Steel substructure:

Bolted through the bottom chord:

  • Stainless steel screw with sealing washer ³ Ø 19mm
  • Non-positive connection between trapezoidal steel profile and substructure
  • High contact force possible to generate sufficient contact pressure of the washer with vulcanized-on neoprene seal
  • Inexpensive short stainless steel screws

Screw connection through the upper belt:

  • Stainless steel screw with sealing washer ³ Ø 19mm
  • Sufficient contact pressure, especially for sheet thicknesses £ 0.75mm difficult to reach, partial indentations (dents) at screwing points
  • If the screw connection is not tight, less water penetrates because it is outside the flow plane
  • Longer stainless steel screws cost more than those for lower belt mounting.

Screw connection through the upper belt with additional calottes:

  • Stainless steel screw with sealing washer ³ Ø 16mm
  • Two sealing levels
  • If the screw connection is not tight, less water penetrates because it is outside the flow plane
  • Ideal for inexperienced fitters and unsuitable tools, as the calotte as load distributor hardly allows any indentations (dents) at screw connection points
  • Greater pull-out force can be absorbed at the screwing point
  • Longer stainless steel screws and calottes cost more than with lower belt attachment

Wooden substructure:
Screw connection through the upper belt:

  • Stainless steel screw with sealing washer ³ Ø 19mm
  • Wooden purlins change their shape and twist with fluctuations in temperature and humidity, therefore no permanently secure fastening by the bottom chord is possible.
  • Sufficient contact pressure, especially for sheet thicknesses £ 0.75mm difficult to reach, partial indentations (dents) at screwing points
  • If the screw connection is not tight, less water penetrates because it is outside the flow plane

Screw connection through the upper belt with additional calottes:

  • Stainless steel screw with sealing washer ³ Ø 16mm
  • Two sealing levels
  • If the screw connection is not tight, less water penetrates because it is outside the flow plane
  • Ideal for inexperienced fitters and unsuitable tools, as the calotte as load distributor hardly allows any indentations (dents) at screw connection points.
  • Greater pull-out force can be absorbed at the screwing point.
  • Additional calottes cost additional

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