How and where to use guide
VELUX Twin and Combination Flashings 66x118cm EKL FK06 0021E
Typical applications and suitability
This flashing is engineered for pitched roof installations where a 66x118cm VELUX roof window needs to be fitted. It works with standard tile and slate roof coverings, making it suitable for most domestic and light commercial pitched roof projects. The integrated design makes it particularly useful where simplified installation and reduced labour time are priorities. It is not suitable for flat roofs or windows of different dimensions.
- Pitched roof installations only
- Compatible with tile and slate roof coverings
- Sized exclusively for 66x118cm VELUX windows
- Suitable for new builds and replacement projects
Installation and on-site guidance
Before installation, ensure the roof opening is correctly sized and prepared to VELUX specifications. The twin and combination design means the upper and lower flashing components work as a single integrated unit, simplifying the fitting sequence compared to separate flashing pieces. Position the flashing carefully around the window frame, ensuring it sits flush with both the roof structure and the tile or slate covering. Proper sealing and securing of the flashing is critical to prevent water ingress at the roof line. Follow VELUX installation instructions precisely, as correct positioning of the integrated components is essential for weathertightness.
- Check roof opening dimensions match 66x118cm specification before starting
- Install the integrated flashing unit as a complete assembly
- Ensure flashing sits flush with roof structure and covering
- Secure and seal according to VELUX guidance to prevent leaks
- Work carefully around the window frame perimeter
Maintenance and durability
Once installed, the flashing requires periodic inspection to ensure the seal remains intact and no debris has accumulated around the window opening. Check that tiles or slates remain properly seated around the flashing edges, particularly after severe weather. The integrated design minimises maintenance points compared to separate flashing systems, but the seal between flashing and roof covering should be inspected annually. Clear any moss, leaves, or dirt that could trap moisture and compromise the weathertight seal.
- Inspect annually for damage or deterioration
- Clear debris and moss from around the flashing
- Check that roof tiles or slates remain properly seated
- Verify the seal between flashing and roof covering is intact
Limitations and important considerations
This flashing is designed exclusively for 66x118cm VELUX windows on pitched roofs with tile or slate coverings. It cannot be used with different window sizes, flat roofs, or alternative roof materials. The integrated twin and combination design is optimised for standard pitched roof angles; unusual roof pitches or complex roof geometries may require specialist assessment. Proper installation is essential; incorrect fitting will compromise weather protection and may lead to water ingress into the building.
- Not suitable for windows larger or smaller than 66x118cm
- Pitched roofs only; not for flat roof applications
- Tile and slate roofs only; not compatible with other coverings
- Installation must follow VELUX specifications precisely