How and where to use guide
VELUX Twin and Combination Flashings 94x140cm EKN PK08 S0021E
Suitable applications and roof types
This flashing is specifically designed for slate tile roofs where VELUX roof windows or Sun Tunnel systems are being installed. The 8mm recessed design allows the flashing to sit flush with slate tiles, creating a visually consistent roof finish. It is suitable for standard roof pitches and works with both new build construction and refurbishment projects where existing roof structures are being modified to accommodate roof windows or ventilation systems.
- Slate tile roofs only—not suitable for other tile types without specialist advice
- Compatible with standard VELUX roof window and Sun Tunnel ranges
- Suitable for new build and refurbishment applications
- Designed for typical UK roof pitches and weather conditions
Installation and coupling system
The flashing uses a recessed coupling system that integrates with compatible VELUX roof window or Sun Tunnel frames. The 8mm recess depth is engineered to allow the flashing to sit neatly between slate tiles without protruding above the roof surface. Installation must be carried out as part of the complete VELUX window or system installation, following the manufacturer's detailed instructions. The flashing dimensions of 940×1400mm are fixed and must match the compatible window or system size. Proper installation is critical to ensure the weather-tight seal functions correctly and maintains roof integrity.
- Install as part of complete VELUX roof window or Sun Tunnel system
- Follow VELUX installation instructions precisely for weather-tight performance
- 8mm recess allows flush integration with slate tiles
- Dimensions are fixed at 940×1400mm—verify compatibility before ordering
- Ensure all coupling points are fully secured and sealed
Weather protection and maintenance
The flashing provides a weather-tight seal that prevents water ingress around the roof window or Sun Tunnel opening. Once installed correctly, the recessed design minimises standing water and debris accumulation on the roof surface. Regular inspection of the flashing perimeter is recommended, particularly after severe weather, to ensure the seal remains intact. Any debris or moss growth around the flashing should be carefully removed to maintain drainage and prevent water pooling. The flashing itself requires no routine maintenance beyond visual inspection.
- Inspect the flashing seal annually and after severe weather
- Clear any debris or moss growth around the flashing perimeter
- Do not apply sealants or coatings unless specified by VELUX
- Ensure roof gutters and drainage remain clear to prevent water backup
Limitations and on-site considerations
This flashing is designed exclusively for slate tile roofs and cannot be used with other roof covering materials without specialist guidance. It is a coupled system component and must be ordered and installed as part of a complete VELUX roof window or Sun Tunnel installation—it cannot function as a standalone product. The fixed 940×1400mm dimensions mean it is only compatible with specific VELUX window sizes; verify the product code and dimensions match your roof window or system before purchase. Installation requires careful roof opening preparation and should be carried out by experienced installers familiar with VELUX systems.
- Not suitable for use with tile types other than slate
- Must be installed as part of a complete VELUX system
- Fixed dimensions—confirm compatibility with your specific roof window
- Installation should be carried out by experienced builders or roofers
- Do not attempt to modify or adapt the flashing for non-standard applications