Fixing and buying guide

What this product is and who needs it

This is a tile flashing specifically engineered for VELUX roof window and Sun Tunnel installations on pitched tile roofs. It is essential for any builder, surveyor, or serious DIYer installing VELUX products into a tiled roof, as it provides the critical weather seal between the roof window frame and the surrounding tiles. The coupled recessed design means it can support twin window installations or combination setups where you are fitting multiple VELUX products side by side.

Compatibility and sizing

This flashing is compatible with VELUX roof windows and Sun Tunnel systems only. The 780×1400mm dimensions and MK08 designation indicate it is sized for a specific VELUX window or combination configuration. Before ordering, confirm your roof window model and that you require a coupled (twin or combination) flashing rather than a single window flashing. Check your VELUX installation documentation or product specification sheet to verify the correct flashing code for your application.

• Compatible with VELUX roof windows and Sun Tunnel systems
• Coupled recessed design for twin or combination window installations
• Dimensions 780×1400mm with 90mm recess depth
• Designed for standard pitched tile roofing

Pre-installation checks and preparation

Before fixing, inspect the flashing for any damage in transit and check that the 90mm recessed profile is clean and free from debris. Verify that your roof structure and tile layout can accommodate the 780×1400mm footprint and that the surrounding tiles are in good condition. Ensure you have the correct VELUX roof window frames ready for installation, as the flashing must be fitted in coordination with the window installation sequence. Have the VELUX installation manual to hand, as flashing installation is a critical step in achieving a weather-tight seal.

• Check flashing for transport damage before installation
• Confirm roof structure can support the 780×1400mm footprint
• Inspect surrounding tiles for damage or poor condition
• Have VELUX window frames and installation documentation ready
• Plan the installation sequence to fit flashing and windows together

Installation and weather performance

The coupled recessed profile is engineered to sit flush with your tile roof, creating a neat finish that sheds water reliably in typical UK roof conditions. The 90mm recess allows tiles to overlap the flashing edges, providing multiple layers of weather protection. This flashing supports professional multi-window installations, so if you are fitting two or more VELUX products, this coupled design maintains visual continuity and structural integrity across the installation. Follow VELUX's fixing guidance carefully to ensure the flashing is secured correctly and sealed to prevent water ingress.