How and where to use guide
VELUX Twin and Combination Flashings 55x98cm EKW CK04 S0122
Typical applications and suitability
These flashings are designed specifically for flat roof applications on timber-framed buildings. The 55x98cm dimensions make them suitable for larger roof areas where standard smaller flashings would be insufficient. They are compatible with structural timber grades C16 to C32, covering the range of common construction timbers used in UK building. The twin and combination flashing design allows integration with multiple roofing components to create continuous weatherproofing.
- Flat roof installations on timber-framed structures
- Larger roof areas requiring 55x98cm coverage
- Use with C16, C24 and C32 structural timber grades
- Integration with complete roofing systems for watertight sealing
Installation and on-site guidance
Installation of these flashings must be carried out as part of a coordinated roofing system installation. The flashings should be positioned to create a watertight seal at critical junctions where the roof meets other building elements. Proper alignment and securing are essential to ensure the flashing performs its weather-sealing function effectively. Installation should always be undertaken in conjunction with other roofing components and in accordance with the complete roofing system specification.
- Install as part of complete roofing system installation
- Position to create watertight seal at roof junctions
- Ensure proper alignment before securing
- Coordinate with other roofing components for continuous weatherproofing
Material durability and maintenance
The galvanised steel construction provides durable corrosion resistance suitable for long-term external exposure on UK roofs. Galvanising protects the steel from rust and weathering, extending the service life of the flashing. Periodically inspect flashings for any damage or separation from the roofing system, particularly after severe weather. Keep roof drainage clear to prevent water pooling around flashing areas.
- Galvanised steel resists corrosion and weathering
- Suitable for long-term external exposure
- Inspect periodically for damage or separation
- Maintain clear roof drainage to prevent water pooling
Weather protection performance
These flashings are engineered to resist wind-driven rain and snow ingress, providing essential protection for flat roof structures. The watertight seal created by proper installation prevents moisture penetration that could damage underlying timber structure or interior spaces. Performance depends on correct installation as part of the complete roofing system and on maintaining clear drainage pathways.
- Resists wind-driven rain penetration
- Protects against snow ingress
- Creates watertight seal when properly installed
- Prevents moisture damage to timber structure