Fixing and buying guide
VELUX Twin and Combination Flashings 114x118cm EKL SK06 S0122
Who needs this product and compatibility
These flashings are essential for anyone installing or replacing a VELUX roof window on pitched roofs. The twin flashing suits single-pitch roof applications, whilst the combination flashing is the versatile choice if your roof has both single- and double-pitch sections or if you need flexibility for future installations. The flashings work on both timber and concrete roof substrates, making them suitable for a wide range of residential and commercial roof constructions.
- Twin flashing: single-pitch roofs only
- Combination flashing: single- and double-pitch roofs
- Compatible with timber and concrete roof surfaces
- Size 114×118cm (47×46in) fits standard VELUX window openings
What is included and sizing
The 114×118cm flashing is sized to accommodate standard roof window installations at this specification. Grade SK06 indicates the flashing is engineered for this size range and roof load category. The corrosion-resistant EKL material ensures the flashing resists rust and degradation in wet conditions, which is critical for maintaining the watertight seal over many years of exposure.
- Single flashing unit per pack
- Dimensions: 114×118cm (47×46in)
- Grade SK06 for standard residential roof applications
- Corrosion-resistant EKL material throughout
Pre-installation checks and preparation
Before ordering, confirm your roof pitch type (single or double) to select the correct flashing variant. Measure your roof window opening to verify the 114×118cm size is appropriate for your installation. Check that your roof substrate is either timber or concrete, as these are the only supported surfaces. Inspect the roof area where the flashing will be installed to ensure it is clean, dry, and free from debris or old sealant that could compromise the watertight seal.
- Confirm roof pitch: single-pitch (twin) or single/double-pitch (combination)
- Verify roof substrate is timber or concrete
- Measure roof window opening against 114×118cm specification
- Clear installation area of debris and old sealant before fitting
Fixing and installation
The flashing must be installed in strict accordance with VELUX fitting instructions to ensure the watertight seal is achieved. The corrosion-resistant treatment protects the flashing itself, but correct installation is essential to prevent water ingress around the window perimeter. Ensure all fastening points are secure and sealed appropriately for your roof substrate type. The flashing should be fitted before the roof covering (tiles, slates, or other materials) is installed around the window opening.
- Follow VELUX installation instructions precisely
- Install flashing before roof covering is fitted
- Secure all fastening points appropriate to your substrate
- Seal all joints and edges to maintain watertight integrity