Fixing and buying guide

What this product is and who needs it

This is a combination flashing unit that serves dual functions in a single component. It is essential for anyone installing a VELUX roof window on a pitched roof where weatherproofing around the window frame is critical. The flashing prevents water from penetrating the roof structure at the point where the window frame meets the roof tiles or slates. It is suitable for both new installations and replacement window projects on pitched roofs with standard rafter spacing.

Sizing and compatibility

The 78x140cm dimensions are sized for standard rafter spacing on pitched roofs. Before purchasing, confirm that your VELUX window model is compatible with the EBW MK08 flashing type. Check your window documentation or the VELUX compatibility chart to ensure this flashing matches your specific window size and model. The flashing must align correctly with both your roof pitch and rafter positions to function effectively.

• Width: 78cm
• Length: 140cm
• Model: EBW MK08
• Verify VELUX window model compatibility before ordering

Pre-installation checks and preparation

Before fitting, inspect the flashing for any damage or defects. Measure your roof opening carefully to confirm the 78x140cm size matches your rafter spacing and window frame dimensions. Check that your roof pitch falls within the range this flashing is designed for, as incorrect pitch alignment will compromise the weathertight seal. Ensure you have all necessary fixings and sealants to hand, and review the installation instructions specific to your VELUX window model.

• Confirm roof pitch compatibility
• Verify rafter spacing matches the 78x140cm flashing size
• Inspect flashing for damage before installation
• Gather all fixings and sealants required for your window model

Installation and weather protection

Careful alignment is essential for effective weather protection. The flashing must be positioned to manage water run-off correctly, with the upper edge tucked under roof tiles or slates and the lower edge overlapping the tiles below. Proper sealing around the window frame perimeter is critical to prevent water ingress. Follow the detailed installation guidance provided with your VELUX window, as the flashing works as part of a complete weatherproofing system. Incorrect installation will compromise the seal and may lead to water damage.