How safe are your windows in heavy winds?
With severe winds hitting the South-Eastern coast of Australia recently, you might wonder, “How strong are my windows in heavy winds?” Wind loads on buildings can be powerful and are one of the biggest challenges any structure faces. It’s crucial that your windows and doors can withstand these forces to keep you and your loved ones safe.
In Australia, every construction site must be assessed based on AS/NZS 1170.2 for Wind Actions or AS4055 Wind Loads for Housing. These standards ensure that windows and glazed doors are tested for performance and durability. AS4055 focuses specifically on houses and similar residential structures. Part of this process includes determining the correct N-rating, which specifies the wind resistance needed for your windows based on local conditions.
N-ratings, or Wind Ratings, are part of the Australian Standard AS4055, which classifies wind loads on housing. These ratings help ensure windows and doors are strong enough for their location. Here’s a summary of the common N-ratings:
Wind load is calculated by considering both wind speed and wind pressure. Wind speed is the velocity of air moving past stationary objects, while wind pressure is the force exerted on a structure by the moving air.
Though related, wind pressure focuses more on how air velocity interacts with different shapes. Different parts of the same building may experience different wind pressures with the same wind speed. When choosing windows, it’s important to consider both wind speed and wind load.
The short answer is you shouldn’t. Calculating wind loads is complex and should be done by qualified professionals—builders, engineers, or architects. This assessment should happen during the design phase to ensure all relevant forces are considered when determining the required window strength. Professionals will conduct various tests, including:
These tests will ensure your windows and doors perform well under different wind loads.
Talk to your architect, engineer, or builder to choose the right windows for your home and region. Then, contact the experts at Southern Star Windows & Doors for the best Canterbury Timber or Southern Star Aluminium options for your new home or renovation.
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