Water nose
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Water protrusions (also called drip edges or drip strips ) are edges on the underside of protruding components - for example window sills , balconies or wall crowns - which improve the drainage and dripping of (rain) water and thus the moisture penetration of components and dirt trails through the underside of the Avoid running water on the facade.
Rainwater that runs off drips off the water nose without wetting the entire underside of the surface or the wall running perpendicular to it.
A groove running parallel to the outer edge is often milled in on the underside of wooden components in order to expose the outer edge. In the case of concrete components, the drip edge is usually created during production by a strip inserted into the formwork, which is removed after the concrete has set and leaves a groove. Subsequently attached drip edges often consist of a sheet metal protruding downwards or folded downwards.
Traditionally, the drip edge of windows and doors was on the lower edge of the weather bar . Since this is mostly not used today, the drip edge is provided directly on the underside of the wing. In the case of wooden components that serve as a drip edge, a suitable impregnation or coating should prevent the water that collects on the drip edge from being sucked into the wood.
Natural and artificial stones as well as concrete components must not absorb too much water at the drip edge, as otherwise it can break off and crack in frost.
The settlement of drip edges on concrete components is regulated in DIN 18 349 concrete maintenance work, Section 4.2.17 Forming grooves, edges and water drip edges . According to this DIN from VOB / C, drip edges are billed as a special service.