Abstract: A lightweight construction, especially a greenhouse structure, comprises a plurality of pillars (12) arranged at the periphery of an area of said lightweight construction, said pillars (12) extending obliquely and outwardly so that an upper end (22) of said pillars (12) lies substantially in a vertical plane passing through a respective area border. According to the invention at least one of said pillars (12) comprises a supporting element (14), said supporting element being mounted onto said pillar (12) so as to define a predetermined inclination angle of said pillar (12).

Abstract: A Method for roofing a lightweight construction, comprises the steps of fastening a prefabricated trellis of metal wires to an upper frame of said light-weight construction, so that said trellis spans over an area of said lightweight construction, and putting a sheeting material on said trellis.

Abstract: In a housing cover, particularly a valve cover for an internal combustion engine, having a seal surface extending around its circumference at one side thereof with a seal structure molded onto the seal surface, deformable projections are formed on the side opposite the seal surface for engaging the housing cover by a tool when the seal is molded onto the seal surface.