Fixing and buying guide

What this product is and who needs it

This insulation collar reduces unwanted draughts and heat loss around your roof window opening. It is designed for homeowners and builders undertaking loft conversions or new build projects where maintaining a thermal envelope around roof windows is important for energy performance and comfort. The collar sits between the roof structure and your VELUX window system to create a secure, insulated seal.

Sizing and compatibility

This collar measures 134x98cm and is sized for standard UK roof openings. It is compatible with VELUX roof window systems and should be used alongside VELUX roof tiles as part of the complete installation. Check your roof opening dimensions before ordering to ensure this size matches your requirements. The adjustable design allows for secure positioning around your loft area, accommodating minor variations in installation conditions.

• Dimensions: 134 x 98cm
• Material: Fiberglass with baked-on finish
• Compatible with VELUX roof window and tile systems
• Suitable for both new builds and loft conversion retrofits

Before you install

Ensure your roof opening is prepared and ready to receive the window system. The collar should be fitted as part of the complete VELUX installation sequence, typically before the roof tiles and window are positioned. Check that the opening dimensions match the 134x98cm collar size. Have your VELUX roof tiles and window components to hand, as the collar forms part of an integrated thermal system. If you are unfamiliar with roof window installation, consider engaging a qualified installer to ensure proper thermal performance and weatherproofing.

• Verify roof opening dimensions match 134x98cm
• Prepare the roof structure and opening before installation
• Have VELUX roof tiles and window system ready
• Follow VELUX installation guidance for correct sequencing

Performance and maintenance

The fiberglass construction with baked-on finish is designed to withstand loft environment conditions and maintain thermal performance over time. Once installed as part of your VELUX system, the collar requires no special maintenance. Its durable finish resists moisture and temperature fluctuations typical of UK loft spaces, supporting long-term energy efficiency in your home.