Fixing and buying guide

What this product is and who needs it

This is a specialist flashing designed to weatherproof the junction between a VELUX roof window or Sun Tunnel and your roof tiles. It is for builders, roofers, and serious DIY installers carrying out roof window installation or replacement on pitched tile roofs. The coupled recessed design means it works as part of a matched system with your chosen VELUX window or tunnel unit, ensuring consistent performance and appearance across the roof.

Compatibility and sizing

This flashing is engineered for VELUX roof window and Sun Tunnel systems and is compatible with standard roof tile profiles. The 780 x 980mm dimensions and 90mm recess depth are fixed specifications, so you must confirm your roof window or tunnel unit matches this flashing size before purchase. Check your VELUX product documentation or contact the supplier to verify compatibility with your specific window model and tile type.

• Dimensions: 780 x 980mm
• Recess depth: 90mm
• Designed for standard roof tile profiles
• Coupled system – must match your VELUX window or Sun Tunnel unit

What is included and pre-installation checks

You are purchasing the flashing unit itself. Before installation, inspect the flashing for any damage in transit and confirm the dimensions and recess depth match your roof opening and window unit. Check that your roof structure can accommodate a 90mm recess and that your tiles are in good condition around the installation area. Ensure you have the correct VELUX window or Sun Tunnel unit to hand, as the flashing must be installed as part of the complete system for weather-tightness and proper function.

• Inspect flashing on delivery for transport damage
• Verify dimensions and recess depth suit your roof opening
• Confirm tile type and roof structure compatibility
• Have your VELUX window or Sun Tunnel unit ready before starting work

Installation and performance

This flashing is engineered for reliable performance in typical UK roof conditions and supports a professional, weather-tight installation when fitted correctly as part of the VELUX system. Installation should follow VELUX technical guidance and building regulations for your region. The coupled recessed design ensures a consistent roof finish and integrated daylight or ventilation solution. Professional installation is recommended to guarantee long-term weather protection and system integrity.