Fixing and buying guide

Who this product is for

This flashing is essential for anyone installing a VELUX roof window or Sun Tunnel system on a slate roof. It is suitable for professional installers and experienced DIY customers undertaking new build or refurbishment work. If you are replacing an existing roof window or installing one for the first time, this flashing is a critical component for ensuring long-term weather protection.

Compatibility and sizing

The EDL FK04 2000 is engineered specifically for standard VELUX roof window ranges and Sun Tunnel systems. It is designed for roofs with 8mm slate profiles, which covers most traditional and contemporary slate installations in the UK. Before ordering, confirm that your VELUX window model is compatible with this flashing size and that your slate thickness matches the 8mm specification. Check your window documentation or contact VELUX technical support if you are unsure.

• Dimensions: 660 × 980mm
• Slate compatibility: 8mm thickness
• Material: Aluminium construction
• Suitable for VELUX roof windows and Sun Tunnel systems

Pre-installation checks

Before fitting, inspect the roof opening and surrounding slate to ensure they are clean, dry, and free from debris. Verify that the window frame is square and level, and that the opening dimensions match the flashing size. Check that all components of your VELUX window kit are present and undamaged. Ensure you have appropriate safety equipment and access arrangements in place, as roof work requires secure working at height.

• Confirm VELUX window model compatibility
• Check slate thickness is 8mm
• Inspect roof opening for cleanliness and level
• Verify all window components are present

Installation and weather protection

The aluminium flashing must be installed to create a complete weather-tight seal around the window frame. Follow the VELUX installation instructions carefully, ensuring the flashing sits correctly on the slate and that all joints are properly sealed. The flashing directs water away from the window frame and down the roof slope, protecting against water ingress. Proper installation is essential for long-term performance in UK weather conditions. If you are not confident in roof work, engage a qualified installer.