How to determine the depth of the foundation for foam blocks

How to determine the depth of the foundation for foam blocks How to determine the depth of the foundation for foam blocks

You can talk for hours about how important it is for urban modern The car user has a private garage, and if you manage to find a building site near your place of residence, this can be considered incredible luck and is usually very expensive. The construction estimate is very limited in terms of financing, and therefore it is required to build a garage from foam blocks with your own hands.

It remains to resolve the issue of the optimal depth of the foundation for foam blocks.

What type of basis to choose

The answer is very simple - the one that you can afford. For the arrangement of the base, you will need to allocate approximately half of the available amount.

A normal garage should be built with warm, hard and red bricks. In this case, the depth of the foundation system can be made relatively small. An inexpensive foam block will require a very childish and solid base, which means that the savings on the walls will be used to increase the depth of the base for the foam block garage.

For such a garage, any of the following foundation foundation schemes can be used, in addition to the columnar version and the system on bored piles:

  1. The foundation pile system of reinforced concrete driven construction piles. The immersion depth of the support elements makes it possible to withstand even a brick two-story house.

  2. Slab base ideal for garages with heavy machinery and a large number of tool and part racks. The shallow planting depth makes it possible to install on any land on a relatively flat area.
  3. The pile-tape or tape option is perfect if a small inspection pit or basement is provided in the garage.
  4. Shallow version or a combination of pile supports and MZLF. The embedment depth of the foundation structure is very small, the excellent rigidity provides the foam block walls with a normal degree of stability.

Naturally, when choosing the depth and type of embedding of the base of the foundation, first of all, it will be necessary to take into account the characteristics of the earth and the terrain.


Counting and selection of the foundation for a foam block garage

Each of the options below is required in detail calculate the costs of purchasing materials, carrying out earthworks to the depth of laying the foundation, installing reinforcement and concrete work. In order not to be mistaken with expenses, it is required to complete a full-fledged design of a garage structure with detailing of all the main nodes and characteristics of the foundation for foam block walls, including the number and depth of reinforcement. In a simplified form, only the price and rigidity of the base can be compared:

Now let's take a closer look at everything.

The conventional price of a foundation for a garage made of foam blocks

In fact, the slab type of foundation will be the ideal type of foundations for walls made of foam concrete.

A concrete pad with a embedment depth of 0. 2 meters and a two-layer reinforcement with a bar of hot rollers makes it possible to "drive out" the walls 2.5-3 meters high and create a full-fledged single-slope or double-slope roof with insulation. The cost of creating a base for a foam block garage:

  • Provided that the depth of the pit is 0.4 meters and the size is 4.

    5 * 6 meters, the price for earthworks with filling a pillow and removing garbage will be from 15,000 up to 19,000 rubles.

  • Spending on concrete slabs with assembly and tying of reinforcement is 850 rubles per cubic meter + 30,000 rudders for concrete, as well as + 21,000 rubles for reinforcement, in total it turns out about 70,000 rubles.

The shallow depth of the foundation slabs in the garage makes it possible to ignore the heaving of the earth. So, the cost only for the arrangement of a slab-type base with a depth of 0.4 meters will amount to at least 64,000 rubles, which is much more than the price of the garage box itself made of foam blocks.

Performing calculations using a similar method for building a shallow version of the base with a tape laying depth of 0.5 meters will make the construction price about 18,000 rubles, a strip base 35,000 rubles, a shallow belt-pile with eight 150th type piles is estimated at 27,000 rubles.

Advantages of a shallow pile-strip base

The depth of the foundation for a garage made of foam blocks will directly depend on the budget, and it is clear that the described comparison of the price of manufacturing the base of the foundation for a walled garage just illustrates how much the strength and stiffness of a solid slab of concrete is overkill in front of tape variations. It makes sense to make a slab foundation if you have the opportunity to purchase simple reinforced concrete slabs at the residual value. In this case, the price of the foundation of walls made of foam blocks will cost at the level of the tape type option.

Taking into account the cost-stiffness ratio, a shallow piled base would be ideal. First, the use of the simplest TISE piles, which are cast to a depth of 2 meters, makes it possible to increase the degree of rigidity of a relatively thin strip more than 3 times. In this case, the parameters of pile-strip structures with a burial depth of 0.5 meters can be compared with a full-fledged strip-type base at a freezing depth. At the same time, the price of the strip scheme, even without taking into account the work on thermal insulation for the entire concrete depth, will be much higher than the foundation of the system using piles.

By comparison, installation of 12 reinforced concrete driven piles STs3-30 under the garage foundation will cost 65,000 rubles.At the same time, the rigidity and stability of such a foundation can be compared with the slab version, if the depth of freezing of the earth is not more than 1.2 meters.

The depth of the base and the threat of soil heaving

In addition to the price and rigidity of a certain foundation scheme, it is required to take into account the nature of the land on which the garage from foam blocks will be built ..

. For example, relatively shallow, prosperous tape bases are very sensitive to installation on weak swampy and peatlands. If the groundwater level turned out to be at a depth of 0.5 meters or more, it is categorically not recommended to use the MZLF or the tape version under the foam block walls.

How to determine the depth of the foundation for foam blocks In such conditions, the rigidity of the wall frame made of foam concrete is simply not enough, and the garage building after a while will receive cracks and subsidence in the walls .

.. Partially, the foundation problem can be solved by installing an effective drainage system and backfilling a rigid base with gravel and rubble cushion, with a thickness of at least 0.5 meters. If there are water sources on the surface on the site for a garage from a foam block, then it is best to abandon the foundation tape systems in favor of reinforced concrete piles with a reinforced grillage type.

Oddly enough, the main issue that most of the DIYers are guided by when choosing the depth of the base system is the level of resistance to soil heaving. According to the famous specialist Sazhina V.S., the heaving effect appears only on a certain type of land. These are mixtures of a fine-dispersed type of sand and clay, which can absorb a large volume of water.

At the same time, simple loams and clays are capable of not showing the effect of swelling if there was no water source. Skinny clays with a huge gravel content at low water levels are practically neutral in terms of swelling.


For a foam concrete garage, the issue of even very small deformations of the foundation base from lifting or swelling is extremely important, because the structural strength will directly depend on the tape deflections.

In this case, a large depth of laying the foundation tape, in addition to a serious increase in expenses for the arrangement, will not bring any tangible advantages. The situation will be saved only by insulation by means of MZLF and effective drainage at depth.

A layer of EPS and backfill of the perimeter of the outer perimeter of the base even at a depth of 0.5 meters provides excellent stability of the foam concrete walls. A real picture of the soil composition can be obtained only by taking a sampling of soil samples.

( 1 grade, average 5 of 5 )