Velux BFX MK06 1000 Underfelt Collar

The Velux BFX 1000 Underfelt Collar offers a strong connection between the roof window and membrane. It helps reduce harsh weather penetration and cold air from entering your property.

It is supplied in one piece ensuring it is easily installed around windows, corners and frames.

Includes a drainage gutter which will lead water away from the top of the window if there is any broken roof material above it.

It will help maintain your property and ensure a professional finish.

Velux BDX MK06 2000F Insulation Collar for Recessed Installations

For the ultimate in insulation, we recommend our BDX Insulation Collar.
It reduces heat loss by eliminating thermal bridges between the window and your roof structure. Also comes with BFX Underfelt Collar.
Technical details

  • Underfelt material: frothed polyethylene, heat transfer group 040.
  • Collar material: polypropylene.
  • Material thickness: 0.5 mm.
  • SD value (water vapour diffusion resistance): 0.03 m.