Pave the driveway: Which slope is necessary?


When paving, the information on the necessary gradient is always a little apart. What you really need where and where only a very small gap must be planned, you can find out in this post. In addition, what the gradient still depends on.

Why gradient?

Paving often uses stones that water can not penetrate. After heavy rain, the water would otherwise stop, form puddles and in winter it would also result in dangerous ice. In addition, constantly standing water is not advantageous for joints and paving.

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

Necessary gradient

Right at the beginning: there is no uniform, always the same guideline value for every gradient at each entrance. A gradient always has different strengths - depending on which area it is. There are a few other factors as well:

  • the roughness of the surface (smoother surfaces need less gradient)
  • the use of the driveway (as a garage entrance, as access to the house, etc.)
  • the maximum amount of water

Gradients are always given in%. In this case, 1% slope means a height difference of 1 cm per run length of 1 m.

Differently explained: 1% gradient prevails, if with a 1 m long entrance between the two ends a height difference of 1 cm lies. If the driveway is 3 m long and the difference in height is 6 cm, then the driveway has a gradient of 2%.

benchmark

For a sufficient surface drainage, a gradient of 2 - 3% is normally used. With particularly uneven pavement (such as cobblestones), a higher value can sometimes be useful.

On the other hand, with stones that are permeable to water (permeable to water), the gradient can also be slightly lower because at least part of the water seeps away. Without a slope you should not build a driveway - not even with oozing stones.

Longitudinal and transverse gradients

It always depends on where you want to direct the water. Anyone who has a green area next to the driveway can also derive the surface water from the driveway there. So that the water flows not only along the driveway but also on the side, you also need a corresponding cross slope. Also, this slope must be planned with, when building the ballast bed.

Tips & Tricks

If you derive too much water in green areas with peaty or loamy soil (= bad infiltration ability), these can become dull. So always pay attention to their soil conditions and plan your drainage accordingly.


Video Board: How To Prepare And Lay A Base For Pavers - DIY At Bunnings