How and where to use guide
VELUX Twin and Combination Flashings 78x98cm EKW MK04 S0222
Typical applications and installation location
This flashing is used on pitched roofs where dual skylights or combined VELUX units require a single integrated weathertight seal. The flashing sits at the junction between the skylight frame assembly and the roof surface, bridging the gap between two side-by-side units or supporting a combination configuration. It is suitable for use with both traditional roof tile and slate finishes. The 78x98cm size is designed for specific VELUX skylight models, so verify compatibility with your exact skylight dimensions and model numbers before ordering. Installation should be planned during new roof construction or significant re-roofing work to ensure proper integration with the roofing material.
- Dual skylight installations positioned side by side
- Combined or multi-unit skylight configurations
- Pitched roof applications with tile or slate finishes
- Critical weatherproofing junction between skylight frames and roof deck
Installation and alignment
Correct installation depends on precise alignment with the roof pitch and existing roofing material. The flashing must be positioned so that water naturally drains away from the skylight frames and down the roof slope. The aluminium and rubber seal components work together to create a weathertight barrier, so both elements must be properly seated and secured. Ensure the flashing is aligned square to the roof pitch and that all edges are fully supported by the roof structure beneath. The installation sequence typically involves positioning the flashing before laying roof tiles or slates around it, allowing the roofing material to overlap the flashing edges in the correct water-shedding direction.
- Verify roof pitch compatibility before installation
- Align flashing square to the roof slope
- Ensure rubber seal components are fully seated
- Overlap roofing material correctly to shed water downslope
- Secure flashing according to VELUX installation instructions
Maintenance and on-site considerations
After installation, inspect the flashing regularly to ensure the rubber seal remains intact and free from cracks or deterioration. Check that roof tiles or slates around the flashing edges remain properly seated and have not shifted, as movement can compromise the weathertight seal. Clear any debris, moss, or lichen growth from the flashing surface and surrounding roof area, as these can trap moisture and reduce the effectiveness of the seal. If the rubber seal shows signs of hardening, cracking, or separation from the aluminium frame, the flashing should be replaced to maintain weatherproofing. Avoid walking directly on the flashing or placing heavy loads on it during maintenance work.
- Inspect rubber seal regularly for cracks or deterioration
- Keep flashing and surrounding roof area clear of debris and moss
- Check that roof tiles or slates remain properly seated around edges
- Replace flashing if seal shows signs of hardening or separation
- Avoid placing weight directly on the flashing during maintenance
Limitations and compatibility
This flashing is designed specifically for the EKW MK04 model and compatible VELUX skylight units of the specified 78x98cm size. It is not suitable for flat roof installations or for single skylight applications where a standard single flashing would be appropriate. The flashing is designed for pitched roofs only and may not perform correctly on roofs with unusual pitches or non-standard configurations. Always confirm model and size compatibility with your VELUX skylights before purchase, as using an incorrectly sized flashing will compromise the weathertight seal and may result in water ingress and structural damage.
- Designed for pitched roofs only, not flat roof applications
- Specific to EKW MK04 model and compatible VELUX units
- 78x98cm size must match your skylight configuration
- Not suitable for single skylight installations
- Verify compatibility before installation to prevent water ingress