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The flashing component comprises a rigid flashing frame arrangeable against outer side faces of the main frame component and foldable resilient side flashing members, which can be folded to allow packing of the flashing component together with the window and main frame components into a single unit

The flashing component comprises a rigid flashing frame arrangeable against outer side faces of the main frame component and foldable resilient side flashing members, which can be folded to allow packing of the flashing component together with the window and main frame components into a single unit comprising all components needed for installation of the roof window assembly.

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The invention claimed is: 1. A flashing component for connection with external surfaces of top, side and bottom faces of a main frame component of a roof window assembly to provide a weather-proof joint of the roof window assembly with a surrounding roof-covering, comprising: four interconnected si

The invention claimed is: 1. A flashing component for connection with external surfaces of top, side and bottom faces of a main frame component of a roof window assembly to provide a weather-proof joint of the roof window assembly with a surrounding roof-covering, comprising: four interconnected sides defined by a first plurality of flashing members of a substantially rigid material for arrangement against said external top, side and bottom faces, said four sides together defining an opening through the flashing component, wherein said opening is adapted to receive said main frame component of a roof window assembly and wherein two of said four sides are longer than the other two sides, and a flashing member of a resiliently foldable material connected with each of the flashing members of a substantially rigid material that define the two longer sides, no flashing member of a resiliently foldable material being connected with either of the flashing members of a substantially rigid material that define said other two sides. 2. A flashing component as claimed in claim 1, wherein said first plurality of flashing members form a flashing frame including two side members, and wherein the side members of the flashing frame are of a generally L-shaped cross-section comprising a first wall part for connection with said external side face of the main frame component and a second wall part for connection with a respective flashing member of a resiliently foldable material. 3. A flashing component as claimed in claim 2, wherein said second wall part of the side members of said flashing frame is formed with an upwardly projecting folded portion extending in parallel with said first wall part to define a water channel along a side of said roof window assembly. 4. A flashing component as claimed in claim 3, wherein an edge of a respective flashing member of said second plurality is accommodated in the upwardly projecting folded portion. 5. A flashing component as claimed in claim 2, wherein the flashing members of a resiliently foldable material are triangular with a width increasing in the direction from the top member to the bottom member of the flashing frame. 6. A roof window assembly comprising a substantially rectangular main frame component for stationary connection with supporting means of a roof structure and composed of top, side and bottom members and a substantially rectangular window component with a glazing element engaged along all sides by a window frame, and a flashing component to provide a weather-proof joint of the roof window assembly with a surrounding roof-covering, said flashing component including four interconnected sides defined by a first plurality of flashing members of a substantially rigid material for arrangement against said external top, side and bottom faces, said four sides together defining an opening through the flashing component, wherein said opening receives said main frame component of a roof window assembly and wherein two of said four sides are longer than the other two sides and a flashing member of a resiliently foldable material connected with each of the flashing members of a substantially rigid material that define the two longer sides, no flashing member of a resiliently foldable material being connected with either of the flashing members of a substantially rigid material that define said other two sides. 7. A roof window assembly as claimed in claim 6, wherein said first plurality of flashing members form a flashing frame including two side members, and wherein the side members of the flashing frame are of a generally L-shaped cross-section comprising a first wall part for connection with said external side face of the main frame component and a second wall part for connection with a respective flashing member of a resiliently foldable material. 8. A roof window assembly as claimed in claim 7, wherein said second wall part of the side members of said flashing frame is formed with an upwardly projecting folded portion extending in parallel with said first wall part to define a water channel along a side of said roof window assembly. 9. A flashing component as claimed in claim 8, wherein an edge of a respective flashing member of a resiliently foldable material is accommodated in the upwardly projecting folded portion. 10. A roof window assembly as claimed in claim 7, wherein the flashing members of a resiliently foldable material are triangular with a width increasing in the direction from the top member to the bottom member of the flashing frame. 11. A roof window assembly comprising: a substantially rectangular main frame component for stationary connection with supporting means of a roof structure and composed of top, side and bottom members and a substantially rectangular window component with a glazing element engaged along all sides by a window frame, a flashing component to provide a weather-proof joint of the roof window assembly with a surrounding roof-covering, said flashing component including four interconnected sides defined by a first plurality of flashing members of a substantially rigid material for arrangement against said external top, side and bottom faces, said four sides together defining an opening through the flashing component, wherein said opening receives said main frame component of a roof window assembly and wherein two of said four sides are longer than the other two sides, and a flashing member of a resiliently foldable material connected with each of the flashing members of a substantially rigid material that define the two longer sides, no flashing member of a resiliently foldable material being connected with either of the flashing members of a substantially rigid material that define said other two sides, and a number of mounting brackets fastened to at least the side members of the main frame component. 12. A roof window assembly as claimed in claim 11, wherein each mounting bracket comprises a first leg fastened to one of the side members of the main frame and a second leg resting on a sheathing of the roof structure. 13. A roof window assembly as claimed in claim 12, wherein at least one opening for a mounting means is provided in the second leg of each mounting bracket at a position covered by a respective flashing member of resiliently foldable material.