How and where to use guide
VELUX Insulation Collar 55x78cm BDX CK02 2000
Suitable applications and compatibility
This insulation collar is engineered specifically for VELUX roof window and Sun Tunnel systems. Before ordering, verify that your VELUX unit is compatible with the BDX CK02 2000 model and that the 550 x 780mm dimensions match your installation requirements. The collar is suitable for use in typical UK roof conditions on both new build projects and refurbishment work where existing roof structures are being upgraded with new daylight or ventilation solutions.
- Check VELUX product documentation to confirm compatibility with your specific window or Sun Tunnel model
- Verify roof pitch and construction type are suitable for VELUX installation
- Confirm dimensions match your opening size before purchase
Installation and positioning
The insulation collar must be installed as part of the complete VELUX flashing system to ensure a weather-tight finish. Position the collar around the window frame opening before securing the main flashing components. The collar sits between the roof structure and the window frame, creating a thermal and moisture barrier. Follow VELUX installation guidance carefully, as improper positioning will compromise weather protection and may lead to condensation or water ingress around the frame.
- Install the collar before fitting the main roof flashing components
- Ensure the collar sits flush against the roof structure with no gaps
- Use appropriate fixings as specified in VELUX installation instructions
- Seal all joints and edges with suitable roof sealant to maintain weather-tightness
Weather protection and durability
This collar is engineered to support a weather-tight roof finish and contribute to the professional appearance of your installation. It helps prevent water penetration at the critical junction between the roof and window frame, protecting both the window mechanism and the building fabric beneath. The collar is designed for long-term durability in UK roof conditions, but its effectiveness depends on correct installation and regular inspection.
- Inspect the collar and surrounding flashing annually for signs of damage or deterioration
- Clear any debris or moss from around the collar to prevent water pooling
- Check sealant condition and reapply if cracking or shrinkage is visible
- Do not attempt to repair the collar itself; replace if damaged
On-site handling and storage
Store the collar in dry conditions before installation to prevent moisture absorption or damage. Handle carefully to avoid denting or bending the flashing, as this may prevent proper seating against the roof structure. Keep the product protected from weather and site debris until you are ready to install it as part of your VELUX system.
- Store flat and dry in a secure location on site
- Do not expose to prolonged sunlight or extreme temperatures before installation
- Inspect for damage upon delivery and before fitting