The insulation frame BDX insulates around the roof window frame, reducing heat loss and eliminating cold bridges. The combination of rigid and flexible foam ensures a tight, energy-efficient installation to the roof construction.
The flexible insulation frame can be compressed for quick installation.
The underfelt collar BFX ensures a perfect fit and watertight seal between the roof window, battens, and the roofing underfelt. It is easy to fit. Simply place on top of the roof window and unfold.
An adjustable and self-supporting drainage gutter is included in the BFX. This leads the water away from the head of the roof window if there is a leak above.