Fixing and buying guide
VELUX Twin and Combination Flashings 55x118cm EKW CK06 0021E
Who this product is for
This combination flashing suits professional installers and competent DIY customers installing dual VELUX roof windows. It is not suitable for single window installations or where windows are spaced differently than 100mm apart. You should have experience with roof work, understanding of profiled roofing systems, and familiarity with flashing installation before attempting this project.
- Trade roofers and experienced DIY installers
- Projects requiring two roof windows in close proximity
- Profiled roofing installations only
Compatibility and sizing
This flashing is engineered for VELUX roof windows positioned exactly 100mm apart, measured between the outer frames. It fits profiled roofing materials with a depth up to 120mm, covering standard corrugated and metal profile sheets commonly used in UK construction. The 55 × 118cm dimensions are fixed and designed to span both windows and the gap between them. Before ordering, confirm your roof pitch does not exceed 120mm and measure the exact spacing between your window positions.
- Frame spacing must be 100mm between windows
- Profiled roofing depth maximum 120mm
- Fixed dimensions 55 × 118cm
- Measure roof pitch and window positions before purchase
What is included and pre-installation checks
You receive one combination flashing unit ready for installation. Before fitting, verify that both roof window frames are correctly positioned 100mm apart and that your profiled roofing material depth does not exceed 120mm. Check that the roof pitch is suitable and that the flashing dimensions align with your window layout. Ensure the roof surface is clean and free from debris, and that you have appropriate safety equipment for working at height.
- One combination flashing unit supplied
- Confirm 100mm spacing between window frames
- Check roofing material depth is within 120mm limit
- Clean roof surface before installation
- Use appropriate fall protection and safety equipment
Installation and maintenance
Install the flashing according to VELUX instructions, ensuring it sits flush with both window frames and creates a continuous watertight seal across the profiled roofing. The maintenance-free exterior finish requires no painting, sealing, or ongoing treatment after installation. Periodically check that debris has not accumulated around the flashing edges, particularly after severe weather, but no routine maintenance is needed.
- Follow VELUX installation instructions precisely
- Ensure watertight seal across both windows
- No painting or sealing required after installation
- Clear debris from flashing edges as needed