Just leave a request and get a 7% discount

Send

Best price on a foundation made of FBS!

Prefabricated foundation made of FBS blocks for a cottage - prices

Strip foundations are widely used in individual construction. Their attractiveness is explained by a combination of simplicity of technology, a relatively small amount of work (including excavation), low cost of materials and the ability to do without the use of heavy construction equipment. But for all their availability, strip foundations are able to withstand the weight of a brick, stone or monolithic building and, subject to proper waterproofing, are distinguished by perhaps the highest durability among foundations for low-rise buildings.

The cost of building a prefabricated foundation from FBS - turnkey

Tape dimensions, m	Section dimensions
	width height	width height	width height	width height	width height
	30cm/60cm	30cm/90cm	30cm/120cm	40cm/150cm	40cm/180cm
6m x 6m	112,000 rub.	126,000 rub.	200,000 rub.	260,000 rub.	RUB 309,000
6m x 8m	124,000 rub.	143,000 rub.	RUB 224,000	RUB 282,000	330,000 rub.
8m x 8m	133,000 rub.	164,000 rub.	RUB 242,000	RUB 325,000	388,000 rub.
8m x 10m	154,000 rub.	170,000 rub.	RUB 274,000	RUB 348,000	426,000 rub.
10m x 10m	173,000 rub.	198,000 rub.	RUB 305,000	RUB 397,000	474,000 rub.
10m x 12m	183,000 rub.	RUB 214,000	RUB 335,000	440,000 rub.	RUB 507,000
12m x 12m	198,000 rub.	RUB 234,000	RUB 358,000	473,000 rub.	562,000 rub.

*Prices include materials.

What is FBS

FBS - foundation wall blocks. These are ready reinforced concrete structures, produced in a certain range of standard sizes and intended for the construction of foundations and walls (mainly basements and ground floors) of buildings and structures for various purposes. The following types of blocks are distinguished:

Monolithic FBS;
FBS with holes (penetrations) for communications;
U-shaped hollow FBS;
Pillow blocks in the shape of a trapezoid, laid under the base of the foundation.

The height of all FBS blocks is 60 (58) cm. Their length ranges from 80 (78) to 240 (238) cm, and their width can be 30, 40, 50 or 60 cm. FBS have a standard marking XX.Y.6, where XX is the length in decimeters, Y is the width of the block, and 6 is the standard height of the block in decimeters, that is, 60 centimeters. FBS is made from M100 concrete reinforced with steel reinforcing bars.

Pros and cons of strip foundations made of FBS

Unlike a monolithic strip foundation, the construction of a FBS foundation takes much less time. It does not require a long period (about 25-28 days) for setting and final hardening of concrete. The block base is assembled in 2-3 days, after which you can proceed to the construction of the walls of the cottage. If you choose a prefabricated foundation made of FBS, there is no need to purchase reinforcement, install formwork, or hire a mixer to transport the concrete solution.

Of course, the blocks themselves also cost money, but taking into account the vagaries of the weather, the time gain of almost a month provides significant savings in money - with a ready-made foundation, you feel much freer in terms of carrying out further construction and finishing work. This smoothly leads to early completion of construction, prompt transition to finishing work and, ultimately, a finished house in one season, followed by moving before the onset of cold weather.

Now about the disadvantages: it is clear that a prefabricated foundation requires the presence of joints - vertical and horizontal - between the blocks. That is why FBS blocks cannot be used as structural elements of the foundation if, according to the building design, it has a ground floor or basements. Even with the best quality primary waterproofing, over time moisture will begin to seep through the joints, making basement unsuitable for use and living in the cottage is uncomfortable due to high humidity.

The process of installing a prefabricated strip foundation

The process of constructing a prefabricated strip foundation from FBS for a house or cottage begins with marking the site and sampling the fertile soil layer over the entire area of the house. After this, the marked trench is deepened according to the design documentation. Gradually, in two or three steps, a sand cushion 15-20 cm thick is poured onto the bottom of the trench. Each layer is compacted and spilled with water. A layer of crushed stone of similar thickness is poured on top of the sand, compacted, and leveled. Next, trapezoidal blocks should be installed (if the soils are not heaving, it is permissible to install FBS with a gap of no more than 70 cm, provided that the joints of the blocks do not fall on the gap sites.

As an option, instead of trapezoidal blocks, it is possible to pour a monolithic base tape for the installation of FBS. The tape with a height of 30 to 50 cm must be wider than the foundation blocks; its reinforcement with a rod with a diameter of at least 12 mm (the frame is knitted with wire with a diameter of 0.6 mm) is mandatory. Ideally, the tape is poured into the prepared formwork, but practice shows that with non-flowing soil, it is enough to line the sides of the trench with roofing felt to avoid seepage of concrete slurry and, as a result, deterioration in the performance characteristics of the foundation. It takes 10-14 days for the tape to set and harden - during this time the concrete structure gains 70% of its strength.

