Roof tube and method for producing such a roof tube

摘要

The invention relates to a roof duct for a flat roof for draining rainwater or for carrying conduits through the roof. The roof duct consists of a metal tube forming the actual duct and a sheet-like part which is connected to the metal tube and which is manufactured from a flexible plastic. The sheet-like part is herein provided with an opening, an edge of which protrudes into the metal tube. The roof duct further consists of an inner tube, a first part of which lies against the inward protruding edge of the sheet-like part and a second part of which lies against the inner wall of the metal tube. For the purpose of fixing the sheet-like part the roof duct is provided with a constriction such that the edge of the sheet-like part is clamped between the metal tube and the inner tube.