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Steel Windows
The slimmest visible geometry and high rigidity, in profiles with industrial character
Three Forster systems, from an internal profile with no thermal break to an external frame with Uw below 1.0 W/m²K
Slim structural steel profiles
Steel has the strength to carry tall sashes on profiles only a few centimetres wide. It is the language of industrial architecture and the technical answer where other materials would need heavier sections
Onde faz sentido
Steel complements timber and aluminium when a project calls for exceptionally slim profiles, high stability, security ratings or very large glazed areas
Partitions and interior glazingVery slim steel profiles to separate offices, rooms and circulation areas while keeping transparency and daylight
Facades and large openingsFacade systems, windows and doors with high stability, large glass areas and visually light profiles
Entrances and securityRobust entrance doors with security locking and tested anti-intrusion configurations, including RC2 or RC3 depending on the system and build-up chosenWith or without a thermal break
The choice depends on where the window goes: indoors a thermal break is unnecessary; outdoors it is what separates a handsome window from an efficient one
InteriorForster Presto, 50 mmNo thermal break, for partitions, interior glazing and technical doors. The finest grid possible
ExteriorForster Unico and Unico XS, 70 mmIntegrated thermal break, three seals and Uw from 0.98 W/m²K, for facades and large openingsSKLO technical note: in external openings, steel without a thermal break will condense. If the window faces the street, the Unico version is mandatory
Finish and protection
Steel profiles can take a range of surface treatments, chosen according to the application, the exposure and the language of the project. Corrosion protection and the final finish are specified case by case
Powder coatedAn even finish in selected RAL colours, in matt, satin or textured versions. Preparation and paint system are matched to the exposure conditions
Acabamentos especiaisBronze tones, metallics or bespoke effects bring a new window close to the language of a historic facade. Availability is confirmed project by project
Galvanizado a quenteZinc protects the steel against corrosion and creates an expressive metallic surface. A durable solution for demanding external applicationsTalk to a specialist
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Galvanised and powder-coated steel has a lower coefficient of thermal expansion than aluminium and holds the geometry of the sash over decades. That is why it remains the choice for industrial-architecture refurbishment and architect-led work
Other ranges
Steel is the choice for slim profiles and reinforced security. For higher insulation, or for refurbishment in timber, look at these ranges
Wooden Windows
Laminated timber from certified species, finished in any RAL or NCS colour, made in our own factory
Aluminium Windows
Slim sections for wide openings, with thermal breaks specified to the system and the calculation
PVC Windows
High thermal and acoustic insulation, simple maintenance and a controlled budget