How and where to use guide
VELUX Insulation Collar 134x140cm BDX UK08 2000
Where to use this product
Install the VELUX Insulation Collar in timber-framed buildings wherever wooden beams pass through the building envelope. It is specifically designed for roof trusses, wall construction, and general timber framing applications. The collar creates a seal around structural timber elements to prevent cold air bypass and water penetration at these critical junctions. Use it in new construction or retrofit projects where timber members require protection from air leakage and moisture ingress.
- Roof trusses and rafter connections
- Timber-framed wall construction
- Structural beam penetrations through the building envelope
- Applications with timber lengths up to 4m
Installation and application
Position the collar around the timber element before or during framing installation. The 134×140cm dimensions accommodate standard timber cross-sections. Ensure the collar sits flush against the timber and any adjacent building materials such as insulation batts or rigid boards. The collar should be secured firmly to prevent movement during construction and subsequent settling. Install it as part of your air-tightness strategy, working in conjunction with other sealing measures such as membranes and sealants at joints.
- Measure and position the collar around the timber element
- Ensure full contact with the timber surface
- Secure the collar to prevent displacement during construction
- Integrate with surrounding insulation and air-barrier materials
- Check alignment before fixing adjacent materials
Performance and maintenance
The VELUX Insulation Collar is manufactured with a durable, wear-resistant finish engineered to maintain performance throughout the building's life. Once installed and covered by surrounding construction materials, the collar requires no ongoing maintenance. The durable coating resists degradation from handling during installation and from exposure to typical building site conditions. Inspect the collar during installation to ensure it has not been damaged in transit or on site, and confirm it remains in place once the building envelope is closed.
- Durable finish resists wear during installation and use
- No routine maintenance required once installed
- Inspect for damage before and after installation
- Verify secure positioning before covering with adjacent materials
Limitations and on-site tips
This collar is designed for timber lengths up to 4m; do not use with longer structural members as the seal may be compromised. The 134×140cm size is specified for standard timber framing applications; confirm your timber dimensions match this specification before ordering. Install the collar in dry conditions where possible to ensure proper seating and adhesion. Protect the collar from damage during construction by avoiding sharp impacts and ensuring it is not crushed by heavy materials or equipment. Store on site in a dry location until installation.
- Maximum timber length 4m; not suitable for longer members
- Verify timber dimensions match 134×140cm collar size
- Install in dry conditions for optimal performance
- Protect from physical damage during construction
- Store in dry conditions before installation