How and where to use guide
VELUX Twin and Combination Flashings 55x118cm EBP CK06 0021B
Typical applications and roof types
These combination flashings are designed for pitched roof installations where VELUX roof windows or products require weatherproofing at the roof interface. They are suitable for use on roofs with timber grades F16 or higher and can also be integrated with metal roofing systems. The flashings accommodate complex roof angles and curves, making them suitable for both straightforward and more challenging roof geometries. They are typically used in conjunction with other VELUX products as part of a complete roof window installation system.
- Pitched roof installations with VELUX roof windows
- Roofs with complex angles and curves
- Timber-framed roofs with F16 grade or higher
- Metal roofing systems
- Domestic and commercial pitched roof applications
Installation and positioning
The flashing must be positioned at the junction between the VELUX window frame and the roof covering to create a continuous weathertight seal. Correct alignment is critical to ensure wind-driven rain and snow cannot penetrate behind the flashing. The 55 x 118cm dimensions are designed to overlap appropriately with roof tiles or slates above and below the window opening. Installation should follow VELUX guidance specific to your roof covering type, as fixing methods and overlap requirements vary between tile, slate, and metal systems.
- Position flashing at the window-to-roof junction before installing roof covering
- Ensure adequate overlap with tiles, slates, or metal sheets above and below
- Align flashing squarely with the window frame
- Secure flashing according to VELUX installation instructions for your roof type
- Check alignment before fixing roof covering over the flashing
Material specification and durability
The flashing is manufactured from galvanized steel with PVC coating and powder coat finish, providing robust protection against corrosion and weather exposure. The galvanized steel base offers structural strength and durability, whilst the PVC and powder coat layers protect against rust and UV degradation. This construction ensures long-term performance on exposed roof surfaces. The material is compatible with timber grades F16 or higher, confirming suitability for standard structural roof timbers.
- Galvanized steel construction resists corrosion
- PVC coating provides additional weather protection
- Powder coat finish protects against UV and weathering
- Compatible with F16 and higher timber grades
- Suitable for metal roofing systems as well as traditional tile or slate
On-site handling and maintenance
Handle the flashing carefully during transport and installation to avoid denting or damaging the coating, which could compromise weatherproofing. Once installed, the flashing requires minimal maintenance beyond routine roof inspection. Check periodically that the seal remains intact and that no debris has accumulated at the window-to-roof junction. If the roof covering is replaced or repaired, ensure the flashing is not disturbed and that any new covering is properly overlapped and secured according to the original installation specification.
- Avoid dropping or denting the flashing during handling
- Inspect the seal annually as part of roof maintenance
- Clear debris from around the window-to-roof junction
- Do not remove or reposition the flashing without professional guidance
- If roof covering is replaced, ensure flashing remains undamaged and properly overlapped