Aluminium Windows
58BW ST HI WindowSlim, Sleek, Secure Steel Replacement Windows.
Get the steel look with all the advantages of aluminium – a perfect choice for both designers and homeowners. Our 58BW ST HI aluminium windows offer top-tier build quality, making them an excellent alternative to traditional steel windows. Combining outstanding thermal and acoustic efficiency, these windows maintain the slim sightlines of steel while delivering enhanced durability, performance, and security.
Choose Options
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58mm or 70mm frame depth to accommodate varying types of applications
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Internally or externally glazed
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Glazing 24mm – 36mm
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Available for Lifetime Homes (LFT)
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Available in a range of single or dual colour and anodised finishes
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Available in the following aesthetics: Bay, Heritage and Contemporary
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Available in the following configurations: top hung, bottom hung, side hung, fixed light, multi-light and French casement
58BW ST HI Aluminium Windows Features
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Certified under the Secured By Design scheme
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PAS24 and SBD Certified Options
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Green guide rated A
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Integrated deep head profiles for ease of trickle ventilation
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Unique polyamide thermal break design to improve thermal performance
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Fully accredited by industry standards
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Eco-friendly materials and production
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Sleek and contemporary styling
KS59 Ultra-Slim Window System
The KS59 casement window system combines sleek, ultra-slim aluminium sightlines with modern design features, making it a standout choice for both residential and commercial properties. With a sightline of just 70mm, it maximizes the glazed area, offering a clean, contemporary aesthetic. Available in three sash design options and two outer frames, the KS59 caters to a variety of architectural styles, from minimalistic modern looks to heritage or crittall-inspired designs.
This versatile window system provides all the benefits of aluminium—durability, enhanced thermal and acoustic efficiency, and superior performance—while maintaining the slim profile typical of steel windows. The 58BW ST HI aluminium windows, in particular, offer the ideal solution for those seeking a steel-like appearance with the added advantages of aluminium, including improved security and lower maintenance.
Overall, the KS59 offers a cost-effective, fabricator-friendly solution with a timeless, elegant design that’s perfect for both designers and homeowners looking for quality and style.
KS59 Ultra-Slim Window System Aluminium Windows Features
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Three sash design: flat, stepped or chamfered
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Two outer frame options: flush or standard
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U-value as low as 1,4 W/m2K
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Top and side hung applications
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Mechanical corner cleats or crimping cleats
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Wide range of solutions: 90º angle
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adjustable bay pole, 20 or 40 mm flush add ons, cills, coupler sections
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Sleek and contemporary styling
| Air permeability* | Class 4 |
| Water tightness* | Class 9A |
| Wind load* | Class C5 |
| Thermal insulation Uw** | Up to 1,4 W/m2K |
* Air/Water/Wind tests according to standard BS6375-1
** Please note: U-Values are dependant on size and glass U-Values. The above are based on a 3 panel door and glass U-Values of 1,1 W/m2K.
Maximun size (top hung): 1200×1500 mm
Maximun size (side hung): 600×1200 mm
Maximum weight: 50 kg
Maximun glazing: 28 mm
Polyamide: 24/32 mm
PAS 24 Security
Air, wind and water tested to BS6375-1
Design
KS59 is an oustandingly versatile aluminium system with an ultra-slim sightlines of only 70 mm to maximise glass areas. It provides a large range of sashes and frames design combinations to create stylish and contemporary looks to both new build and refurbished projects. Available in two different design choices: with a stylish and contemporary casementaesthetic, or a new flush frame.
Features
On sites where security and strength are paramount, KS59 system is ideal as tests PAS 24:2012 and BS6375-2-2009 demonstrate.
These important characteristics give confidence when dealing with education and commercial sites where durability is a key consideration.
Benefits
The KS59 window has been tested in accordance with BS6375-1 2015 for Air, Water and Wind resistance, making it an ideal choice for exposed or remote sites.
Possibilities
KS59 gives versatility thanks to its wide range of sections which include flat, stepped or chamfered options allow for the creation of a spectrum of styles, ranging from modern and minimalist aesthetics to heritage and industrial casement designs. This aluminium system provides an extensive array of accessories and complements, encompassing Georgian bars, cills, trickle vents, bay pole, 90º corner, and flush add-ons of 20 and 40 mm.
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