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Energy Efficient Recessed Slate Flashing for Profiles up to 8mm Thick This energy efficient recessed slate flashing comes with a BDX insulation collar and a BFX underfelt collar for optimal thermal performance. EDL - Standard slate flashings For slates up to 8mm thick Not for interlocking slate Flashings VELUX flashings integrate with the roof covering to provide a weathertight finish around the window. They are compatible with virtually any type of roofing material, from standard covers such as slate and tiles through to corrugated sheeting or even thatch. Flashings are designed to sit under the roofing materials. The water from the roof is then collected in the built-in guttering system. The gutter overlaps a second section of the flashing to help the water flow smoothly down the side of the window. BDX - Insulation collar Insulates around the roof window frame therefore reducing heat loss and eliminating cold bridges Makes insulating and installing the window a simple and quick process Click fittings ensure a quick and accurate assembly Includes BFX collar, see below BFX- Underfelt collar Ensures a weather-tight seal between the roof window and the roof Pleated material ensures a flexible and tight seal to the underfelt of the roof, whatever it's construction Made from diffusion open material to minimise the risk of condensation Comes with transverse drainage gutter to lead water away from the head of the window if a tile or slate is broken above the window Welded corners ensure a watertight and simple installation