Importance

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Abstract

A roof panel (1) for use in forming a low pitch or flat roof comprises a profiled inner liner or decking sheet (2), an outer waterproof membrane (3) and a body (4) of insulation between the inner liner (2) and outer membrane (3). The membrane liner sheet (3) has a backing such as a fleece or scrim to aid adhesion of the membrane (3) to the foam body. The membrane (3) comprises a side lap (5) extending sidewardly of at least some of the marginal edges of the body (4). The inner liner (2) comprises joint formations for forming a nested side lap joint between adjacent panels. The joint formations comprise a first joint formation (20) at one edge of the liner (2) and a second joint formation (21) on an opposite edge of the panel. The first and second joint formations (20, 21) of adjacent panels are adapted to interengage on assembly and are clinched together using a clinching tool (22) to form a clinched joint (25). The first joint formation (20) comprises a liner extension which is shaped to define a recess. There is an inturned liner leg and a return leg which define the liner recess therebetween. The second liner formation (21) comprises a liner extension which is shaped to define a projection which is engagable in the recess defined by the first liner extension (20). The liner projection is defined by an inturned liner leg which has a return lip to reinforce the projection. On assembly of adjacent panels on site, the liner formations (20), (21) are inter-engaged ed and clinched together. A foam filler (30) is provided at the joint.

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First Claim