Fixing and buying guide

What this product is and who it is for

This is a slate roof flashing system for VELUX roof windows and Sun Tunnel systems sized 55×78cm (CK02 2000). It is designed for builders, roofers, and serious DIY customers installing or replacing roof windows in slate-covered roofs. The kit suits both new build installations and refurbishment work where you need a weather-tight seal that matches the appearance of existing slate roof coverings.

Compatibility and sizing

This flashing kit is engineered specifically for VELUX roof windows and Sun Tunnel systems with a window opening of 55×78cm (CK02 2000 size). The Pro+ Standard specification is designed for slate roof applications. Before ordering, confirm your roof window model and opening dimensions match this specification, and verify that your roof covering is slate rather than tiles, felt, or other materials.

• Window size: 55×78cm (CK02 2000)
• Roof type: Slate only
• Compatible with VELUX roof windows and Sun Tunnel systems
• Suitable for new build and refurbishment projects

What is included and pre-installation checks

The kit is supplied as a complete flashing system with all necessary installation products included for straightforward fitting. This means you should have everything required for a professional installation without needing to source additional components separately. Before installation, check that your roof structure is sound, the opening dimensions are correct, and the slate roof is in good condition around the installation area. Ensure you have adequate access and working space on the roof.

• Complete kit with all installation products included
• No additional flashing components required
• Verify roof window opening is 55×78cm
• Check roof structure and slate condition before fitting
• Ensure safe access to roof installation area

Installation and performance

The flashing system is engineered to provide a weather-tight seal around your roof window opening whilst maintaining the visual appearance of your slate roof. The Pro+ Standard specification is designed for reliable performance in typical UK roof conditions. Installation should be carried out by experienced roofers or competent DIY installers familiar with roof work and flashing systems. The integrated design ensures the flashing sits neatly with slate coverings for a professional finish that protects against water ingress.