Abstract: Procedure for manufacturing a roof element wherein in the space between two sheets, that is, between a top and a bottom sheet (2,3), lagging material (1) such as polyurethane is foamed. It is only after foaming the lagging (1) that the folds (4,5) required for joining by machine are profiled by roller forming technique on the margins of the top sheet (2). The invention makes for faster and simpler manufacturing of the roof element. In comparison with procedures now in use, the cutting of the top sheet (2) from stock is simplified, the points of escape will be less, implying better quality, the manufacturing takes less time and continuous moulding, which presents the most efficient manufacturing method at the time, becomes applicable in this process in competitive and technologically sound production of these roof elements.