Fixing and buying guide
VELUX Insulation Collar 134x98cm BDX UK04 2000
What this product is and who it is for
This insulation collar is a rafter-mounted thermal component used in loft insulation projects. It is designed for builders, roofers, and serious DIY installers working on timber frame construction. The collar fits standard UK rafter spacing and is commonly specified in new build and renovation work where thermal performance around roof timbers must be maintained during insulation installation.
- Professional builders and experienced DIY installers
- New build loft insulation projects
- Renovation and retrofit insulation work
- Projects requiring proper rafter detailing
Sizing and compatibility
This collar is sized to fit timber rafters with a width of 98cm and a length of 134cm. It is compatible with standard UK rafter spacing and timber frame construction methods. Before ordering, measure your rafter dimensions to confirm this size suits your installation. The BDX UK04 2000 grade material is engineered for the thermal and structural demands of loft insulation detailing.
- Rafter width: 98cm
- Rafter length: 134cm
- Compatible with standard UK timber frame construction
- Verify rafter dimensions before purchase
Pre-installation checks
Before fitting, inspect the collar for any damage and ensure your timber rafters are clean and free from debris. Check that rafter dimensions match the 98cm width and 134cm length specification. Ensure the installation area is properly prepared and that you have adequate access and working space around the rafters. The collar must be positioned securely to maintain thermal integrity throughout the insulation installation process.
- Inspect collar for damage on delivery
- Confirm rafter dimensions match product size
- Clean rafters and remove any debris
- Ensure adequate working space and access
- Plan collar positioning before installation
Material and thermal performance
The collar is manufactured from BDX UK04 2000 grade material, which delivers reliable thermal performance and durability in rafter detailing applications. This material grade is specified for its ability to maintain thermal integrity around roof timbers and withstand the demands of loft insulation installation in UK timber frame construction.
- BDX UK04 2000 grade material
- Engineered for thermal performance
- Durable in timber frame applications
- Maintains thermal integrity around rafters