How and where to use guide
VELUX Insulation Collar 134x140cm BDX UK08 2011
Typical applications and where to use
This insulation collar is primarily used in roof and wall applications where VELUX windows or roof lights are being installed. It sits around the perimeter of the opening to bridge the gap between the window frame and the surrounding timber structure. Common applications include pitched roof installations, flat roof conversions, and wall-mounted glazing in both new build and renovation projects. The collar is particularly valuable in thermally demanding applications where minimising heat loss around the window opening is essential for building regulation compliance and energy efficiency.
- Roof light and window installations in pitched and flat roofs
- Wall-mounted VELUX applications in external walls
- New build and retrofit projects requiring thermal bridging prevention
- Installations in timber-framed structures with F16, F24, or F32 grades
Installation and usage steps
Begin by confirming your timber grade matches F16, F24, or F32 and that the 134 x 140cm dimensions align with your opening. Position the collar around the window frame opening before installing the VELUX insulation boards. The collar should sit flush against the timber structure to ensure a snug fit and optimal thermal performance. Secure the collar using suitable fixings appropriate to your timber grade and structural requirements. Once fixed, install the VELUX insulation boards in conjunction with the collar to complete the thermal envelope. Ensure all edges are properly sealed to prevent moisture penetration.
- Verify timber grade and opening dimensions before installation
- Position collar around frame perimeter for snug fit
- Use appropriate fixings for your timber grade
- Install VELUX insulation boards in conjunction with collar
- Seal all edges to prevent moisture ingress
Limitations and maintenance
This collar is designed specifically for use with timber grades F16, F24, and F32; do not use with other timber grades or materials without confirming compatibility. The fiberglass material with baked enamel coating is durable but should be inspected periodically for any damage to the coating, particularly in exposed roof applications. Avoid impact damage during handling and installation. The collar is not a standalone insulation solution and must be used with VELUX insulation boards to achieve the intended thermal and moisture protection. Regular inspection of the seal around the collar helps maintain long-term performance and prevents moisture-related issues.
- Only suitable for timber grades F16, F24, F32
- Must be used with VELUX insulation boards
- Inspect baked enamel coating regularly for damage
- Ensure all seals remain intact to prevent moisture ingress
- Handle carefully to avoid impact damage during installation
On-site tips and best practice
Measure your opening carefully before ordering to confirm the 134 x 140cm size is appropriate for your application. On site, protect the collar from damage during storage and handling. Install the collar as part of a complete system with VELUX insulation boards rather than as an isolated component. Ensure the timber structure is sound and dry before installation. If working in damp conditions, allow the timber to acclimatise and dry fully before fitting. Use fixings that are appropriate for your specific timber grade to ensure secure installation. After installation, check that the collar sits evenly and that no gaps remain between the collar and the timber frame.
- Measure opening dimensions accurately before ordering
- Protect collar from damage during storage and transport
- Install as part of complete VELUX insulation system
- Ensure timber is dry and sound before installation
- Use fixings rated for your timber grade
- Check for even fit and no gaps after installation