Fixing and buying guide
VELUX Insulation Collar 55x78cm BDX CK02 2011
What this product is and who needs it
This insulation collar is an essential component for anyone installing a VELUX CK02 2011 roof window into a timber-framed roof. It sits between the window collar and the roof structure, providing thermal insulation and air-sealing. The fiberglass construction is durable and suitable for long-term use in both residential lofts and commercial roof spaces. If you are fitting a VELUX roof window and want to minimise heat loss and draughts around the installation, this collar is a necessary purchase.
- Designed specifically for VELUX CK02 2011 collar compatibility
- Reduces thermal bridging and air leakage at roof penetrations
- Suitable for domestic and commercial applications
- Durable fiberglass construction
Compatibility and sizing
This collar measures 55 x 78cm and is designed to fit the VELUX CK02 2011 collar only. Before ordering, confirm that your roof window uses this specific collar type. The collar is suitable for use with timber grades FSC 32mm and above, which covers standard roof rafter and truss construction in most UK buildings. If your timber is thinner than 32mm or you are using a different VELUX collar model, this product will not be compatible.
- Fits VELUX CK02 2011 collar exclusively
- Requires timber grade FSC 32mm or thicker
- Dimensions: 55 x 78cm
- Check your existing collar reference before purchase
Installation and preparation
Installation is straightforward and should be carried out during the roof window fitting process. The collar wraps around the roof trusses and rafters, creating an insulated seal between the window frame and the roof structure. Ensure the timber is clean and dry before fitting, and that the collar sits evenly around all sides of the window opening. The fiberglass material is easy to handle and can be trimmed if necessary to fit your specific roof configuration. Installation should be completed before the roof is weatherproofed to ensure a proper seal.
- Install during roof window fitting, before weatherproofing
- Wrap collar evenly around roof trusses and rafters
- Ensure timber surface is clean and dry
- Fiberglass can be trimmed to suit your roof structure
Pre-installation checks
Before fitting, verify that you have the correct VELUX CK02 2011 collar and that your roof timber meets the FSC 32mm minimum grade requirement. Check that the roof opening dimensions match the 55 x 78cm collar size. Inspect the timber for rot, damage, or excessive moisture, as the collar will seal the area and any existing problems may worsen. Ensure you have adequate access and working space around the roof penetration point, as the collar must be fitted evenly and securely.
- Confirm VELUX CK02 2011 collar compatibility
- Verify timber grade is FSC 32mm or above
- Inspect timber for rot, damage, or moisture issues
- Check roof opening dimensions against 55 x 78cm collar size