Arrangement of the drainage system of the foundation

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Features of the drainage system under the foundation foundation

A slab( shallow) foundation is a design made of monolithic slabs located under the entire area of ​​the house. It is used for buildings of small area, since it has the property of giving undesirable shrinkage. And it is because of this structural feature that the drainage system is best equipped before construction begins.

Features of the drainage system under the foundation foundation

Step by step it looks like this:

  • Under the foundation, a trench is dug out, in which, to the greatest possible depth, drainage wells are drilled. It is necessary to take into account such a point as the freezing of the soil in winter, so the end of the well should be located below this level.
  • Further in the wells are placed drainage pipes, with the distance between them being within 3 m;
  • All the rest of the space is covered with large rubble or gravel;
  • A layer of concrete is poured over the layer of rubble, after solidification of which, a trench is excavated from the outside of the building and covered with rubble;
  • The final stage is the erection of a blind area about 1 m wide.

Features of the drainage system under the foundation foundation

This method will provide maximum drainage and is the most effective in this case. However, if the house is already built, and there is no drainage, you can use an alternative method of its arrangement.

To do this, along the entire perimeter of the construction, a ditch is dug with sufficient width and depth, the bottom of which is covered with a layer of crushed stone 10 cm high. After it is thoroughly compacted, a slope of 5 cm is formed for every 10 pipes, with a smaller slope, water retention and the formation of puddles are possible. Drainage pipes are laid and combined into a single structure, the end of which goes into the collection drainage well.

Features of the drainage system under the foundation foundation

However, before proceeding with the work on the arrangement of the slab foundation with sewage, it is necessary to foresee and take note of the following:

  • Depth of freezing of the soil at the lowest possible temperatures;
  • Composition of soil( clayey, sandy, etc.)
  • Depth of foundation and its location relative to underground channels;
  • Periodicity and intensity of atmospheric precipitation in a given region.

Draining of shallow strip and column foundation

To provide drainage of the tape or column foundation, perform the following types of work:

  • A trench is digging around the perimeter of the house, the depth of which is greater than the depth of the foundation itself and a slope of 5-9 degrees;
  • At the bottom of the ditch is laid out broken brick or large rubble;
  • On top of them lay special drainage pipes, connected in a single system, at the end of which a water well is installed;
  • After that, the entire structure is covered with a geotextile fiber;
  • On top of it another layer of crushed stone is poured and reinforcement is made of branches, the function of which is to strengthen the main overlapping in the form of soil;

Drainage of shallow belt and columnar foundation

Pipes for drainage

Manufacturers of building materials provide a fairly large range of ready-made sewer and drainage pipes. A distinctive feature of such products is the presence along the entire length of the tube of small holes with a diameter of up to 5 mm to drain water. The diameter of the pipe itself varies within 110 mm.

Pipes for drainage

The most popular are polymer pipes, due to their durability and exceptional performance:

  • The rigidity of products ensures their high strength;
  • Anti-corrosion and chemical resistance;
  • Thanks to a smooth internal surface, no deposits are formed on the walls, which would prevent the flow of moisture;
  • Acceptable cost;

It is possible to visually assess the overall simplicity of the drainage device of the slab foundation by viewing the video.

Pipes for drainage

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