Steel-trapezoid substructures - ideal for hall building roofs

Steel trapezoid substructures can be implemented in a wide variety of situations and used either as a façade material, or as a cost-effective and durable roof covering. In hall building construction, steel trapezoid based structures are used as roofs for steel-structured hall buildings, but other types of hall building also lend themselves to the installation of this roof type.

Constructing a roof from steel - stability in layers


Roofs built from steel-trapezoid structures are primarily used in industrial and commercial construction and are especially well-suited to hard-constructed roofs. The structures are essentially composed of the following layers, from outer- to innermost:

  • Roof membrane
  • Thermal insulation
  • Vapour barrier
  • Steel-trapezoid supporting structure

The individual layers combine to form a cohesive system which is viewed, particularly from the perspective of fire protection, as single unit. As a load-bearing roof shell, the substructure boards must be sufficiently sized and correctly affixed. The safety standard in roof construction is determined by the mechanical engineering method in use, the degree of utilisation, and the building’s intended storage use. To guarantee fire protection, and because steel trapezoid structure boards are considered a regulated construction product at delivery, in accordance with industry standard DIN 18 807, the boards must be treated with a fire protection galvanised layer and an anticorrosive coating.

Affixation and other construction factors


Given the favourable mechanical engineering conditions and the larger reserves involved, steel-trapezoid supported roof structures should preferably be constructed as through-flow systems. So that the trapezoid structure cannot slide out of place, appropriate protrusion at the end-of-row supports must be observed. The boards are affixed at the end-of-row and mid-row supports, as well as on the cross beams and at all beam crossing points. Fire protection is also taken into consideration here: the joints must be impermeable to all fluids in order to prevent secondary fire ignition. It is equally important to ensure that the structure blocks the passage of steam. Where this is not guaranteed by the roof substructure itself, an additional vapour barrier must be built in.

Steel-trapezoid supported roofs can be implemented at a minimal roof pitch of 2 degrees. The many and varied construction possibilities range from single-leaf, non-isolated roofs for machinery halls, through to isolated and ventilated roofs for exhibition halls or car showrooms. Simply get in touch with us. We will gladly advise you on all your questions concerning the use of steel-trapezoid supported roof structures.

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