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Reliable crown fixing with ORKAN storm washers

Mounting advice: This is how industrial roofs remain dry

Sandwich panels and metal sections for industrial lightweight construction are usually fixed to the crown or the valley flange of the respective substructure. Self-drilling screws or self-tapping screws are used as fastening elements. The screws feature sealing washers to ensure proper sealing of the joint..

When fastening to the valley, the correct fit of the sealing washer is of particular importance, since the assembly will be done in the water-bearing section. If the sealing washer is not installed properly, there is a risk of water damage, which is usually the responsibility of the contracting company.
To minimise the risk of water damage, EJOT recommends fastening to the crown, so that the penetration of the sandwich elements and metal profiles is not done in the water-bearing layer. Crown fixing should always be carried out in combination with ORKAN storm washers.

If ORKAN storm washers are omitted for the crown fixing, there is a risk that the crown will be dented and the roof may become leaky at these points. In addition, the static characteristics and the optical appearance of the roof cover are altered by the indentations.
Fixing with ORKAN storm washer


Fixing without ORKAN storm washer


The EJOT ORKAN storm washers also feature optimised reinforcement flanges to ensure high installation reliability as well as a force transfer into the profile bars. Indentation of the crown is almost impossible. On the underside, the ORKAN storm washers are fully lined with cellular rubber. This results in an additional sealing layer. In order to drill the hole in the centre of the crown, the storm washers should be used as drilling jigs.

The EJOT ORKAN storm washers are made of aluminium and corrugated ORKAN storm washers are available for trapezoidal and corrugated profile sheets. The coating is available in either mill finish, stucco or RAL colours.