How and where to use guide
VELUX Twin and Combination Flashings 114x118cm EBL SK06 0021B
Typical applications
These flashings are used on pitched roofs where building design or customer preference calls for multiple roof windows in close proximity. Common scenarios include master bedrooms with dual skylights, loft conversions requiring paired windows for balanced light distribution, or situations where a roof window must sit adjacent to an existing chimney, soil pipe, or ventilation duct. The dual-function design eliminates the need to source and fit separate individual flashings for each penetration.
- Twin window installations on pitched roofs
- Window combined with other roof penetrations
- Loft conversions and attic spaces requiring multiple light sources
- Retrofit projects where windows are positioned side by side
Installation and fitting
Before installation, confirm that your VELUX windows are SK06 format and that the roof pitch and covering are compatible with standard pitched roof flashings. The pre-formed profile is sized to fit the 114x118cm footprint, so measure your installation area carefully to ensure adequate space for both windows or the window and adjacent penetration. Position the flashing on the roof structure before laying tiles or slates, ensuring it sits flush against the roof deck. The weathertight seal depends on correct alignment and secure fixing to both the window frame and the roof substrate. Follow VELUX installation instructions for your specific window model, as flashing attachment points and sequence may vary.
- Verify SK06 window compatibility before ordering
- Measure installation area to confirm 114x118cm flashing fits both penetrations
- Install flashing before final roof covering is laid
- Ensure flashing sits flush and level on the roof deck
- Secure flashing to window frame and roof structure as per VELUX guidance
Weatherproofing and maintenance
The flashing's primary function is to create a weathertight seal at the junction between the window frame and roof surface. This seal is maintained by correct installation and regular inspection. After installation, check that all joints between the flashing and roof covering are properly sealed and that no gaps have opened due to roof movement or settling. In areas prone to heavy rain or snow, ensure that water can drain freely away from the flashing edges. Periodically inspect the seal around both windows or penetrations, particularly after severe weather, and reseal with appropriate roof sealant if any cracks or gaps appear.
- Inspect flashing seal annually, especially after storms
- Check for gaps between flashing and roof covering
- Ensure water drains freely away from flashing edges
- Reseal with roof-grade sealant if cracks develop
- Do not allow debris to accumulate around window frames
Limitations and on-site considerations
This flashing is designed for pitched roofs only and is not suitable for flat roof installations. The 114x118cm size is fixed, so it will not accommodate window spacings or penetration configurations outside this footprint. If your installation requires non-standard spacing or unusual roof angles, you may need to source alternative flashings or seek specialist advice. The flashing works with standard roof coverings but may require additional cutting or fitting if your roof uses unusual tile profiles or materials. Always check compatibility with your specific VELUX window model and roof covering type before purchase.
- Pitched roofs only; not suitable for flat roofs
- Fixed 114x118cm size; cannot be resized
- Requires compatible SK06 VELUX windows
- May need additional work with non-standard roof profiles
- Confirm roof covering compatibility before installation