How and where to use guide
VELUX Insulation Collar 114x118cm BDX SK06 2011
Typical applications and installation
This insulation collar is used during roof window installation in new-build or renovation projects where timber rafters form the roof structure. It is positioned around the window opening before the window frame is fitted, creating a thermal break between the frame and the surrounding timber. The collar accommodates insulation materials such as mineral wool or rigid foam board, which are packed into the space between the window frame and rafter. It is essential to verify that your roof window length does not exceed 1m, as this is the maximum specification for this collar size.
- Install during initial roof window fitting, before final frame sealing
- Position collar around the window opening in the rafter space
- Pack approved insulation materials into the collar cavity
- Ensure window length does not exceed 1m
- Verify compatibility with VELUX SK06 2011 system before purchase
Material properties and durability
The collar is manufactured from fibre-reinforced plastic with a baked enamel coating, providing durability and weather resistance in the roof void environment. The baked enamel finish protects against moisture and condensation exposure within the rafter cavity. The fibre-reinforced construction ensures the collar maintains its shape and structural integrity when supporting insulation materials and resisting compression from roof loads.
- Fibre-reinforced plastic resists warping and deformation
- Baked enamel coating provides moisture and condensation protection
- Durable finish suitable for long-term roof void exposure
- No maintenance required once installed
Limitations and site considerations
This collar is designed exclusively for timber-framed roof structures and timber rafter applications. It is not suitable for metal rafter systems or non-timber roof constructions. The 114 x 118cm dimensions and 1m maximum window length specification must be strictly observed; oversized windows will not achieve a secure fit. Always verify your specific roof window model and dimensions against the VELUX SK06 2011 compatibility before ordering. Installation should be carried out in accordance with VELUX system requirements and building regulations for your region.
- Timber-framed structures only; not suitable for metal rafters
- Maximum window length 1m; verify your window size before installation
- Dimensions 114 x 118cm; confirm fit against your roof opening
- Follow VELUX system installation guidance and local building regulations
- Do not attempt to modify or cut the collar to fit non-standard openings