Everything you need in one box for a weathertight installation – with added insulation.
Ensure a watertight seal between the roof window and the roofing underfelt with the VELUX underfelt collar that leads water away from the roof window installation.
Reduce heat loss and eliminate cold bridges with the VELUX insulation frame. The combination of rigid and flexible foam creates a tight seal between the roof window and the roof construction and makes it easy to install.