ST70 HI+ Casement Window
The ST70 HI Casement window system is the newest thermally improved option from APA Façade Systems. It builds on the original ST70 HI design but now uses updated polyamides and foam cores. Because of these upgrades, the system reaches whole-window Uw values as low as 0.98 W/m²K, giving you strong thermal performance.
The system comes in several opening styles. These include top hung, side hung, tilt and turn, and parallel sash. You can choose internal or external beading to match the project. In addition, every style includes multi-point locking, which strengthens security and supports larger sash sizes. This gives designers far more flexibility on complex elevations.
The ST70 HI Casement also offers strong durability. It meets strict BS/EN standards for weather tightness and sound insulation. A UKAS-approved test facility confirmed all performance results. Because of this, the system works well for multi-level residential buildings and commercial projects that need reliable long-term performance.
The system also supports a wide range of glazing options. You can choose double or triple glazing depending on the required thermal performance, acoustic level or design needs. As a result, the ST70 HI Casement is a practical and energy-efficient solution for both new builds and refurbishments.
You can view the product brochure below:
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.
Northwood Nursing Home, Dublin
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