Tool 03 · Actions · EN 1991-1-4
Wind Load on Roofs
Peak velocity pressure and zone-by-zone uplift for duo-pitch, mono-pitch, trough and flat roofs — with the required steel roof ties — following the Danish national annex, exactly as in the NGH spreadsheet.
Danish national annex — the NGH spreadsheet basis. Nationally determined parameters update the working below.
Zone coefficients are interpolated between the NGH 5° table rows.
self-weight
wind
Steel roof ties
Pressure zones on the roof plan
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As in the NGH spreadsheet: loads from ceilings not directly connected to the roof are not included, loads from ceilings in the roof plane count as planar load, cpi = +0.2, and the stabilising effect of horizontal ceilings is disregarded. Ties are counted per zone area — always round up.