Specifics of laying FBS

Laying the blocks begins from the corners of the outer walls of the house. There are grooves in the end parts of each block, and they must be tightly driven in with a solution that will subsequently set and ensure a reliable connection of the blocks to each other. After the corners, the outer walls are laid out, then the inner ones. It rarely happens that the entire perimeter and partitions can be laid out in whole blocks. As a rule, some fragment is missing. Cutting a finished block is a difficult and very labor-intensive task, so it is much easier to fill the missing area with concrete in the form of a monolithic reinforced insert.

Starting from the second row, FBS is laid on the solution (thickness about 1.5 cm). At the joints ( vertical seams) make a dressing of 25-60cm, the specific size of which depends on the hardness of the soil. The higher it is, the smaller the dressing can be. If dressing cannot be performed, then it is replaced with pieces of reinforcement with a diameter of 8-10 mm or masonry mesh. When laying blocks, you should remember about the technological holes at the points of entry and exit of utility systems - in particular, sewerage and water supply.

A prefabricated strip foundation made of FBS requires reliable waterproofing. In order to extend the service life, the base is sometimes insulated. Specialists of the Cottage-Expert company will develop a foundation project, calculate its parameters and select the optimal option for materials. You can order a strip foundation for a house in Moscow and the Moscow region from us. A guarantee is provided for the work performed.

Built country house By frame technology plus a small veranda. The cost turned out to be quite economical, and the time frame was 3 and a half months. We even finished it a couple of weeks earlier than promised. We only go to the dacha in the summer, so I can’t say anything about thermal insulation. Thank you

Thank you very much for building a house made of aerated concrete. The quality of both the material and work is excellent - FRIENDS WILL BE JEALOUS. Time frame for completed work: a house was built from scratch in approximately 4.5 months. Good luck to all of you, good clients and big houses!!

They built our house in 3 months (they started the foundation at the end of summer, and finished the walls and interior decoration in the fall), it wasn’t cheap, but everything was thought out, our participation was minimal. This year we are building a bathhouse together with them! Thank you for such professional guys that you provided us with!

Thank you so much for your work and attitude! Everything is efficient, high quality, fast! Thanks to the team led by Alexey!

The company built me a great summer house! I don’t have any complaints about the company; next summer I’m going to build a bathhouse and a garage. I’ll definitely contact them. Thanks to everyone, especially Sergei’s team, who built it for me, a lot depends on them!

We built a house from aerated concrete in your company - I’m very pleased. The house was erected on our pre-prepared foundation in 45 days. And as a gift we received home insurance for a year. So I recommend it.

In August 2017, I ordered a foundation (monolithic slab) for a house in the Leningrad region. In 2018 I already ordered the house itself. I can recommend it because... We were pleased with the result. Everything was done quickly and professionally.

We ordered a house and garage from this company in the summer of 2016. The builders worked for about 4 months, without a break (they really liked it). Everything was done according to the agreement, no extra money was asked.

Frequently asked questions before construction

About company

How long has your company been in business?

Our company began work as a repair and finishing company in 2007. From that moment on, we have grown into the construction industry and all thanks to our employees. Special thanks for the work invested in the development of the company.

How is the competence of specialists confirmed?

All architects and engineers of the company have qualification certificates. Because the project is not subject to a company license, but to an architect’s certificate. By law, responsibility for the project lies with the architect.

Does your company do all the work? Or do you use contractors?

We ourselves carry out general construction, Finishing work, site arrangement, wiring of engineering systems (electricity, heating throughout the house, water supply) and so on.
We invite contractors to work that we do not perform every day and require specialization, for example: production and installation of windows and doors (special orders), air conditioning systems, boiler room equipment, installation of wells, septic tanks.
Searching, attracting, complying with agreements and monitoring the performance of work by contractors is our task.
We carry out 80% of all work on the construction of your home ourselves and only 20% involve contractors.
We enter into an agreement with each contractor in which he specifies a guarantee for the work performed by him, and in case of malfunctions, their elimination is the responsibility of the contractor.

Is it possible to see objects that are currently in operation?

Yes, there are objects that we can show at different stages of work and houses that have already been commissioned by prior arrangement.

about the project

Should I buy a standard project or order an individual one?

Buy finished project.

Plus is the price.
The downside is that it will not include all your wishes regarding materials and layouts. Also, it will require modification to suit the characteristics of your site.

