A bed of gravel, layer of gravel or bed of pebbles is generally used for the purpose of stabilizing a building. This phase represents an important step in the earthworks. Update on the use, composition and implementation of the gravel bed...
What good is a bed of gravel?
Laying a gravel bed is a step that is often used in earthworks. This layer is generally placed at the level of the foundations in order to stabilize the whole of the final construction. Moreover, in professional jargon, we speak of " stabilization layer ". It can be the foundations of a building, but also the installation of a terrace, a greenhouse or a swimming pool. The presence of the gravel bed contributes to stability and longevity of edification.
This is to neutralize the pressures on the construction and different constraints come into play. We must take into account the weight of the building but also the ground pressures. These are fairly consistent and can change throughout the year, depending on the humidity.
Gravel particle size and specificities
When gravel is used to build foundations, small to medium (20/40) grains are usually used, depending on the structure to be supported. In the case of slabs or garden paths, the particle size is larger. It is important to emphasize that rules must be placed on both sides of the site to check the thickness.
The gravel bed is associated with other elements to constitute a stable base, solid and durable such as laying the geotextile film (to avoid rising damp), the metal grid, the concrete layer. Depending on each project, the professional earthworker decides on optimal associations, making every effort to build a solid construction.
What kind of gravel? Price?
The gravel can be declined in different sizes. In general, for earthworks and drainage the professional uses crushed gravel 20/40. The price is around 20 euros per ton. This type of gravel makes it possible to prevent the layer in place from settling over the years, pressures and bad weather.
The rolled gravel (about 40 euros / ton) or the decorative gravel (price very variable according to the quality) is not suitable for the earthworks. This type of gravel is used to the slabs and garden paths. The same is true for limestone gravel because it can break up under pressure, which can cause instability of the whole structure and cause cracks in the walls.