How and where to use guide
VELUX Insulation Collar 66x118cm BDX FK06 2000
Installation and compatibility
This insulation collar is engineered specifically for VELUX FK06 roof windows and compatible VELUX systems. Before ordering, confirm your roof window model matches FK06 specification. The collar dimensions of 660 × 1180 mm are designed to fit the standard opening size for this window type. Installation should form part of the complete VELUX flashing system to ensure weather-tight performance. Always follow VELUX installation instructions provided with your specific roof window, as the collar must be positioned correctly between the window frame and roof structure to function effectively.
- Confirm your VELUX roof window is FK06 compatible before installation
- Use as part of the complete VELUX flashing and installation system
- Position the collar to bridge the frame-to-roof gap fully
- Follow VELUX guidance for your specific roof pitch and construction type
Weather protection and thermal performance
The insulation collar provides dual functionality: it creates a weather-tight seal to prevent water penetration around the window opening, and it offers thermal insulation to reduce heat loss at this critical junction. In UK roof conditions, this helps maintain building energy efficiency and prevents condensation issues that can arise from poor sealing. The collar contributes to the overall performance of your daylight and ventilation solution by ensuring the window system operates without air leakage or water ingress compromising its function.
- Prevents water ingress around the window opening in heavy rain
- Reduces thermal bridging and heat loss at the roof-window junction
- Helps prevent condensation and moisture-related problems
- Maintains the integrity of your integrated daylight and ventilation system
Application in new build and refurbishment
This collar is suitable for both new build and refurbishment projects. In new build work, install the collar as part of the initial roof window fitting, ensuring it is properly bedded and sealed before roof covering is applied. In refurbishment projects, the collar can be fitted when replacing or upgrading existing VELUX FK06 windows. The engineered design ensures reliable performance whether your roof is newly constructed or an existing structure, provided the roof opening dimensions match the FK06 specification.
- New build: fit during initial roof window installation before roof covering
- Refurbishment: use when replacing or upgrading existing FK06 windows
- Ensure roof opening dimensions match FK06 specification
- Check roof pitch compatibility with your VELUX system documentation
Maintenance and on-site handling
Inspect the collar during and after installation to confirm it sits flush and level, with no gaps or misalignment that could compromise the weather seal. Once installed and the roof covering is complete, the collar requires no routine maintenance as it is an integral part of the sealed system. On site, handle the collar carefully to avoid damage or deformation before installation, and store it in dry conditions. If you notice any water staining or condensation around the window frame after installation, this may indicate the collar has not sealed correctly and should be inspected.
- Inspect for proper seating and alignment before roof covering is applied
- Store in dry conditions prior to installation
- Handle carefully to avoid dents or deformation
- Monitor for water staining or condensation issues after installation, which may indicate sealing problems