Buy a ready-made project and modify it.

It all depends on the changes you want to make. It is possible that developing an individual project will be more profitable for you than modifying a standard one.

The cost of such modifications must be discussed during the meeting.

Development of an individual house project.

Pros: all your wishes regarding all characteristics of the house and site are taken into account.
The downside is that the cost of such a project is higher than a standard one.

BUT! You can develop an individual project for free. If our company builds, then the development of an individual project is free for you.

How is an individual project developed?

The development of an individual project begins with the signing of a contract and the first meeting with the architects, at which the client voices his wishes. Based on the results of the meeting, a design assignment is drawn up, which is an annex to the contract.
Architects prepare several versions of sketches and decide with the client in which direction to move next. During the entire design period, several meetings take place with the client, at which all architectural and design solutions are worked out in detail until the client is satisfied with everything, which he confirms with a signature on the Draft Design.
Next, a working draft is developed. This is the calculation phase of each design solution in which the client is not involved.
This entire process takes from 2 weeks to 2 months, after which the client receives a finished project with ready-made detailed calculations, which is necessary when submitting documents for a building permit.

About construction

Will you go to the site where construction is planned?

Yes. When inspecting the site, we take into account the size, access from the road and its width, the proximity of neighboring buildings, the presence of a slope or drop, cardinal directions and what kind of soil is on the site.

Do you help with choosing a site for construction?

Yes. Our specialists help with site selection. They will help you find it according to your requirements on the Internet with advertisements.

What influences the final price of a home?

The cost of building a house is affected by:

site features: relief, entry conditions, location
materials used in construction
house architecture features
work conditions (working time restrictions)

What guarantees do you provide?

We provide a 3-year guarantee on our work. The manufacturer provides a guarantee for materials and it is different in each case. There are materials for which the manufacturer provides a lifetime warranty.

How can I control construction?

We send each client a step-by-step photo report of the work.
We install online video surveillance of the facility 24 hours a day, you and the company’s specialists have access to it (paid service).
You can also use the services of companies that provide technical control.
The construction is carried out in stages, you always see which stage and only after accepting one, we proceed to the next.

When is the contract signed?

The design contract is signed at the meeting, before the first communication with the architect.
The construction contract is signed after the estimate has been developed and approved.

When should I pay for your work?

For design, an advance payment is required within 5 days after signing the contract in the amount of 70% of the total amount. The balance is paid upon delivery of the finished project to the client.

Payment for construction is broken down according to the stages specified in the estimate. Each stage of construction is also divided into payments, the size of which may vary (usually due to the need to purchase materials)

How are builders placed?

It will be convenient if you have the opportunity to place construction workers near the construction site; a garden house, a construction trailer, an old house or any other building with a roof.
If there is nothing like that, then we are ready to bring our change house for FREE.
In extreme cases, we will accommodate our builders in a nearby hostel

What communications are needed to start construction: electricity, water?

Electricity with a power of at least 5 kW and technical water.

If this is not the case, then we will bring our generators FREE OF CHARGE. In most cases, water wood construction used only for household needs, we will provide its delivery on our own.

What time of year do you carry out construction?

We build all year round, one of important conditions in the spring-autumn period this is a suitable road for vehicle access.

WHAT CAN WE DO FOR YOU?
	We will help you save by correctly calculating the estimate and choosing high-quality materials.
	Complete high-quality design documentation, thanks to which you can not worry about the design decisions made.

We work throughout the Moscow region

Volokolamsky district, Voskresensky district, Dmitrovsky district, Egoryevsky district, Zaraisky district, Istra district, Kashirsky district, Klinsky district, Kolomna district, Krasnogorsky district, Leninsky district, Lotoshinsky district, Lukhovitsky district, Lyuberetsky district, Mozhaisk district, Mytishchi district, Naro-Fominsk district, Noginsk district, Odintsovo district, Ozersky district n, Orekhovo-Zuevsky district, Pavlovo-Posadsky district, Podolsky district, Pushkinsky district, Ramensky district, Ruza district, Sergiev Posadsky district, Serebryano-Prudsky district, Serpukhovsky district, Solnechnogorsky district, Stupinsky district, Taldomsky district, Chekhovsky district, Shatursky district, Shakhovsky district, Shchelkovsky district.

Choosing a foundation for building a house with a basement is 30% of construction costs. To reduce costs, a foundation made of FBS blocks, which ensures a long wear resistance life, would be relevant. To build a structure yourself, you need to rent special equipment, draw up a house project and dig a pit. Foundation blocks are an industrial technology that, if the sequence of measures is followed, can be successfully used in suburban, private and country construction.

