VELUX BDX 2011 Insulation and Underfelt Collar

Insulation collar for EBL / EBW / EBP twin installations (18mm gap)

BDX - Insulation collar

• Insulates around the roof window frame therefore reducing heat loss and eliminating cold bridges
• Makes insulating and installing the window a simple and quick process
• Click fittings ensure a quick and accurate assembly
• Includes BFX collar, see below

BFX- Underfelt collar

• 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

Please note this BDX insulation collar cannot be used with recessed flashings.