Fixing and buying guide

What this product is and who needs it

This is a coupled recessed tile flashing—a specialist component that sits between a VELUX roof window or Sun Tunnel and the roof tiles beneath it. It is essential for anyone installing or replacing a compatible VELUX roof window or Sun Tunnel system. The flashing creates the weather-tight seal that prevents water ingress around the window opening. It is suitable for both new build installations and refurbishment work on existing properties.

Compatibility and sizing

This flashing is designed for use with standard VELUX roof window and Sun Tunnel ranges. The 940×1400mm dimensions (with a 90mm recess depth) are specific to the PK08 size category. Before ordering, confirm that your VELUX window or Sun Tunnel is a PK08 model and that you require a twin or combination flashing rather than a single flashing. Check your window documentation or product code to verify compatibility.

• Product code: EKJ PK08 S0021E
• Dimensions: 940×1400mm
• Recess depth: 90mm
• Suitable for PK08 compatible VELUX windows and Sun Tunnels only

Pre-installation checks

Before fitting, inspect the flashing for any damage in transit and ensure the roof opening dimensions match the flashing specification. Verify that the roof tile profile and pitch are compatible with recessed flashing installation. Check that all components of your VELUX window or Sun Tunnel system are to hand and match the flashing size. Ensure you have appropriate roofing tools and safety equipment for working at height.

• Confirm roof opening size matches 940×1400mm flashing dimensions
• Check roof tile type and pitch are suitable for recessed installation
• Verify all VELUX window or Sun Tunnel components are present
• Inspect flashing for transport damage before installation

Installation and performance

The coupled recessed design integrates the flashing with the roof tiles to create a seamless, weather-tight seal. Installation must follow VELUX guidance to ensure the flashing performs correctly in UK weather conditions. The recessed profile sits flush with the roof plane, providing a neat finish that minimises visual disruption. Once correctly installed as part of the complete VELUX system, the flashing requires minimal ongoing maintenance and delivers reliable long-term durability.