The foundation on stilts

Not every floor is equally suitable for a construction project with foundations. If the soil is too soft, therefore, a deep foundation is sought. In principle, this is a foundation on stilts.

Foundation on stilts for buildings

The following description of the foundation on stilts or a deep foundation refers to the foundation for conventional buildings such as a family home or two-family house. It may also be advantageous for small construction projects to additionally base the foundations on stilts.

The soil report provides information about the soil condition

In a house construction, the hydrogeological soil assessment is now mandatory and mandatory by law. Unfortunately, not the scope of the soil survey. Here it turns out, however, that you should rather turn down the seemingly cheap soil appraisal from the internet, which is carried out by non-local or regional landowners.

Because these are often not so well familiar with the hydrogeological characteristics. A body of water can quickly be disregarded because the appraiser is not aware that in the case of frequent floods, it can also influence the groundwater level far from the actual construction project. This need not be a lack of expertise. Often it may be a peculiarity of the water due to geology.

Different floors are simply not sustainable and can sit solid

If the surface is problematic, this can lead to a long-term and significant settlement of the structure. For clay soils, this effect can last for decades. Even the foundation on clay soil is problematic. The clay soil (a form of the clay soil) has a very fine grain, which is massively compacted.

When and why building on stilts or deep foundations is necessary

Nevertheless, the grains are separated by a layer of water. There is virtually no frictional resistance. Colloquially one would probably say, the underground works and slip downright. This effect can be promoted by a heavy structure. So appropriate countermeasures must be taken. First, a look at the properties of different soils. Here are the following differences:

  • a binding ground
  • a non-binding ground

Gravel and gravel: Foundation without stilts unproblematic

Gravel or gravel does not bind. As a result, the material compresses very quickly and at the same time minimally. This means that within a very short time the floor has completely set after being loaded by foundation and structure. In addition, water can run well due to the large cavities, without these could be compressed.

Other soils necessarily require deep foundation

The smooth opposite is peat soil. This too is very loose, so has many cavities. Only that they collapse under heavy load and the soil is compressed further and further down. The compression can mean many meters over long periods of time.

This is how the foundation works on stilts or deep foundations

These soil textures can be overcome in a foundation if there are solid soil layers underneath, for example if the problematic soil area is merely a limited clay or peat lint.

In most cases, that would be far too deep for the actual foundation. Therefore, a depth foundation is chosen here, which is then based on this solid soil layer. A deep foundation is nothing more than stilts, which are rammed into the ground at regular intervals and later record the foundation.

Tips & Tricks

Incidentally, this is the typical method of construction in countries with rainy seasons or monsoons, as the soil often softens during the rainy season. Building on stilts ensures that buildings and other structures can not set dangerously.

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Video Board: Tiny Home Building - Cutting The Foundation Posts - Building On Stilts