Fixing and buying guide

Who this product is for

This collar is for builders, roofers, and serious DIY installers fitting VELUX roof windows or Sun Tunnel systems. It is suitable for new build installations and refurbishment work on pitched roofs where a professional, weather-tight finish is required.

Compatibility and sizing

The BDX SK06 2000 collar is engineered specifically for compatible VELUX roof window and Sun Tunnel systems. The dimensions of 1140 x 1180mm are fixed for this product code. Before ordering, confirm that your VELUX window or Sun Tunnel model is compatible with the SK06 size and BDX collar type. Check your VELUX documentation or contact the supplier if you are unsure of the correct collar size for your installation.

• Product code: BDX SK06 2000
• Dimensions: 1140 x 1180mm
• Material: Aluminium and insulation composite
• Application: Pitched roof windows and Sun Tunnels only

What is included and pre-installation checks

This product is the insulation collar and flashing unit. Before installation, verify that your roof opening matches the collar dimensions and that the VELUX window or Sun Tunnel frame is compatible with the BDX SK06 type. Inspect the collar for any damage in transit. Ensure your roof structure is sound and ready to receive the installation, and that you have appropriate access and safety equipment for working at height on a pitched roof.

• Check compatibility with your VELUX window or Sun Tunnel model
• Verify roof opening dimensions match 1140 x 1180mm
• Inspect collar for transit damage before fitting
• Ensure roof structure is sound and safe for installation

Installation and performance

The collar creates a weather-tight seal between the VELUX window or Sun Tunnel frame and the roof surface, preventing water ingress and maintaining thermal performance. It is designed to perform reliably in UK roof conditions and should be installed according to VELUX fitting instructions. The aluminium and composite construction ensures durability and a professional finish. Proper installation is essential to achieve the weather-tight performance and long-term reliability this product is engineered to deliver.

• Creates weather-tight seal around window or Sun Tunnel frame
• Maintains thermal and weather performance
• Engineered for UK roof conditions
• Follow VELUX installation instructions for best results