Fixing and buying guide

What this product is and who needs it

This is a coupled recessed tile flashing for VELUX roof windows and Sun Tunnel systems. It is designed for builders, roofers, and serious DIY installers who are fitting or replacing VELUX roof windows on pitched tile roofs. The flashing creates the critical weather-tight seal between the roof window frame and the surrounding roof tiles, preventing water penetration and condensation issues. Both new build projects and refurbishment work require this component as part of a complete daylight and ventilation solution.

Compatibility and sizing

This flashing is specifically designed for VELUX CK06 roof windows, which measure 550 by 1180mm. The EKJ CK06 S0021E is a twin and combination flashing, meaning it is suitable for coupled or combination installations with compatible VELUX roof window and Sun Tunnel ranges. Before purchasing, confirm that your roof window model is CK06 and check with VELUX documentation or your supplier that this flashing matches your specific installation configuration.

• Roof window size: CK06 (550×1180mm)
• Flashing type: Twin and combination (coupled recessed)
• Recess depth: 90mm to suit standard roof tile thicknesses
• Application: Pitched tile roofs only

Pre-installation checks

Before fixing, inspect the roof structure and tiles to ensure they are in sound condition and that the opening is correctly sized and squared. Verify that the roof pitch and tile profile are suitable for a 90mm recessed flashing. Check that all components of your VELUX roof window system are present and undamaged. Ensure you have the correct flashing orientation and that you understand the coupling arrangement if installing multiple windows. Have all necessary fixings, sealants, and underlayment materials to hand before starting work.

• Confirm roof window opening is correctly sized and squared
• Check roof tiles and structure are sound and level
• Verify roof pitch is suitable for recessed tile flashing installation
• Inspect flashing for damage and confirm correct product code EKJCK06S0021E
• Gather all fixings, sealants, and underlayment before installation begins

Installation overview

This coupled recessed flashing is installed as part of the VELUX roof window assembly process. The 90mm recessed profile sits flush with the roof plane, creating a neat finish that integrates with standard roof tiles. The flashing must be secured and sealed according to VELUX installation instructions to ensure a weather-tight seal and prevent water ingress and condensation. Professional installation is recommended for most projects; refer to the detailed VELUX installation guide supplied with your roof window system for step-by-step procedures, fixing methods, and sealant specifications.