When you change the roofs or walls of your structure, Tekla Structural Designer does not automatically update the changes to existing wind zoning. Updating the zoning is manual because you may wish to make more alterations before you recalculate the zoning.
Once you have completed your changes, incorporating them and recalculating the zoning details is simple. To reinstate the zoning after making changes, do the following:
On the Load tab, click Update Zones. The wind zoning calculations run in the background. Once the calculations are complete, Tekla Structural Designer views the new zoning layout for your structure.
Note: If you have defined your own zone layout for any roof or wall, the existing zones will be maintained when you make changes. Make sure to update these zones appropriately.