Casement Double Glazed Windows

A popular window type on the Australian market, casement windows swing open like a door and are attached to the frame by one or more hinges on the side, top or bottom of the frame. Side-hung hinges are the most common type, but top-hung and bottom-hung options are also popular depending on property style.

Casement windows provide excellent ease of use and open with a crank handle that pushes the sash outward, as well as outstanding energy efficiency, with the sash pressing tightly against the frame to create a strong air compression seal.

Additional benefits to casement windows include their excellent ventilation properties – they can be opened fully to direct fresh air into internal spaces – their energy efficiency due to the airtight compression seal, which prevents drafts and helps lower energy costs, and unobstructed views. As these windows lack middle siding tracks or horizontal rails, they provide clear sightlines.

Yes, casement windows are particularly well suited to the Western Australian climate and, depending on the specific framing and glazing system, can be configured to meet BAL-12.5, BAL-19, and BAL-29 ratings. While it’s possible to meet BAL-40 or Flame Zone (BAL-FZ) ratings, strict size and design limitations apply and it may be preferable to choose another solution.

In terms of suitability for the climate in Perth and Western Australia, casement windows are a popular choice due to their strong benefits around ventilation, sealing and materials – these windows are highly effective at catching breezes, their secure compression seals pressed tightly against the frame to deliver superior air tightness and energy efficiency, and high-quality aluminium or UPVC frames deliver strong protection against coastal salt corrosion. 

As casement window sashes press directly against the frame, they provide superior energy efficiency and wind resistance compared to other window types, including sliding and double hung windows. While all windows with double glazing deliver strong energy efficiency, casement windows are particularly energy efficient as they use a crank and multi point locking system that pushes the sash flat against the weatherstripping, efficiently eliminating gaps. 

Additionally, the tight compression seal the crank and multi point locking system delivers significantly reduces air leakage compared with other window types. Casement windows not only deliver outstanding wind resistance, but actually perform more strongly in windy weather, as the wind pushes the sash even more firmly against the frame which enhances the seal. However, it’s important to note that there are structural limitations to leaving casement windows open in high winds.

Absolutely! Because the entire sash on casement windows swings completely outward, the window area in its entirety is open for airflow, acting like a vertical fan that intercepts external air and funnels it internally. Additionally, casement windows placed on the windward side of the house are highly effective at pulling fresh air across rooms. However, it’s important to understand that placement and house orientation are key to the effectiveness of casement windows in terms of directing natural breeze internally, and that they require physical space externally to open fully.

Yes, but they must meet specific child fall-prevention requirements. According to the NCC, if the floor below a bedroom window is 2 metres beneath, and the lowest level of the window opening is less than 1.7 metres above the floor, a restriction device or screen that meets specific opening and outward horizontal force specifications is required.