| 摘要 |
A roof accessory for a projection on roofs, such as dormers, oriels, lucarnes and the like, comprises a cross drain (1, 2, 4) in a transitional area between roof and projection roof The present cross drain is characterised by a pair of sub-strips (1) for mounting on rafters which are an integral part of the roof and the projection, with one on the roof rafters and the other on the projection rafters and at a distance from the line of intersection of the rafters, a first valley gutter (2) for mounting on top of the sub-strips (1), so that an angular area between the sub-strips (1) is covered, and a second valley gutter (4) for mounting on top of the first valley gutter (2) when a roof covering has been installed on the roof and the projection.
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