How and where to use guide
VELUX Twin and Combination Flashings 55x118cm EBW CK06 0021B
Typical applications and roof types
These flashings are designed specifically for pitched roof installations using traditional tiles or slates. The 55x118cm format suits CK06 window sizes, making them ideal for domestic and light commercial pitched roof projects. The dual-function design accommodates both single roof window installations and combination window setups, simplifying material planning and reducing on-site waste. They are not suitable for flat roofs or non-standard window sizes.
- Pitched roof tile installations
- Pitched roof slate installations
- Single and combination roof window configurations
- CK06 window size applications only
Installation and on-site practice
Installation must follow standard roofing practice and VELUX guidelines. The flashing should be positioned to integrate fully with the VELUX window frame, ensuring correct orientation before securing. Proper fixing is essential to prevent movement and water ingress. The flashing sits between the roof structure and the roof covering, creating a continuous seal. Ensure the window frame is square and level before installation, and check that the flashing sits flush against all edges of the frame. Secure fixing points must be made according to manufacturer instructions to prevent wind uplift and water penetration.
- Check window frame is square and level before installation
- Ensure correct orientation of flashing relative to roof pitch
- Secure fixing at all specified points to prevent movement
- Integrate flashing fully with VELUX window frame system
- Verify weathertight seal around entire window perimeter
Maintenance and durability
The aluminium and lead composite construction provides long-term durability and resistance to weather exposure. Periodically inspect the flashing and surrounding roof area to ensure the seal remains intact and no water ingress has occurred. Clear any debris, moss, or lichen from the flashing surface and roof tiles to maintain water drainage. Check that fixing points remain secure and that the flashing has not shifted or lifted. Address any signs of water staining or damp around the window frame immediately, as these indicate a compromised seal.
- Inspect flashing and seal annually, particularly after severe weather
- Clear debris and organic growth to maintain water drainage
- Check fixing points remain secure and flashing is not lifting
- Monitor for water staining or damp around window frame
- Address any damage or movement promptly to prevent water ingress
Limitations and important notes
This flashing is engineered for pitched roof applications only and is not suitable for flat roofs or non-standard installations. It is sized exclusively for CK06 window dimensions; using it with other window sizes will compromise the weathertight seal. The dual-function design simplifies logistics but does not allow customisation for non-standard configurations. Correct installation is essential; poor fixing or incorrect orientation will result in water ingress and potential structural damage. Always refer to VELUX installation documentation and follow local building regulations for roof window installations.
- Pitched roofs only; not suitable for flat roof applications
- CK06 window size only; incompatible with other dimensions
- Correct orientation and secure fixing are critical to performance
- Installation must comply with building regulations and VELUX guidance