Fixing and buying guide

What this product is and who needs it

This is a purpose-engineered flashing that bridges the gap between a VELUX roof window frame and slate roof tiles. It is essential for any installation of a VELUX MK08 window or Sun Tunnel system into a slate roof. Builders, roofers, and serious DIY installers carrying out new builds or refurbishment work will need this flashing to ensure a professional, weather-tight finish that does not compromise the appearance of a slate roof.

Compatibility and sizing

This flashing is specifically engineered for VELUX MK08 roof windows and VELUX Sun Tunnel systems only. The dimensions are 780 × 1400 mm, which corresponds to the MK08 window size. Do not use this flashing with other VELUX window sizes or non-VELUX systems. Check your roof window specification before ordering to confirm MK08 compatibility.

• Compatible with VELUX MK08 roof windows
• Compatible with VELUX Sun Tunnel systems
• Fixed dimensions: 780 × 1400 mm
• Not suitable for other window sizes or brands

Pre-installation checks and preparation

Before fitting, inspect your slate roof to ensure it is structurally sound and that the roof opening is correctly sized for the MK08 window and flashing. The recessed design requires careful alignment with existing slate courses to maintain a neat finish. Ensure you have the complete VELUX window installation kit and that all components are present. Check that the flashing is not damaged in transit, and verify that surrounding slate tiles are in good condition and properly secured.

• Confirm roof opening dimensions match MK08 specification
• Inspect slate roof structure for soundness and stability
• Check all components are present before starting work
• Ensure surrounding slate tiles are secure and undamaged
• Have the complete VELUX window installation instructions to hand

Installation and finish

The conservation-grade black finish is designed to blend with slate roof coverings whilst the recessed profile sits flush with the roof surface, creating a professional appearance. Installation must follow VELUX guidance to ensure the weather-tight seal is achieved. The flashing integrates with the window frame to direct water away from the building and maintain the integrity of the roof covering. This product is engineered for long-term performance in typical UK roof conditions, including exposure to wind, rain, and temperature variation.