Fig. (13) The Outer Roof uses the special purlin (11) in order to be suspended from the Inner Roof. External rafters (13) are placed every 35 to 50 cm and overhang the walls by 50 to 60 cm. On top of them, small purlins (14) are nailed approximately every 10 cm, to hold the coming flat roof tiles. The covering is completed by placing a series of angle- shaped tiles over the top edge of the roof. (M. Pelekanos). [13].