| 摘要 |
A roofing system includes a roof element (12) comprises upper (64) and lower (66) layers of a rigid strong sheet roofing material and includes a layer of insulating material sandwiched between the two layers. In lateral cross section, the element defines two generally planar beam sections (56) disposed either side of an integral central lower roof portion (62). The beam elements connect that central lower roof portion to two integral generally planar upper roof portions (52) extending along and defining each longitudinal edge of the roof element. The longitudinal edges of the roof element define connection means (72) for joining one such roof element to an adjacent roof element such that the join is located at the highest part of the joined elements in cross section.
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