How and where to use guide
VELUX Vapour Barrier 78x118cm BBX MK06 0000
Where to use this product
Install this vapour barrier collar on any roof penetration using a VELUX MK06 roof window or Sun Tunnel system. It is designed for pitched roof applications in residential properties and works in typical UK roof conditions. The collar is compatible only with VELUX MK06 systems, so verify your window model before purchase. Use in both new build installations and refurbishment projects where existing roof structures are being upgraded or modified.
- Pitched roof installations with VELUX MK06 windows or Sun Tunnels
- New build residential construction
- Refurbishment and retrofit projects
- Any roof penetration requiring weather-tight vapour control
Installation and application
Position the vapour barrier collar around the roof window opening before fitting the window frame itself. The collar should sit flush against the roof structure and be secured according to VELUX installation instructions for your specific window model. Ensure the collar is properly seated to create a continuous vapour barrier that prevents warm, moist air from the interior reaching the cold roof void. The collar works in conjunction with other VELUX flashing and installation components to achieve a complete weather-tight seal.
- Install before the roof window frame is positioned
- Ensure full contact with roof structure around entire opening
- Secure according to VELUX MK06 installation guidance
- Check for gaps or creases that could compromise the vapour seal
- Work with compatible VELUX flashing and collar systems
Performance and maintenance
This collar is engineered to provide long-term durability in UK roof conditions and maintains its weather-resistant properties throughout the life of the installation. Once installed correctly, the vapour barrier requires no ongoing maintenance. However, ensure that the roof covering and flashing around the window are kept clear of debris and that guttering remains unobstructed, as these factors affect overall roof performance. Inspect the external seal periodically, particularly after severe weather, to confirm that flashing remains secure and undamaged.
- No routine maintenance required once installed
- Keep roof covering and flashing clear of moss, leaves and debris
- Check external seals and flashing after high winds or heavy rain
- Ensure guttering and drainage around the window remain clear
- Contact VELUX if you notice any signs of water ingress or condensation
Important limitations and compatibility
This vapour barrier collar is designed exclusively for VELUX MK06 roof windows and Sun Tunnel systems. It will not fit other VELUX window sizes or non-VELUX roof penetration systems. Always verify your window model code before ordering. The collar is a component part of a complete installation system; it must be used with appropriate VELUX flashing, installation collars and roof covering materials to achieve a weather-tight finish. Do not attempt to adapt or modify the collar for use with incompatible systems.
- Compatible only with VELUX MK06 systems
- Not suitable for other window sizes or manufacturers
- Must be used as part of complete VELUX installation system
- Requires compatible flashing and installation components
- Do not modify or adapt for non-standard applications