How and where to use guide
VELUX Twin and Combination Flashings 94x140cm EKL PK08 S0122
Typical applications and roof types
These flashings are specifically designed for use with VELUX rooflights and skylights where they penetrate pitched or flat roofs. The 94 x 140cm size suits standard roof window installations. They work on both traditional pitched roofs with slate, tile, or sheet coverings and on flat roof systems including felt, membrane, or asphalt. The flashing bridges the gap between the roof material and the window frame, directing water away from the building interior.
- Pitched roof applications with slate, tile, or sheet materials
- Flat roof installations with felt, membrane, or asphalt coverings
- Retrofit and new-build roof window installations
- Suitable for various architectural styles with available finish options
Installation and fitment
The adjustable clip system allows flexible positioning to accommodate different roof thicknesses and construction methods. Installation must follow the manufacturer's guidance and use suitable fixings appropriate to your roof type. The flashing sits between the roof material and the window frame, with clips securing it firmly in place. Proper alignment is critical to ensure the watertight seal functions effectively and water runs away from the window opening rather than pooling or entering the building.
- Position flashing between roof material and window frame
- Use adjustable clips to secure across varying roof thicknesses
- Select fixings suitable for your specific roof construction
- Ensure correct alignment before final fixing
- Follow all manufacturer installation instructions
Weather resistance and maintenance
These flashings are engineered to resist wind-driven rain and snow loads, meeting BS EN 12410:2011 standards for roof window flashings. The watertight seal depends on correct installation and regular inspection. After installation, check that the flashing sits flush against the roof material with no gaps or lifting. Periodically inspect around the window frame for any signs of water ingress, debris accumulation, or clip corrosion, particularly after severe weather.
- Inspect installation for gaps or misalignment before final sign-off
- Check clips and fixings annually for corrosion or loosening
- Clear any debris or moss growth around the flashing perimeter
- Look for water staining or damp patches inside the building below the window
Limitations and on-site considerations
These flashings are designed specifically for VELUX rooflights and skylights and should not be used with incompatible window systems. The 94 x 140cm dimensions suit standard roof window sizes; non-standard openings require different flashing sizes. Installation on damaged or deteriorating roof materials may compromise the seal and should be addressed before fitting. Ensure adequate roof ventilation is maintained and that the flashing does not obstruct any required air gaps or insulation layers.
- Use only with compatible VELUX rooflights and skylights
- Check roof structure and materials are sound before installation
- Do not install over damaged, wet, or unstable roof surfaces
- Maintain required ventilation gaps and insulation clearances
- Consult building control if uncertain about compatibility with existing roof system