On flat roofs, different zones are subject to different wind loads. These include corner, edge, and central zones. The dimensions and wind pressure in each zone are calculated through a wind load calculation. IKO offers this calculation as a supportive and free service via the IKO website.
A wind load calculation helps determine the type and pattern of fixings for the roof build-up in each zone, ensuring sufficient resistance against the wind forces acting on the roof. Corner and edge zones are often exposed to higher wind loads. In these areas, additional mechanical fixings or extra ballast layers may be required. Consult your IKO advisor for project-specific recommendations.
Key Consideration
- The wind resistance compatibility of different layers in a roof system is determined by wind box tests. Based on these test results, IKO can provide validated design values confirming that certain roofing materials are compatible and meet the wind load resistance requirements.
- IKO manufactures complete flat roof systems, where the compatibility of all components (primers, vapour control layers, adhesives, insulation, waterproofing membranes) can be demonstrated through official test reports.
- If you choose to use alternative adhesives, the respective manufacturer must provide proof of compatibility with both the underlying and overlying layers.
- For Indoor Climate Class IV, mechanical fixings through the vapour control layer are not permitted.
For more information, refer to our guide “Everything About Installing PIR Insulation on a Flat Roof”, available on the IKO website.