Fixing and buying guide

What this product is and who it is for

This is a purpose-made flashing system for VELUX roof windows. It is intended for builders, roofers, and experienced DIY installers undertaking new build or refurbishment work where a VELUX roof window of size CK04 2000 (55×98cm) is being fitted into a tiled roof. The flashing creates the critical weather-tight interface between the window frame and roof tiles, preventing water ingress and ensuring a neat, professional finish.

Compatibility and sizing

This flashing kit is specifically designed for VELUX roof windows of size CK04 2000, which measures 55×98cm. The 120mm tile flashing with integrated BDX 2000 component is engineered to work with standard tile roof coverings. Before purchasing, confirm that your VELUX window is the correct size designation and that your roof is covered with compatible tile materials. This kit is not suitable for other window sizes or non-tile roof coverings such as slate or metal.

• Window size: 55×98cm (CK04 2000) only
• Roof type: Tile compatible
• Flashing depth: 120mm tile flashing

What is included and pre-installation checks

The kit contains all necessary installation products required for a complete, professional installation. Before opening and fitting, verify that the VELUX window frame is the correct size and that you have the matching flashing kit. Inspect the flashing components for any damage in transit. Check that your roof opening is properly prepared and that surrounding tiles are in good condition. Ensure you have appropriate access equipment and that weather conditions are suitable for roof work—dry conditions are essential for proper sealing.

• Complete kit with all installation products included
• Verify window size matches CK04 2000 designation
• Inspect flashing for transit damage
• Confirm roof opening is properly prepared

Installation and performance

Installation should be carried out by a competent roofer or experienced builder familiar with roof window fitting. The flashing system is engineered to provide a weather-tight seal and visually consistent roof finish when installed correctly. The kit supports neat, professional installation that integrates seamlessly with standard tile roof coverings. Follow VELUX installation instructions carefully, ensuring all components of the BDX 2000 system are properly secured and sealed. Proper installation is essential for long-term weather performance in UK roof conditions.