Fixing and buying guide

What this product is and who it is for

This is a standard slate flashing kit engineered specifically for installing VELUX roof windows and Sun Tunnel systems into slate-tiled roofs. It is intended for builders, roofers, and experienced DIY customers undertaking new roof window installations or replacing existing roof window flashings on slate roofs. The flashing creates a weather-tight seal between the roof window frame and the slate tiles, preventing water ingress and ensuring long-term durability.

Compatibility and sizing

This flashing is sized at 78×140cm (780×1400mm) and is compatible with standard VELUX roof window ranges and VELUX Sun Tunnel systems. Before ordering, confirm that your roof window model is compatible with the MK08 flashing size. Slate roofs are the only suitable application for this product; it is not designed for use with other roof coverings such as tiles, felt, or metal roofing.

• Flashing size: 78×140cm
• Roof type: Slate only
• Compatible with VELUX roof windows and Sun Tunnel systems
• Check your window model against VELUX compatibility charts before purchase

What is included

The Pro+ specification includes the standard slate flashing unit plus all installation products needed to complete the roof window installation. This means you receive the flashing itself and the supporting fixings and sealing materials in one pack, reducing the need to source components separately.

• Standard slate flashing (78×140cm)
• Installation products included in the pack
• Complete system for weather-tight installation

Pre-installation checks and preparation

Before installation, inspect the slate roof condition and ensure the roof opening dimensions match the flashing size. Confirm that the VELUX roof window frame is compatible with this MK08 flashing. Check that all installation products are present in the pack. Ensure you have appropriate access equipment and that weather conditions are suitable for roof work. Review VELUX installation instructions carefully, as proper flashing installation is critical to long-term weather performance.