How and where to use guide
VELUX Insulation Collar 114x118cm BDX SK06 2000
Suitable applications
This insulation collar is designed specifically for pitched roof installations where VELUX roof windows or Sun Tunnels are being fitted. It works as part of the complete flashing system to integrate the window or tunnel into the roof structure. The collar is suitable for both new build projects where roof windows are being installed during construction and refurbishment work where windows are being retrofitted into existing pitched roofs. It performs reliably in typical UK roof conditions and helps maintain integrated daylight and ventilation solutions across the property.
- VELUX roof window installations on pitched roofs
- VELUX Sun Tunnel installations on pitched roofs
- New build construction projects
- Refurbishment and retrofit projects
Installation and positioning
The collar must be installed around the roof window or Sun Tunnel opening before the roof covering is laid. Position the collar so that it sits flush against the roof structure, with the upper edge positioned to allow roof tiles or slates to overlap it properly. The 1140 x 1180mm dimensions are engineered to work with compatible VELUX systems, so ensure you have the correct model for your specific window or tunnel size. The aluminium and insulation composite construction allows it to be secured firmly to the roof structure whilst maintaining the thermal envelope of the building.
- Install before roof covering is laid
- Position collar flush against roof structure
- Ensure upper edge allows proper tile or slate overlap
- Verify compatibility with your specific VELUX window or Sun Tunnel model
- Secure firmly to maintain weather-tight seal
Weather-tightness and maintenance
The primary function of this insulation collar is to create a weather-tight seal that prevents water ingress around the roof window or Sun Tunnel opening. Once installed correctly, the collar requires minimal maintenance. Periodically check that roof tiles or slates remain properly seated over the collar edges and that no debris has accumulated around the flashing. In areas with heavy rainfall or exposure, inspect the collar annually to ensure the seal remains intact. The aluminium component resists corrosion in UK weather conditions, but ensure guttering and downpipes direct water away from the collar area to maintain optimal performance.
- Check tile or slate seating over collar edges regularly
- Clear debris from around the flashing
- Inspect annually in exposed locations
- Ensure guttering directs water away from collar
- Do not attempt to force or bend the collar during installation
Limitations and on-site tips
This collar is engineered specifically for VELUX roof windows and Sun Tunnels and must not be used with other manufacturers' products. The 1140 x 1180mm dimensions are fixed, so verify compatibility before ordering. The collar supports the thermal and weather performance of the installation but is one component of a complete system; ensure all other flashing elements and seals are installed according to VELUX specifications. On site, protect the collar from damage during roof works and avoid walking on it. Store in dry conditions before installation to prevent moisture absorption into the insulation composite.
- Compatible with VELUX systems only
- Verify model compatibility before installation
- Part of a complete flashing system—follow all VELUX specifications
- Protect from damage during roof works
- Store dry before installation