How and where to use guide
VELUX Insulation Collar 78x118cm BDX MK06 2000
Typical applications and where to install
This insulation collar is designed specifically for loft spaces and attic areas where MK06 VELUX roof windows are fitted into standard timber roof structures. It is suitable for use with FSC-certified timber and above, making it appropriate for most residential loft conversions and attic insulation projects. The collar should be installed around the perimeter of the 78×118cm roof opening before or during your loft insulation installation. Common applications include new loft conversions, attic refurbishment projects, and upgrading existing roof window installations to improve thermal performance.
- Loft conversions with MK06 roof windows
- Attic insulation projects requiring thermal sealing
- Retrofit insulation upgrades around existing windows
- New build properties with standard timber roof structures
Installation and positioning
The insulation collar must be positioned around the window opening before laying your loft insulation material. Ensure the collar sits flush against the roof structure and window frame, creating a continuous seal. The collar should be installed in accordance with VELUX manufacturer guidance to guarantee optimal thermal and structural performance. Position it so that your insulation material will compress gently against it, creating an airtight barrier without forcing or distorting the collar. Check that the collar is level and properly seated on all sides before proceeding with insulation installation.
- Install collar around the window opening perimeter before laying insulation
- Ensure flush contact with both roof structure and window frame
- Follow VELUX manufacturer installation instructions precisely
- Verify level positioning on all sides before insulation application
- Allow insulation to compress gently against the collar for an airtight seal
Thermal performance and building regulations
This insulation collar plays a critical role in meeting current building regulations for thermal efficiency in loft spaces. By minimising heat loss and air infiltration at the window perimeter, it helps achieve the continuous thermal envelope required by Building Regulations. The collar prevents cold bridging around the window frame, which would otherwise create condensation risk and reduce the overall U-value performance of your insulation installation. Proper installation of this collar is essential for demonstrating compliance with energy efficiency standards in loft conversions and attic projects.
- Prevents cold bridging at window perimeter
- Reduces heat loss and air infiltration
- Supports continuous thermal envelope requirements
- Helps achieve Building Regulations compliance for loft spaces
- Minimises condensation risk around window frame
Maintenance and on-site tips
Once installed and covered by insulation, the collar requires no ongoing maintenance. However, during installation, protect it from damage by handling carefully and avoiding compression or distortion before the insulation is in place. Ensure the collar remains clean and free from debris before covering with insulation material. If you are working in damp conditions, allow any moisture on the collar to dry before proceeding. The collar is designed to remain in place permanently as part of your thermal envelope, so correct initial installation is essential. Do not attempt to remove or reposition the collar once insulation has been laid.
- Handle carefully during installation to avoid damage or distortion
- Keep clean and free from debris before covering with insulation
- Allow to dry if exposed to moisture during installation
- Do not remove or reposition once insulation is in place
- No maintenance required once installation is complete