| 摘要 |
A roof window (1) having a roof window frame (2, 7) and sash frame (8) and a covering member (3) for weather proofing the roof window. The covering member (3), the frame (2, 7) and sash frame (8) defining a channel (4) there between capable of communicating fluid. A vapour barrier (5) is disposed in the fluid communicating channel (4) for preventing the flow of vapour along at least part of the fluid communicating channel (4). |
