| 摘要 |
A roofing sheet comprises a projecting corrugation (11, 12) at each one of two opposite side edges. One corrugation (12) is adapted to be positioned over the opposite corrugation (11) of an adjacent sheet (10), so that several sheets (10) can be positioned adjacent each other with the corrugations (11, 12) overlapping and holding each other. One flange portion (13) of the lower corrugation (11) is provided with a groove (15) and the other flange portion (14) is provided with a support portion (16). One flange portion (20) of the upper corrugation (12) is provided with a rib (22) and the other flange portion (19) is provided with a portion (21) adapted to bear on the support portion (16). The rib (22) is adapted to engage in the groove (15), so that the rib and the groove form a hinge. In that way, a sheet having an upper corrugation can easily be turned around a lower corrugation, until a tight contact has been provided between the corrugations. The free edge of the upper corrugation can be bent outwards or inwards to form the hinge. |
