VELUX BDX MK04 2000F Insulation and Underfelt Collar - 78cm x 98cm

Insulation collar - BDX , Insulates around the roof window frame, reducing heat loss and eliminating cold bridges. , Makes insulating and installing the window a simple process. , Click fittings ensure a fast and accurate assembly. , Comes with an underfelt collar - BFX. Underfelt collar - BFX , Ensures a weather-tight seal between the roof window and the roof. , Pleated material ensures a flexible and tight seal to the underfelt of the roof, whatever it's construction. , Made from diffusion open material to minimise the risk of condensation. , Comes with transverse drainage gutter to lead water away from the head of the window if a tile or slate is broken above the window. , Welded corners ensure a watertight and simple installation.. VELUX BDX MK04 2000F Insulation and Underfelt Collar - 78cm x 98cm