Fixing and buying guide

What this product is and who needs it

Recessed flashings are the weatherproofing interface between your VELUX roof window and the slate roof tiles. They prevent water ingress around the window perimeter by creating a sealed transition. This product is essential for any builder, surveyor, or serious DIY installer fitting VELUX roof windows to slate roofs. Whether you are working on a new build or refurbishing an existing property, these flashings ensure a professional, weather-tight installation that looks integrated with your roofline.

Compatibility and sizing

These flashings are sized at 940×1600mm and are specifically designed for VELUX roof window systems. Before ordering, confirm that your roof window dimensions match this specification. The recessed design is engineered for slate roof finishes, so verify your roof covering type. Each pack contains 10 units, which is suitable for multiple window installations or stock for larger projects.

• Dimensions: 940×1600mm — check your VELUX window size matches
• Designed for slate roof finishes only
• Pack of 10 units per order
• Part of the complete VELUX roof window system

Pre-installation checks

Before fixing, inspect the flashing for any damage during transit and ensure your roof structure is sound and ready to receive the window. Check that the roof opening is correctly sized and that surrounding slate tiles are in good condition. Ensure you have all other components of the VELUX roof window system to hand, including the window frame itself and any additional sealing materials specified by VELUX. Verify weather conditions are suitable for installation — avoid wet or windy weather that could compromise the seal.

• Inspect flashing for transport damage
• Confirm roof opening dimensions match the 940×1600mm flashing size
• Check slate roof condition around the installation area
• Gather all VELUX system components before starting work
• Plan installation during dry weather conditions

Installation overview

The recessed flashing is positioned to sit flush with the slate roof surface, creating a neat, integrated finish. The flashing creates the weather-tight seal around the window perimeter as part of the complete VELUX installation process. Follow VELUX's detailed installation instructions carefully to ensure proper seating and sealing. The recessed design means the flashing must be correctly aligned with both the roof tiles and the window frame to function effectively. Professional installation is recommended for best results, particularly on complex roof geometries or refurbishment projects where roof condition may vary.