FAKRO XDP Under Felt Collar

The FAKRO XDP Under Felt Collar is designed to improve insulation and airtightness around roof window installations by creating a secure connection between the window frame and the roof structure. Installed externally beneath the roofing underlay, this insulation collar helps eliminate gaps around the window, reducing thermal bridging and supporting improved energy efficiency throughout the roof space.

The XDP collar fills the space between the roof window and surrounding roof construction, making insulation quicker, cleaner and more effective during installation. It is manufactured from specially impregnated sheep wool, a natural and environmentally friendly insulation material that is odour-free, gentle on the skin and non-irritating to the eyes. This flexible material can be easily cut and shaped on site, allowing it to fit snugly around the window frame and adapt to different roof structures without difficulty.

By improving insulation continuity around the window, the XDP under felt collar helps minimise heat loss and supports a more stable internal temperature. It also allows moisture vapour to escape safely, reducing the risk of condensation forming within the roof structure. This makes it an excellent choice for energy-efficient roof window installations where long-term performance and sustainability are important.

Features & Benefits:

• Designed to insulate the space between the roof window and roof structure
  
• Reduces thermal bridging to help minimise heat loss
  
• Improves airtightness around roof window installations
  
• Made from natural impregnated sheep wool insulation
  
• Environmentally friendly material that is odour free and skin safe
  
• Flexible and easy to cut for a precise on site fit
  
• Supports improved energy efficiency and indoor comfort