Underfelt Collar

To ensure that your roof window is fully air-tight and has the correct level of insulation we have a range of products to do this.  These products not only ensure that your window will be extremely energy efficient but as each is made to measure the exact window sizes, they are quick and easy to install.

• Ensures a watertight seal between the roof window and the roof
• The collar is made from diffusion material to minimise the risk of condensation
• This product comes with a transverse drainage gutter. This gutter leads water away from the top of the roof window if a tile or slate is broken above the window.