Fixing and buying guide

What this product is and who needs it

A recessed tile flashing is a metal or composite component that sits between your roof tiles and a roof window frame. It channels rainwater safely away whilst creating a weatherproof seal. You need this flashing if you are installing a VELUX UK04 roof window into a pitched tiled roof, whether in new build or refurbishment work. Professional installers and experienced DIY customers fitting roof windows will require this component.

Sizing and compatibility

This flashing is sized at 1340×980mm with a 90mm recessed depth. These dimensions are engineered to suit standard UK roof tile profiles and are compatible exclusively with VELUX UK04 roof windows. Before ordering, confirm your window model is UK04 and measure your roof pitch and tile profile to ensure the 90mm recess depth accommodates your specific tiles. Incompatible window sizes or tile profiles will compromise the weather seal.

• Flashing dimensions: 1340×980mm
• Recess depth: 90mm
• Compatible with: VELUX UK04 roof windows only
• Suitable for: Pitched tiled roofs

Pre-installation checks

Before fitting, verify that your roof opening is correctly sized for UK04 windows and that your tile profile matches the 90mm recess specification. Check that the roof structure is sound, level, and free from rot or damage. Ensure you have the VELUX window frame ready and that all installation guidance documentation is to hand. Poor roof preparation or incorrect opening dimensions will result in water ingress and installation failure.

• Confirm VELUX UK04 window compatibility
• Measure roof opening and tile profile depth
• Inspect roof structure for soundness and level
• Review installation guidance before starting work

Installation support and next steps

Installation guidance documentation is included with this flashing to support proper fitting. The flashing must be positioned beneath the roof tiles with the recess accommodating your tile profile, and sealed to the window frame to create a weather-tight junction. If you are unfamiliar with roof window installation, consider engaging a qualified roofer or VELUX-approved installer to ensure the work meets building regulations and guarantees long-term performance. Improper installation will void warranties and create water ingress risks.