# How to calculate the size of the foundation - the calculation of the foundation for the house

Calculating the size of the foundation for a house is a painstaking job that requires attention, because the quality of the elevated part of the house depends on its accuracy. As a rule, there is a standard system, it was composed by architects, it is quite simple and should not be used for houses of complex construction, as there may be some discrepancies. If you want to learn how to do it right, read on ....

The most basic task of each developer is to build a foundation that is durable and reliable, and in order to meet the requirements, select the appropriate geometry. To make it easier to calculate, look at the finished foundations that are ideally suited to your architectural plan. Pay attention to the shape, quality and defects. They will tell you what mistakes were made at the time of construction.

## Parameters

Calculation of strip footing

After a visual inspection, you can feel free to start a full-fledged calculation, which includes the values ​​of the carrying capacity and the deformation of the soil at the site where the foundation will be erected. To do this you will need knowledge of mathematics and physics

The calculation of the bearing capacity is not complicated, difficult to deform - it should be done with professionals.

Calculation of the depth of the

Take, for example, a strip foundation. The following data will be required:

1. Soil quality.
2. Level of groundwater flow.
3. Mark of soil freezing.
4. External load on the roof.
5. Architectural design of the house.

Recommended proportions

Having objective data, you can proceed to the step-by-step calculation of the foundation.
The first stage is to determine the weight of the external structure of the house, which is above the ground, including the additional load from furniture, decorative finishes, etc., which will produce specific pressure on the bottom soil.
The second stage is geometry.
The third stage is the adjustment.

## How to determine the size of the foundation for an economy class house?

Project of the foundation

For this type of house, it is necessary to determine:

• the specific gravity of the external structure above the basement footing, taking into account the weight of the soil itself;
• the socle, including decorative finishes, floors and floor slabs;
• wall panels, not taking into account door and window openings;
• partitions with exterior and exterior trim. A similar calculation is made directly with the walls;
• the truss system and the ceiling, including the finish and roofing material;
• stairs;
• insulating layer.

You need a drawing paper, you will need to sketch all the structural elements of the house. The sketch should be as close as possible to the actual structure. At the end of the sketches, the determination of the volume of the structure is made according to the formula - ДхВхШ = V If it is necessary to determine the volume of a complex structure, it is necessary to divide the foundation into parts and calculate their volume using the proposed formula. The result is multiplied by the weight of the material of the structure. As a result, the weight of the structural element will be known, it must also be determined.
To find out the weight of the material, you need to multiply the resulting weight by preliminary calculations by the safety factor for the load.

The reliability factor depends on the nature of the load.

Calculation of the reliability coefficient - table

At the end of the summation, the weights of all the structural elements should turn out the weight of the whole house, in the sketch it is designated - "RK". The dimension of the weight at home is indicated in tons or kilograms.

1. Geometric parameters are determined taking into account the foundation depth, the parameters of the house plan, the material, the soil classification, as well as the planned structure.
2. A diagram and a sketch are drawn up according to the final calculations, where the width of the structure depends on the category of soil. It should be noted that the width of the soil, regardless of what soil it is arranged on, should not be less than 350 mm and less than the width of the walls of the house.
3. The height of the house depends on the size of the foundation plunged into the ground.

To determine the snow load on the roof of the house, the standard formula - Correction Factor X on RS is used, which results in the updated snow load RS *.