The VELUX insulated installation system consists of:

BDX insulation frame. This thermal insulation around the window is made from 2-layer polyethylene. It provides effective insulation of the window area because it fits the window and roof structure perfectly. It protects the junction between the window and roof from rainwater.

BFX moisture protection: ensures resistance to moisture and wind while maintaining the necessary ventilation of the lower roof layers. It fits the window and batten structure perfectly.

a drainage gutter that carries away moisture which may occur beneath the roof covering

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