesthetics and embellishment of the roof. Terreal and its brands strive to offer a very complete range of products, enabling the creation of an all clay roof, a guarantee of longevity and aesthetics. These wide ranges also allow roofing companies to practice "dry laying", which avoids the use of mortar. For top-of-the-range tile models such as flat tiles and canal tiles, traditional mortar laying is encouraged. It is facilitated by a range of traditional accessories: the professional roofer then expresses all his know-how: "cock's crest" finishes for the ridge, special cutting of the edges, of certain rows of tiles along the ridge.