ST70 HI+ Casement Window
Overview
The ST70 HI Casement window delivers strong performance, clean design and easy operation for modern homes and apartments. It brings commercial façade engineering into the residential sector, offering a reliable outward-opening window solution with excellent energy efficiency and long-term durability.
Thermal Performance
We design the ST70 HI Casement window to achieve high thermal insulation values. The system uses eco-friendly polyamides, foam cores and modern sealing technology to reduce heat loss and improve comfort inside the home. Depending on the glazing choice, this window can reach impressive thermal performance levels that support energy-efficient residential design.
Opening Options
The system is available in a range of outward-opening styles, including:
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Top-hung
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Side-hung
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Parallel sash options
These choices allow designers and homeowners to achieve the right balance between ventilation, appearance and ease of use. The window can be internally or externally beaded and includes multi-point locking for improved security.
Acoustic & Weather Performance
The casement design helps reduce external noise when paired with the correct glazing. It also offers strong weather resistance, ensuring reliable performance in exposed locations. The tested gaskets, seals and profiles help protect the home from wind, rain and changing conditions throughout the year.
Design Flexibility
The window features slim, modern sightlines that complement contemporary residential architecture. It integrates smoothly with the full ST residential range, allowing consistent design across homes, extensions and multi-unit developments.
You can choose from single or dual-colour options with durable polyester powder coating to Qualicoat standards. These finishes help match both interior and exterior design requirements.
Ideal Applications
The ST70 HI Casement (residential) window works well in:
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Multi-level apartments
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New-build housing
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Refurbishment projects
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Extensions
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Student accommodation
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Private homes
Its combination of clean aesthetics, efficient performance and easy operation makes it suitable for a wide variety of living spaces.
[Download the ST70 HI Casement Window Brochure]
For more information regarding our ST70 HI range, get in touch with us here.
- Whole window Uw value as low as 0.97Wm2/K (Triple Glazed)
- Tested to Pas 24 standards
- Fabricated using recycled aluminium and plastic materials
- Tested to EN12101 smoke ventilation
- Single or dual colour available
- Double or triple glazing up to 42mm in thickness
- New polyamides used in the window assembly
- Can be pre-assembled in-house saving installation time/cost
- Matching rebate doors available
- Identical sight lines throughout
- New foam core to increase thermal performance
- Includes multi-point locking for added security
| Frame Depth | 70mm | |
| EN ISO 1077-1 | Uw Whole window value: * | as low as 0.97 W/m²K |
| BS 6375-1:2009 | Air: | Class 4 |
| BS 6375-1:2009 | Water: | Class E1050 |
| BS 6375-1:2009 | Wind: | Class A5 |
| BS EN ISO 717-1 | Acoustic: | 60 dwb |
| BS 6375-2:2009 | Operating forces: | Class 1 |
| BS 6375-2:2009 | Mechanical strength: | Class 3 |
| BS 6375-2:2009 | Repeated opening & closing (30,000): | Class3 (Heavy Duty) |
| PAS 24:2012 | Security classification: | Certisecure |
*Whole window U values are a combination of the frame and glazing thermal performance and as such will vary with the specification of glass utilised. Please consult with the APA technical team for more specific performance information.
