The case for thermally broken steel is straightforward: the material has no equal for strength and character, and a proper thermal break means it no longer has to apologise for energy performance either.

The Forge makes that case without needing to argue it. A 25mm visible profile width and 80mm system depth give it the structural integrity to handle large openings and high wind loads, while U-values down to 1.1 W/m²K put it alongside the better-performing aluminium systems on the market without any of the visual compromise. Multi-point locking, angled glazing and compatibility with double and triple insulated units up to 27mm complete a system that’s genuinely built for demanding external conditions.

Maximum sash dimensions of 1000mm × 2800mm cover most residential and light commercial applications. Bespoke glazing bars applied and structural are available for projects where the visual character of the frame matters as much as its performance.