40 lantern rooflight overview
The Sieger 40 Lantern Rooflight is a slimline aluminium roof lantern designed to bring more natural light into premium homes, extensions and architectural developments. With 40mm frame profiles, thermally broken aluminium construction and bespoke sizing, it creates a bright, open feel while maintaining the structural and thermal performance required for modern building projects.
Designed for homeowners, architects, developers, builders and trade buyers, the 40 Lantern Rooflight can be specified for projects across London, Buckinghamshire, Berkshire, Oxfordshire, Hertfordshire, Surrey, Bath, Bristol and Somerset.
Premium performance
Bespoke made to order
Designed & made in the UK
PRODUCT FEATURES
40 Lantern rooflight features
40mm slimline framing
Ultra slim 40mm aluminium frames maximise the glazed area and reduce visible structure across the roof opening.
Thermally broken aluminium
Thermally broken aluminium framing helps reduce heat transfer and improve the insulation of the roof lantern.
Custom made configuration
Each lantern is made to suit the project size, glass specification, pitch and required tie bar arrangement.
Engineered tie bar options
No tie bars, hidden tie bars or rafter tie bars can be specified depending on the width and structural requirements.
To learn more about additional features:
Technical performance
| Sightline | 40mm slim aluminium framing |
| Thermal performance | Uw values from 0.7 W/m²K |
| Maximum size | Up to 5m wide, with almost unlimited length |
| Snow loading | Up to 1.4 kN/m² |
| Glass specification | Up to 24mm insulated glazing, with triple glazing options |
| Frame colours | Black, white or grey as standard, with dual colour options |
GLASS OPTIONS
- Standard double glazed units
- High performance double glazed units
- Triple glazing
- Solar control glass
- UV protection glass
- Argon gas insulating cavity
- Switchable tinted glass
- Heated glass
Real projects
View our products in action.
