The foundation on a hillside

The ground for a foundation is not always ground level. Creating a foundation on a hillside is sometimes a real challenge. Below you will find information on what additional measures can be taken for a hillside foundation.

Scope of the construction project

First, it should be noted that foundations are needed for a variety of construction projects. This starts with small projects such as the foundations for a mailbox or a garden fence, and extends from DIY enthusiasts to building foundations subject to building permits.

building permit duty

We would already be at a first differentiation option:

  • Foundation for construction projects, not subject to building permit
  • Foundation for construction projects, building permit required

For building projects subject to building permits, DIN 18195 must be taken into account.

Designs for foundation on a slope

Now there are several ways to build on a slope:

  • into the hillside
  • "Put on" on the slope with stilts
  • the split-level construction

The hydrogeological ground survey

In any case, a hydrogeological soil assessment must be prepared in advance. The requirements are even higher here compared to a conventional ground, as it can also be determined how far the slope "pushes". If there are already solid roads or roads or other buildings around the slope, cracks can be very enlightening.

The concrete requirements for the foundation on a slope can not be answered in a general way. It makes a big difference whether it is a flat, 20 m uplifting elevation to build or whether it is on a steep alpine slope. Already the different designs for the foundation or the building presuppose that they can be applied under the prevailing situation.

Different designs for the foundation

It may be necessary to make a deep foundation on pillars or stilts for the foundation on a slope. Then there is still the possibility of the foundation on stilts, that the foundation rises above the ground hub, so it is built on the slope so to create a level.

In most regions in this country is common but building in the slope into it. Often buildings are then on the slope side in the plane on the foundation basement and forward ground floor. This design may require different measures. For example, a retaining wall between slope and building, ie at the foundation connection. Likewise, a socket running around the building can take place. In addition to a sinking a deep foundation.

Take into account the slope-side drainage

But that's not all. The groundwater is often not a problem on a slope, because the level is much lower. But leachate like rainwater or meltwater. The building foundation with the basement outer walls on the slope can act as an obstacle here and dammage running water. This can lead to the need for adequate drainage or drainage. In addition, a dry layer of crushed stone under the foundation must be sufficiently strong.

Tips & Tricks

For a large hillside foundation, forcing the help of certified experts is required. Depending on the characteristics of a slope, the requirements can be extremely high.

Product Image: Lukas Hodon / Shutterstock

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