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Underfelt collar (BDX)
For the ultimate in hydro and thermo insulation, we recommend our BDX insulation. The installation set includes all you need for a weathertight window: an insulating frame, an underfelt collar and a drainage channel.
Our insulating frame reduces heat loss by eliminating thermal bridges between the window and your roofing material – and the underfelt collar forms a tight seal between the window and the inside of the roof or felt underlay. The drainage channels above the window carry away water as it runs down the roof.
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