MCRMA - Online CPD - Guidance Document GD15: Guidance for wind loadings in roof and wall cladding

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This online CPD, approved by the CPD Certification Service, provides an introduction to the principles and practical considerations involved in calculating wind loads on metal roof and wall cladding systems. It emphasises that wind is one of the most critical forces acting on a building envelope and, if not properly accounted for, can lead to damage, loss of performance, or even structural failure. CPD points are awarded on completion of an online questionnaire at the end.

The CPD covers how wind interacts with buildings, creating both positive pressure and suction forces on different parts of the roof and façade. It highlights that cladding fixings, and the supporting structure must all be designed to safely resist these loads, particularly where suction forces rely on the integrity of fasteners and connections.

A significant focus within the CPD is placed on the many factors that influence wind loading – these include site location, altitude, proximity to the sea, surrounding terrain, building height, shape, orientation and position on the building envelope. These variables mean that wind loads are always site- and building-specific, requiring individual assessment for each project.

The calculation process is also outlined, which uses recognised standards such as BS EN 1991-1-4 (Eurocode), including determining wind speed, converting it to dynamic pressure, and applying pressure coefficients to different building zones. The CPD also explains the role of internal pressures and how these combine to give the final design load.

Finally, the CPD covers practical design considerations, including use of software, specification of cladding and fasteners, treatment of high-load zones, and the impact of additional features such as photovoltaic panels. Overall, it provides a clear framework for understanding and applying wind load design in metal cladding systems.