Construction of a garage does not begin with the purchase of bricks or the installation of gates, but with the laying of a reliable foundation that will keep the entire structure for decades. Exactly the quality. foundation It depends on whether cracks in the walls will appear in a year or the floor will be so skewed that the gates will stop opening. The choice of base type is directly dictated by the characteristics of the soil, the weight of the planned construction and the level of groundwater on the site.
Many motorists make the mistake of believing that for a light metal construction, it is enough to simply pour a concrete platform without going into geology. This approach often leads to the fact that the forces of frosty bloating in winter push the structure, and in the spring it sags, collapsing unevenly. To avoid expensive repairs in the future, you need to determine the type in advance. load-bearing and strictly observe the technology of its construction.
In this article, we will analyze all the existing options of bases, their pros and cons, and also help to understand what kind of foundation will be the ideal solution for your case. We will look at technical nuances that are often ignored but are critical to the longevity of a structure.
Factors affecting the choice of base type
Before purchasing materials, it is necessary to conduct a thorough analysis of the site, since it is the geologic conditions They dictate the choice of technology. Ignoring the soil composition can cause even the most expensive and powerful foundation to collapse under the influence of natural processes. Soils are hollow, which increase in volume when freezing, and non-bulky, stable all year round.
The most important parameter is the depth of freezing in your region, which can range from 0.8 meters in the south to 2.5 meters in Siberia. The base should be laid below this mark or be isolated from the bundle in a special way. The level is critically important. groundwaterIf the water comes close to the surface, a complex drainage system or a different type of design will be required.
Do not forget about the material of the walls of the future garage. Lightweight constructions made of flooring or sandwich panels do not require massive support, while a brick or foam garage creates a significant load. Weight motor-carryingThe slug you plan to store also makes its own adjustments to the load-bearing capacity calculations.
The tape foundation: the classic of reliability
The belt type of base is the most popular solution for capital garages made of bricks, blocks or aerated concrete. It is a closed circuit of the reinforcedIt transfers the load from the walls to the ground along its entire length. This is a universal solution that allows you to organize an observation pit or a full-fledged basement for storing stocks.
There are two main types of such tapes: shallow-deep and buried. The shallow-deep version is suitable for non-bulky soils and light buildings, laid at a depth of 0.5-0.7 meters. The submerged foundation falls below the freezing level, which requires more excavation work, but guarantees stability even with high water levels and heavy walls.
Tape reinforcement technology
To enhance the strength inside the formwork is laid frame of reinforcement diameter of 10-12 mm. The rods are connected by wire in two or three belts, ensuring the work of concrete for stretching and compression.
The main advantage of the tape is the ability to distribute the load evenly, which is especially important with heterogeneity of the soil. However, the construction process is laborious: digging trenches, installing formwork, knitting the valves and waiting for a set of strength is required. concrete-mixture.
- 🏗️ High load-bearing capacity allows you to build two-storey garages with an attic.
- 💰 The optimal ratio of price and quality for capital buildings.
- 🛠️ The possibility of combining with an observation pit or cellar.
Monolithic plate: maximum strength
If your site is complex soils, such as peatlands or swimmers, or the water table is very high, the best choice will be a monolithic plate. It's all solid. concrete-baseIt works as a whole, "floating" with the ground during its movements. This foundation is often called “floating” because of its ability to compensate for deformation of the soil.
The stove performs two functions at once: it serves as the foundation for the walls and at the same time a ready-made floor in the garage. This eliminates the need to make a separate screed, which speeds up the process of commissioning the object. The thickness of the plate is usually 20-40 cm, depending on the weight of the building and the characteristics of the soil.
When pouring the plate, be sure to use waterproofing (geotextiles and dense film) under the concrete to prevent moisture from leaving the solution into the ground and ensure proper hydration.
The disadvantages include high consumption of materials: concrete and reinforcement are required much more than for tape. In addition, it is difficult to organize a deep cellar on such a plate, although a small observation pit can be made at the pouring stage.
- 🛡️ Perfect stability on any, even the most problematic soils.
- 🚗 The finished floor immediately after drying, convenient for the car.
- 📉 Minimal shrinkage and no cracks in the walls.
Pillars and piles foundations
For light garages made of wood, flooring or foam blocks of small storeys, columnar and pile bases are excellent. The essence of the method is that the load is not transmitted throughout the area, but pointwise, through supports buried in dense layers of soil. This allows you to significantly save on materials and volumes of earthworks.
