The VELUX BDX insulation frame and underfelt collar is an insulation frame for flush recessed and standard installs with flexible foam between the roof construction and the window frame. It provides a tight and secure fit to the roof construction. The pleated underfelt collar forms a tight seal between the roof window and your felt underlay.
The VELUX BDX Insulation collar insulates around a single roof window frame, reducing heat loss and eliminating thermal bridges. This product turns the insulation and the installation of the roof window in a simple process, ensuring quick assembly. The click-into-place fittings ensure a fast and accurate assembly.