How and where to use guide
VELUX Twin and Combination Flashings 134x140cm EKN UK08 S0021E
Suitable applications and roof types
This flashing is designed exclusively for slate roofing with 8mm recessed profile. It is used to weatherproof the junction between compatible VELUX roof windows or Sun Tunnels and the slate roof surface. The flashing works as part of a coupled system, meaning it is typically installed with matching VELUX window or tunnel units. It is appropriate for both new build installations and refurbishment projects on properties with slate roofs.
- Slate roofs only – 8mm recessed profile
- Compatible VELUX roof windows and Sun Tunnel systems
- New build and refurbishment applications
- Creates weather-tight seal at roof penetration
Installation and on-site requirements
Installation of this flashing requires professional expertise to ensure a weather-tight finish. The flashing must be positioned to integrate with the slate roof profile and the compatible VELUX window or tunnel unit. Correct alignment and sealing are essential to prevent water ingress. The 1340 x 1400mm dimensions are fixed, so the roof opening must be prepared to match these specifications. All fixings and sealants must be appropriate for slate roofing and compatible with VELUX systems.
- Professional installation recommended
- Roof opening must match 1340 x 1400mm dimensions
- Flashing must align with 8mm recessed slate profile
- Use VELUX-approved fixings and sealants only
- Ensure water run-off is directed away from the installation
Maintenance and durability
The flashing is engineered for long-term durability in typical UK roof conditions. After installation, periodically inspect the flashing and surrounding slate for any signs of water ingress, debris accumulation, or movement. Keep the roof area clear of moss, leaves, and other debris that could obstruct water drainage. Do not attempt to modify or repair the flashing yourself; contact VELUX or a qualified installer if damage or leaks are suspected.
- Inspect flashing annually, especially after severe weather
- Keep roof area clear of debris and moss
- Check for water staining or damp inside the property
- Do not attempt DIY repairs – contact VELUX or a qualified installer if damage occurs
Limitations and compatibility
This flashing is designed only for 8mm recessed slate roofing and is not suitable for other roof materials such as tiles, asphalt, or standing seam metal. It must be used only with compatible VELUX roof window and Sun Tunnel systems; using it with other manufacturers' products may compromise the weather-tight seal. The fixed dimensions mean it cannot be cut or modified on site. Always verify product compatibility before ordering.
- Slate roofs only – not suitable for tiles or other materials
- Compatible with VELUX systems only
- Fixed dimensions – cannot be cut or modified
- Verify compatibility with your specific VELUX window or Sun Tunnel model before purchase