Flush aluminium casement windows with slim 45mm sashes
The Sieger Flush Casement Window is an ultra-minimal aluminium window system designed for projects where clean lines, slim framing and strong performance are all essential. With a flush design, 45mm sash and a wide range of opening configurations, it brings a refined aluminium finish to modern homes, listed buildings, replacement glazing projects and architect-led developments.
The system is fully weather tested, thermally broken and certified to PAS 24 and Secured by Design, giving homeowners, architects and developers a window system that looks understated while performing to a high standard.
Sieger Systems supplies and installs slim aluminium flush casement windows across London, Buckinghamshire, Berkshire, Oxfordshire, Hertfordshire, Surrey, Bath, Bristol and Somerset.
Premium performance
Bespoke made to order
Designed & made in the UK
PRODUCT FEATURES
Sieger flush casement window features
Slim 45mm sash
Flush frame design
Secure performance
Flexible configurations
To learn more about additional features:
Technical performance
| Sash width | 45mm slimline sash |
| Maximum opening sizes | Top hung: 1400mm x 1200mm | Side hung: 700mm x 1400mm |
| Glass specification | Typical 4mm / 18mm argon gas cavity / 4mm glazing unit |
| Weather performance | Air Class 4, water 9A and wind E2400 |
| Security | PAS 24 and Secured by Design certified |
| Acoustic performance | Rw 42dB acoustic rating |
GLASS OPTIONS
- Double glazed units
- Argon gas filled glazing
- Acoustic glazing options
- Solar control glass
- Low-E insulated glass
- Laminated safety glass
- Switchable tinted glass
- Heated glass
