How to use a National Annex in EN1991-1-4

The EN1991-1-4 standard for the calculation of the wind pressure on structures allows the personalization of some parameters and formulas according to the information in National Annexes.

You can choose from the following options:

• Generic

• Austria

• Belgium

• Czech Republic

• Finland

• France

• Germany

• Netherlands

• United Kingdom

• Slovakia

• Ireland

• Poland

• Slovenia

• Greece

• Romania

For the National Annexes of United Kingdom and Ireland, it is necessary to unlock and manually input, according to the requirements of the standar, the value of "Exposure factor".