Pave the driveway: which slope is necessary?

When paving, the information on the necessary gradient always differs a little. In this article, you can find out what is actually needed where, and where only a very small gradient has to be planned. In addition to what the gradient still depends on.

Why gradients?

Stones that water cannot penetrate are often used in paving. Otherwise, after heavy rain, the water would stand still, form puddles and, in winter, dangerous black ice would develop from it. In addition, standing water is not beneficial for joints and paving.

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In order for the water to flow off the surface, this surface must have a slope. The gradient must always be from the house or garage lead away.

Necessary gradient

First of all: there is no uniform, always the same guide value for every slope at every entrance. A gradient always has to vary in strength - depending on which area it is. In addition, a few other factors also count:

  • the roughness of the surface (smoother surfaces need a little less slope)
  • the use of the driveway (as a garage entrance, as an entrance to the house, etc.)
  • the maximum amount of water that accumulates

Gradients are always given in%. A gradient of 1% means a height difference of 1 cm per 1 m run length.

In other words: there is a 1% gradient if there is a height difference of 1 cm between the two ends of a 1 m long driveway. If the driveway is 3 m long and the difference in height is 6 cm, then the driveway has a gradient of 2%.

Guideline

For sufficient surface drainage, a gradient of 2 - 3% is normally used. In the case of particularly uneven pavement (e.g. cobblestones), a higher value can sometimes be useful.

On the other hand, in stones, which are water-permeable (leachable), the slope can also be slightly lower, because at least part of the water seepy. Quite without gradient you should not build a driveway - not even with sick-capable stones.

Longitudinal and transverse gradient

It always depends on where you want to go to the water. Who has a green strip besides the entrance, can also derive the surface water from the driveway. So that the water flows out not only along the entrance but also laterally, you also need a corresponding crossfill. This gradient must also be planned when you build the gravel bed.

Tips & Tricks If you derive too much water in green areas at goalfigem or loamy floor (= bad seepiece capacity), these can do it. So always pay attention to your soil condition and plan your drainage accordingly.