How and where to use guide
VELUX Twin and Combination Flashings 55x78cm EBL CK02 0021B
Typical applications and compatibility
This twin and combination flashing is engineered specifically for use with compatible VELUX roof window ranges and Sun Tunnel systems. It is suitable for both new build installations and refurbishment work on existing properties. The flashing accommodates standard roof tile and slate pitches found in typical UK residential construction. Always verify compatibility with your specific VELUX roof window model before ordering, as flashing dimensions and fixing requirements vary across the product range.
- New build roof window installations
- Refurbishment and retrofit projects
- Pitched roof applications with tile or slate coverings
- Compatible with VELUX roof window and Sun Tunnel systems
Installation and on-site guidance
The flashing must be installed as part of the complete roof window assembly to ensure a weather-tight seal. The 18mm slate gap support is designed to position the flashing above the roof covering, allowing water to drain naturally beneath it. Proper installation requires careful alignment with the roof window frame and secure fixing to the roof structure. The aluminium construction with weather-tight sealing provides reliable performance in UK roof conditions when installed correctly. Installation should follow VELUX technical guidance and building regulations for roof penetrations.
- Install flashing as part of the complete roof window assembly
- Position flashing to utilise the 18mm slate gap support for proper drainage
- Ensure secure fixing to roof structure and window frame
- Follow VELUX installation instructions and building regulations requirements
- Check all weather-tight seals are properly engaged before completing roof covering
Maintenance and durability
The aluminium flashing with weather-tight sealing is engineered to perform reliably in typical UK roof conditions. Periodically inspect the flashing and seals, particularly after severe weather, to ensure the weather-tight integrity remains intact. Clear any debris from the flashing surface and ensure drainage paths around the window remain unobstructed. The aluminium material resists corrosion when properly installed and maintained.
- Inspect seals and flashing condition annually
- Clear debris and ensure drainage paths are unobstructed
- Check for any signs of water ingress around the window frame
- Maintain weather-tight seals to prevent building envelope damage