The FAKRO XDK Insulating Set is an all-in-one solution designed to provide fast, effective, and airtight thermal insulation around your roof window. Suitable for all window sizes and roof openings, this kit ensures maximum energy efficiency and moisture protection – enhancing the performance and comfort of your space.

The XDK set includes three specialist components: an air-permeable collar, thermo-insulating material, and an air-tight flashing – all working together to prevent thermal bridging, reduce heat loss, and maintain airtightness around the window installation.

What's Included:

• Air-Permeable Collar (XDP) – Allows easy connection to roof membranes without cutting battens; protects insulation from external moisture and ensures a snug fit between the window and sheeting.
• Thermo-Insulating Material – Made from specially impregnated natural sheep wool, this eco-friendly material is flexible, easy to cut, and adjusts perfectly to the insulation space, helping maintain thermal performance.
• Air-Tight Collar (XDS) – Provides a secure internal barrier against warm and humid air, protecting the insulation from internal moisture and ensuring long-term effectiveness.

Key Benefits:

• Universal fit for all Fakro roof windows and roof opening sizes.
• Prevents thermal bridging and improves energy efficiency.
• Easy installation – no cutting of battens or complex prep required.
• Eco-friendly, smell-free and irritation-free sheep wool insulation.
• High elasticity and density for a perfect custom fit.
• Protects insulation from internal and external moisture.
• Can be used for a variety of roof types and installation methods.

The FAKRO XDK Insulating Set is designed to provide both internal and external insulation around your roof window installation. It combines two key components – the FAKRO XDP (external insulation and air-permeable collar) and the FAKRO XDS (internal air-tight collar) – into one convenient kit.

If you don’t require the full set, the XDP Insulating set and XDS air tight flashing components are also available to purchase separately.

Perfect for professionals and DIYers alike, the FAKRO XDK Insulating Set is the ideal choice for achieving a fully sealed, energy-efficient roof window installation.

Please Note:

These flashing kits are not available for standard delivery. Estimated delivery time is 15–20 working days from the date of order. For full details, please see the Delivery tab below.