How and where to use guide
VELUX Twin and Combination Flashings 55x78cm EBP CK02 0021B
Typical applications and installation
These flashings are primarily used to seal roof penetrations on pitched roofs where VELUX roof windows or similar roof-mounted installations meet the roof surface. The twin and combination design allows installation across a range of standard roof pitches and building configurations. The flashing sits beneath the roof covering above the window and overlaps the roof covering below it, creating a stepped weatherproof barrier that directs water away from the penetration.
- Install on pitched roofs with VELUX roof windows and similar roof penetrations
- Suitable for a range of standard roof pitches and building layouts
- Position flashing to overlap roof covering above and below the penetration
- Ensure the coated steel finish faces outward to shed water effectively
Weatherproofing and performance
The combination of FSC-certified timber and coated steel finish provides robust protection against wind-driven rain and snow on pitched roofs. The flashing design creates a watertight seal that prevents water ingress at the critical junction between the roof window frame and the roof surface. Proper installation is essential to maintain this weatherproofing performance.
- Resists wind-driven rain and snow penetration
- Coated steel finish protects against corrosion and UV exposure
- FSC-certified timber provides durability and environmental responsibility
- Watertight seal depends on correct positioning and secure fixing
On-site handling and maintenance
Handle the flashing carefully on site to avoid damage to the timber or coated steel finish. Store in dry conditions before installation to prevent moisture absorption. Once installed, the flashing requires minimal maintenance; however, inspect periodically to ensure the seal remains intact and the coated finish has not been compromised. Clear any debris or moss growth from the flashing surface to maintain water drainage.
- Store in dry conditions before installation
- Avoid dropping or dragging the flashing on site
- Inspect periodically for damage to timber or coated finish
- Clear debris and moss to maintain effective water drainage
Limitations and compatibility
The 55x78cm size is designed for standard roofing configurations; confirm compatibility with your specific roof window model and roof pitch before ordering. These flashings are engineered to integrate with VELUX roof windows and similar penetrations. Use only with pitched roof applications; flat roof installations require different flashing solutions. Ensure the roof covering material and installation method are compatible with the flashing design.
- Confirm size compatibility with your specific roof window model
- Suitable for pitched roofs only; not for flat roof applications
- Verify roof pitch falls within the range supported by combination design
- Ensure roof covering material is compatible with flashing installation