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465 Secondary steel items on roofs in high winds
Report ID: 465
Published: Newsletter No 37 - January 2015
Report Overview
The reporter's firm routinely ensures that secondary roof items are tested by the manufacturer for the wind loads and rated accordingly.
Report Content
This reporter lives in the highest wind speed region in Australia where the working wind speed of over 250km/hour (70m/s, 155mph) and an ultimate speed of 316km/hour (90m/s, 196 mph). His firm routinely ensures that flashing, cappings, solar hot water heaters, ridge vents, skylights, satellite dishes and other appurtenances are tested by the manufacturer for the wind loads and rated accordingly.
They must then be fixed to the roof in accordance with the manufacturer’s recommendations and the engineer must ensure that the members they are fixed to can take the uplift loads. Roller doors and shutters and windows (including glass, frames and fixings) on walls are also areas of concern.
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This is the kind of engineering recommended in the comments on the previous two reports (461 Metal cladding panels blowing in the wind, and 462 Non-structural roof soffit linings – failure) where high, and uncertain, drag and uplift loads should be taken into account by the designer.
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