How and where to use guide
VELUX Recessed Flashings W/ Installation Productions 78x98cm EDJ MK04 2000
Typical applications and suitability
This flashing kit is intended for pitched roof installations where a VELUX roof window or Sun Tunnel system of 780×980mm opening size needs to be integrated neatly into the roof line. It is suitable for both new build work, where the roof structure and tiles are being installed around the window opening, and refurbishment projects where an existing window is being replaced. The recessed design ensures the window sits flush with the surrounding roof tiles, creating a professional appearance and avoiding the visual prominence of a raised flashing collar. The system is engineered to perform in typical UK roof conditions and maintains a weather-tight seal to protect the building interior from water ingress.
- New build pitched roof installations with compatible VELUX roof windows or Sun Tunnel systems
- Refurbishment and replacement projects on existing roof openings
- Roofs with standard UK tile profiles where 90mm flashing depth is appropriate
- Projects requiring a neat, integrated roof line finish
Installation and on-site preparation
Before installation, ensure the roof opening is accurately sized to 780×980mm and that the surrounding roof structure is sound and level. The flashing kit should be installed in sequence with the roof window frame and tiles. Position the tile flashing around the window opening, ensuring it sits securely on the roof battens or structure beneath. Use the BDX 2000F installation components as supplied to fix the flashing and create the weather-tight seal. Tiles should be laid over the top edge of the flashing and under the bottom edge to create a continuous, overlapping weather barrier. All fixings must be secure and the seal around the flashing perimeter must be complete before the roof is considered weather-tight. Follow VELUX installation documentation supplied with the kit for detailed step-by-step procedures.
- Check roof opening dimensions are exactly 780×980mm before commencing work
- Ensure roof structure and battens are level and secure
- Install flashing in correct sequence with window frame and roof tiles
- Use all BDX 2000F components as supplied for weather-tight seal
- Overlap tiles correctly over and under flashing edges
- Verify all fixings are tight and seal is complete before declaring installation finished
Limitations and maintenance
This flashing kit is sized specifically for 78×98cm openings and is not suitable for other window dimensions. The 90mm tile flashing depth is designed for standard UK roof tile profiles; non-standard or very thick tile systems may require alternative flashing solutions. Once installed, the flashing requires no routine maintenance beyond general roof inspection. Periodically check that tiles remain secure around the flashing perimeter and that no debris or moss has accumulated in the flashing channels, as this could impede water drainage. If the roof window or flashing is damaged, do not attempt temporary repairs; contact VELUX or a qualified installer for professional assessment and replacement.
- This kit is for 78×98cm openings only; do not use for other window sizes
- 90mm flashing depth is for standard UK tile profiles
- No routine maintenance required beyond periodic visual inspection
- Check tile security and clear any debris from flashing channels annually
- Do not attempt repairs to damaged flashing; seek professional advice