The pile-screw foundation is mounted very quickly: special metal pipes are screwed into the ground by hand or by machinery. The tape roastwork connecting the headers of the piles can be made of a channel, a timber or filled with concrete into the formwork. This technology is especially relevant for areas with a large elevation difference.
⚠️ Note: When using a pile foundation, the garage floor will be "floating." You will have to separately organize the covering of boards or pour a thin screed on the ground, which can be uncomfortable in the presence of an observation pit.
A columnary foundation of concrete blocks or brick is often chosen for budget construction. However, it requires quality insulation of the lower part (tick) to protect the space under the garage from blowing and cold in winter.
- ⏱️ Speed of installation: garage on screw piles is assembled in 1-2 days.
- 💸 Low cost of materials and work compared to the stove.
- 🌲 Minimal interference with the landscape and the possibility of building on the slopes.
Comparison of cost and labour costs
When choosing a foundation, the economic component often becomes decisive. It is necessary to take into account not only the cost of materials (concrete, reinforcement, formwork), but also labor costs, as well as the need to attract special equipment. The leader in cheapness for lightweight structures is a columnar foundation, and the most expensive is a monolithic plate.
However, in the long run, the savings on foundations may come out sideways. Repair of cracked walls or skewed gates will cost more than the original higher-quality base. Therefore, the calculation should be carried out taking into account the service life of the building.
The table below compares the basic parameters of different types of foundations for a standard garage of 6x4 meters:
| Foundation type | Concrete consumption | labour-intensiveness | Duration of construction | Where applicable |
|---|---|---|---|---|
| Tape | Medium. | Tall. | 14-20 days | The hollow ground, we need a basement. |
| monolithic plate | High-pitched | Medium | 20-25 days | Weak soils, high waters |
| Pile-screw | Low. | Low. | 1-3 days | Slopes, any soils, light walls |
| Columnous | Low. | Medium | 7-10 days | Dense soils, light buildings |
Calculation of materials and depth of laying
In order for the foundation to withstand the load, it is necessary to correctly calculate its parameters. The depth of the foundation depends on the type of soil and the climatic zone. For pulpy soils, the depth should be greater than the depth of freezing, or the foundation should be insulated. The calculation of the volume of concrete is carried out by the formula of the volume of a geometric figure (parallelepipede for tape or plate).
It is used for reinforcement steel-bar Class A-III (A400). The diameter of the bars is chosen based on the load: for a private garage, 10-12 mm is usually enough. The step of the cell of the reinforcement frame is usually 200 mm.
☑️ Checking the filling readiness
The brand of concrete also plays a key role. For the foundations of garages, it is recommended to use concrete brand M250 or M300. The use of lower grades, such as the M100 or M150, is only permissible for base preparation or very light temporary structures.
⚠️ Note: Do not skimp on the brand of concrete and the quality of the valves. The funnel is a hidden job, and correcting errors after pouring will be almost impossible without a complete dismantling.
Technology of pouring and care of concrete
The process of filling the foundation requires compliance with technology. Concrete mixture is desirable to order ready-made in the mixer to fill the entire volume at one time, avoiding the formation of "cold seams", which reduce strength. If this is not possible, you need to pour layers, but always with the vibration of each layer to remove air.
After pouring, the most important stage begins - the care of concrete. In hot weather, the surface must be constantly moistened and covered with a plastic film so that the water does not evaporate too quickly. Drying leads to the formation of microcracks and reduced strength.
The full strength set occurs within 28 days, but you can remove the formwork after 7-10 days in good weather. Before the end of this period, it is not recommended to load the foundation with the weight of walls or heavy equipment.
The quality of the foundation depends on 80% of the proper maintenance of the concrete in the first week after pouring, not just on the brand of the mixture.
Frequently Asked Questions (FAQ)
Can you build a garage without a foundation?
Technically, it is possible to put a lightweight metal garage on a prepared ground of rubble or slabs, but this will be a temporary solution. The lack of a foundation will lead to freezing of the floor, dampness inside and rapid destruction of the structure due to ground movements.
How deep do you dig under the foundation for a garage?
For a belt foundation on hollow soils, the depth should be below the depth of freezing (usually 1.2-1.5 m). For non-fluffy soils or when using insulated plates, 0.5-0.7 m is sufficient.
Do I need to waterproof the garage foundation?
I will. Capillary lifting of moisture from the ground will lead to dampness in the garage, corrosion of the car and destruction of concrete. Use asphalt mastic or roll materials for vertical and horizontal insulation.
What is the cheaper garage 6x4?
The cheapest option is usually a columnar foundation of blocks or pile-screw (subject to self-assembly). However, for the capital structure, the belt foundation is often more profitable in terms of service life.