How the range
performs.
Wind, water, warmth and quiet — what a steel opening is asked to do in New Zealand, and how the range answers, suite by suite.
Figures we publish are
figures we can stand behind.
Performance figures by suite are drawn from the system catalogues behind our profiles and confirmed per opening on shop drawings — because a real number belongs to a real opening: its size, its glazing make-up, its wind zone. Where a suite's specification is still provisional, we say so on its page and publish nothing rather than something close.
External units are governed by wind zone — the majority of what we build sits under 2.7m × 1.2m per sash, with larger openings engineered case by case. Our frames are Steel Fabricator Certified (SFC) by Steel Construction New Zealand, and NZS 4211 performance data by suite is available when you enquire. Test documentation is available on request.
Steel is also simply stronger — see steel vs aluminium for what that means at the sightline.
By suite,
as published.
These are the suites with verified specifications today. The remaining suites are quoted with provisional figures, confirmed for your project when you enquire.
W20
The slimmest. Single-glazed.
W40
The everyday. Double-glazed.
W50 TB
Thermally broken. 50mm.
W75 TB
Maximum thermal. 75mm. Triple-glazed.
The performance story,
in three guides.
Thermally broken steel
What a thermal break is, why steel needs one, and how the three thermal suites step up — the performance flagship.
Steel vs aluminium
Real steel against steel-look aluminium — strength, sightlines and what the difference means for performance.
Heritage steel windows
Slim single-glazed steel for villas, character homes and internal screens — where sightlines outrank U-values.
Warmth is the question we're asked most, so it has its own range: the thermally broken suites run a cast-in isolator through the frame's centre line to close the cold path — the deeper the suite, the thicker the insulated unit it takes. For coastal sites, performance is a coating question as much as a glazing one: see finishes & hardware for the corrosion-protection process every unit gets.
Tell us the opening and the site — we'll name the suite.
Don’t wait. Plan ahead.
Steel joinery is complicated to make — every joint welded, ground and finished by hand. Bring us in early with your architect and the timeline takes care of itself. Specify it at the start, not the end.