Wind suction

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Wind suction is the force of a wind flow on surfaces as a result of the Bernoulli effect . It is technically significant in particular on parts of buildings such as facades and roofs .

Cause: The air pressure of the still air inside the building or within the component itself (typically: insulation materials) is higher than the air pressure in the air flowing past. Where the wind flow separates at the building edges, suction-intensifying eddies form.

To avoid wind suction damage, the components must be designed in such a way that they can safely absorb the wind loads and associated forces. Information on this can be found in the relevant standards such as DIN 1055-4 and Eurocode 1991-1-4.

For roofs, the “Technical rules of the German roofing trade” are also applicable - the publisher is the Zentralverband des Deutschen Dachdeckerhandwerk e. V. in Cologne - to be observed as recognized rules of technology . If these and the measures specified in the standards for wind suction protection are not observed, the responsible building insurance company may reduce or reject the damage in the event of storm damage .