Zeus Double Hung Windows — The Period-Home Vertical Slider
The double hung is the traditional window for period Melbourne homes — weatherboard and Victorian frontages especially. Zeus is our system for it, and because its tested ratings drop a full class when exposed, this is one range where we're particularly careful with siting.
What it is and where we use it
Two sashes sliding vertically, giving ventilation without the sash swinging into the room or projecting outside — which also makes it a practical choice over paths and walkways where an awning sash can't project. It takes a 135-degree bay coupler, so period-style bay windows are available in this range.
Wind rating and tested performance
Our Zeus double hung tested to N3 in non-exposed positions — both general and corner — and N2 where the window is exposed. Serviceability was 600 Pa positive and 1200 Pa negative, with ultimate at 1400 Pa positive and 2000 Pa negative, and 200 Pa water resistance.
The exposed and non-exposed distinction genuinely matters on this one, since it drops a full class. For a double hung going into an unprotected wall we'd want to check the site classification carefully, and if the site needs N3 exposed we'd look at a different system.
Energy performance and glazing options
Double glazed, Zeus double hung certifies between Uw 3.1 and 4.2 depending on the glazing make-up — much the same band as the Zeus slider, so the choice between them is proportion and look rather than energy.
Sizes and configurations
Single openings, multi-light runs, and bays via the 135-degree coupler. As across our range, sash weight governs maximums — double glazed sashes are significantly heavier, and we size against the balance hardware before quoting.
What we'd recommend it for
Period renovations and extensions where the vertical proportion is the point, on reasonably sheltered elevations. For exposed walls needing N3 or better, we'd steer the schedule item to an awning system and keep the double hungs where they're protected.