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Roof drainage - drainage from a roofIn a flat roof, another variant for roof drainage is required, as is the case with a pitched roof. With a pitched roof, rain and snowmelt can easily drain off over the existing incline.
This is not possible due to the design of a flat roof, so that here a detailed calculated system for roof drainage must be used. For this purpose gullies as well as a drainage channel and an emergency overflow are possible.
Dimension the roof drainage correctly
Particularly important is the right dimension of the roof drainage of a flat roof. Here are two special values to consider: the so-called rainfall and rainwater runoff.
Rainfall is a statistically determined value that measures the largest rainfall of the last five years at one location. This value per hectare was divided by 10,000 and thus comes on the rainfall in square meters. If this value is then multiplied by the underlying surface area of the roof, then the rainwater drainage results.
The do-it-yourselfer does not have to take the slide rule in his hand at this point, then in a roof-mounted workshop you can easily ask for the values for the roof drainage on the flat roof. Besides this data is
for the drainage of the flat roof and the slope of the roof crucial.
Types of roof drainage
In a pitched roof usually an external roof drainage is attached. This is also possible with a flat roof,
but only if, due to the structural conditions, there is a corresponding gradient. Since this is not the case with most flat roofs, a so-called. Interior roof drainage is made.
Here, a gully can be used as so-called point drainage. Also conceivable are plants with a linear drainage, which are realized by a trough or drainage channel. Both variants can be used independently of the gradient.
When roof drainage from a flat roof must also be thought of an emergency overflow, which is important in heavy rain. A heavy rainfall clearly exceeds the expected rainfall, so that the emergency overflow creates an additional drainage option for the rain.
Incidentally, a drain is completely sufficient for roof drainage if, together with a linear drainage, it can cope with the statistically determined saving of the century. However, since the public sewer system is heavily loaded during such heavy rain, the emergency overflow should divert the water to an open area.