How and where to use guide
VELUX Insulation Collar 134x98cm BDX UK04 2000
Typical applications
This insulation collar is used in loft insulation projects where timber frame rafters need thermal protection and detailing. It is commonly installed in new build properties and renovation schemes to create a secure thermal envelope around roof timbers. The collar works with standard UK rafter spacing and construction methods, making it compatible with most domestic and light commercial timber frame roof structures.
- New build loft insulation installation
- Renovation and upgrade projects requiring rafter detailing
- Thermal barrier creation around timber roof structures
- Projects using standard UK rafter spacing
Installation and positioning
The collar should be positioned around the timber rafter during loft insulation work to ensure a secure fit and maintain thermal integrity. The 98cm width is designed to accommodate standard rafter dimensions. Ensure the collar is properly seated around the rafter before installing bulk insulation materials. The 134cm length provides adequate coverage for typical rafter detailing requirements. Position the collar to create a continuous thermal barrier and prevent thermal bridging at the rafter junction.
- Fit collar around timber rafter before installing bulk insulation
- Ensure secure seating to maintain thermal performance
- Use the full 134cm length for complete rafter coverage
- Check alignment with existing rafter spacing before installation
Performance and limitations
The BDX UK04 2000 grade material delivers reliable thermal performance suitable for UK loft insulation standards. This collar is designed specifically for timber frame rafter applications and should not be used in other structural contexts. Performance depends on correct installation and secure fitting around the rafter. The collar works as part of a complete insulation system and should be used alongside appropriate bulk insulation materials and vapour control measures.
- Thermal performance depends on secure installation around rafters
- Designed for timber frame construction only
- Must be used as part of a complete insulation system
- Requires compatible bulk insulation materials for full system performance
On-site handling and storage
Store the insulation collar in dry conditions before installation to maintain material integrity. Handle carefully to avoid damage to the BDX UK04 2000 grade material, which could compromise thermal performance. Keep the product protected from moisture and weather exposure until it is fitted around the rafter. Inspect the collar before installation to ensure no damage has occurred during transport or storage.
- Store in dry conditions away from moisture
- Protect from weather exposure before installation
- Inspect for damage before fitting around rafter
- Handle carefully to preserve material integrity