It is one of the most commonly used methods of lowering the water table and is used around private houses with different soil types. Today we’ll talk about how to make drainage around the strip foundation.
What is a shallow strip foundation?
This is a monolithic concrete strip (with or without reinforcement), which is located under all the supporting structures of the structure (internal or along the perimeter). The term “shallow” means that the location of the entire structure is carried out above the level of soil freezing. This allows the structure to move with the structure under the influence of frost heaving forces..
With uniform movement, additional deformation loads are not applied to the foundation, it does not collapse, and remains reliable. The use of such a foundation is possible on heaving soils, where the forces of frost heaving are leveled.
What is strip foundation drainage
A circular drainage system around a building is used when the home is located on a plot of land with a high water table, or when the structure is erected on waterproof soil such as clay or loam. The advisability of creating a drainage system on such types of soil should be inquired from professionals in the field of geology and geodesy..
Tape drainage is a system of drainage pipes buried in the ground around a building. Perforated pipes are used for work. Water enters them through small holes, and a properly designed drainage system allows high-quality drainage of water from the house. You can often hear the phrase “strip drainage of the foundation”, since such structures are created at the foundations, both in houses with a basement and without a basement.
Whether a building requires district drainage depends on the water table, soil type and building structure. High groundwater levels are a risk for houses with a basement, as well as some structures without a basement. When deciding on the creation of a drainage system, it should be remembered that the level of groundwater can vary significantly throughout the year, especially in the spring after winter thaws. In such situations, it may be necessary to establish a drainage system even if the water table remains low for most of the year..
How to create drainage under the strip foundation?
For drainage, drain pipes with perforations are used, which allow water to flow into the pipe. Most often, these pipes are made of plastic. You can also find ceramics in stores. In addition, you need to select a suitable casing for the pipes. If the tape drainage system is created in clay, the use of a coconut shell is recommended. In the case of loose and mixed soils, the coating can be made of plastic. The pipe cover creates a blockage protection. An obligatory element of the system is also observation chambers, which are located in each corner of the building, as well as a collection chamber, which is mounted at the end of the drain. It is easiest to perform belt drainage on permeable soils. Then it is enough to dig holes around the supports at the appropriate depth and lay a filter layer on which the pipes are laid..
The drainage of a shallow strip foundation on waterproof soils, for example, clayey, is somewhat different. In this case, you must first perform a flat drain. Preparation for laying drainage begins with protecting the walls from moisture. Most often, a moisture-proof insulation and expanded polystyrene are laid, followed by a drainage layer. After work, the drainage process is similar to the process of permeable soils. The backfill is laid on the geotextile, and downpipes on it, which should be protected with a cover. Another layer of backfill and soil is laid on the pipes to fill the trench.