Fixing and buying guide

Who this product is for

This flashing is for builders, roofers, and serious DIY installers fitting a 78x140cm VELUX roof window on a pitched roof. You will need this flashing whether you are installing a new window or replacing an existing one. It is not suitable for flat roof installations or windows of different dimensions.

Compatibility and sizing

This flashing is sized exclusively for 78x140cm VELUX roof windows. Check your window dimensions carefully before ordering. The EDL MK08 Standard flashing works with tile, slate, and sheet roof coverings on pitched roofs. Confirm your roof material and pitch angle are within standard installation parameters. The flashing integrates with standard VELUX window frame systems, so verify your window frame type matches VELUX specifications.

• Window size: 78x140cm only
• Roof types: Tile, slate, and sheet materials
• Installation: Pitched roofs only
• Frame compatibility: Standard VELUX window frames

What is included and pre-installation checks

Before installation, inspect the flashing for damage and ensure all components are present. Check that your roof structure is sound and the opening is correctly sized and positioned for a 78x140cm window. Verify that the roof covering around the installation area is in good condition and that you have adequate access and working space. Ensure you have the correct VELUX window frame ready for installation, as the flashing must align precisely with the frame perimeter.

• Inspect flashing for damage before fitting
• Confirm window opening dimensions match 78x140cm
• Check roof structure is sound and level
• Verify roof covering condition around installation area
• Have VELUX window frame ready for alignment

Installation and fixing

Careful alignment is critical for weathertight performance. Position the flashing to integrate fully with the VELUX window frame, ensuring the perimeter seal is complete. The flashing must direct water away from the window and into the roof covering. Follow VELUX installation guidance for your specific roof material, as tile, slate, and sheet installations have different fixing requirements. Secure the flashing firmly to prevent movement and ensure all joints are sealed properly to maintain long-term weatherproofing.