What are FBS blocks?

The FBS foundation is made in the form of a reinforced concrete pad and block vertical walls. A foundation made independently from strong foundation blocks eliminates reinforcement, because concrete has the ability to compress.

Reinforced blocks - FBS concrete structures from which the foundation is made - have a number of advantages for owners of private or suburban plots.

The advantages of construction activities include:

ease of installation work;
high strength and frost resistance characteristics that the base will ultimately receive;
low cost compared to the reliability of the base;
selection of product parameters according to the configuration of the house or the depth of the fundamental structure.

The economic benefit of building a foundation from FBS blocks is manifested in the absence of costs and time for the construction of formwork or a frame made of reinforcement. The foundation can be created in any weather, and, moreover, there is no need to wait until the concrete dough gains strength.

Design types of products

The foundation, made of concrete foundation blocks, is made as a strip or has a columnar structure. The strip building can withstand the weight of a high-rise building or a one-story house. The dimensions of the wall material are determined by the thickness of the ground wall, the type of soil, and the number of storeys of the building.

Columnar laying of foundation blocks is justified only on dense soils. If construction is carried out on marshy soils, support slabs or piles are used.

Standard sizes of FBS products

FBS foundation is one of the types of blocks, the technical regulations for the production of which are specified in GOST 13579-78. The regulatory document considers materials, design characteristics and rules for transporting products. Solid blocks of increased strength are made from a concrete-based mixture with a density of 1.8 t/m3.

To build a block foundation, elements of several standard sizes are used:

width from 30 to 60 cm in increments of 10 cm;
length 9, 12 and 24 dm;
30 or 60 cm high.

FBS type blocks from which the foundation is made are fixed with a mounting loop or bent. A good storage option is to be placed on a wooden platform 3 cm thick. Laying a foundation from FBS blocks with your own hands

Algorithm of installation activities

Step-by-step instructions for installing concrete block elements consist of performing the following technological steps:

Site analysis (detection of soil type, level of freezing, groundwater level).
Excavation work (marking the territory, digging a pit).
Organization of the pillow.
Consecutive laying of blocks under a certain type of foundation.
Performing waterproofing.
Arrangement of thermal insulation.
Backfilling of the base.

The correct foundation, made from FBS type blocks, implies not only the correct algorithm for how to lay concrete blocks. The measures require careful planning of the height of the walls, taking into account the existing basement floor and the depth of soil freezing.

Conducting terrain analysis

Taking into account the type of soil and groundwater level makes sense if a prefabricated strip concrete foundation running along the lines of the house needs to be organized on the site - the construction of FBS type blocks involves digging a trench.

To make a structure correctly, it is important to calculate its support. The elements are located 30 cm below the soil freezing level, which eliminates cracking of the material during frost heaving. If there is a basement, the depth of the structure is planned to be 20-30 cm below the floor surface.

Making a foundation from shallow-type FBS blocks is justified for light buildings made of wood, aerated concrete, polystyrene concrete, and SIP panels. The depth of the structure is determined by the type of soil. When working on dense soils, it is better to follow the standard placement of elements - 2.5 m. Monoliths without deepening are constructed only by construction specialists, since as a result of ignorance of the technology, the building can warp. Installation of FBS blocks using a crane to build the foundation

Carrying out excavation work

The foundation for a house made of concrete blocks provides for the correct marking of the territory. The site planning is carried out according to the design documentation and consists of two stages.

Marking the area for the pit

Professional guidance from specialists presents a clear markup algorithm:

Driving in stakes. They are located at a distance of 50–100 cm from the corners of the structure to prevent soil shedding.

Stretching the cord. It is placed according to the external walls, provides for the presence of a plinth and the width of the block.

Additional activities. If the building has a bay window or an entrance, then a prefabricated or strip type foundation created from FBS type blocks is marked with chalk or primer.

After all tasks are completed, the final result is checked against the project and adjusted.

Digging a pit

Excavation work is carried out taking into account existing communications, groundwater and soil. When the installation of the foundation is carried out in the basement, it involves laying slabs, and on the site there is weak soil, a foundation pit at a depth of 40 cm is justified. It is better to deepen the trench tape by 30 - 70 cm.

Digging a pit is done as follows:

The top layer of soil is removed to the selected depth.

For a deep pit, a barrier is installed.

Vertical surfaces are leveled and waterproofing is laid.

On loose soils, the walls are marked at an angle; when cutting through the aquifer, the trench expands and 3-5 ledges are made, depending on the type of soil.

The verticality of the walls is periodically monitored.

Further tasks include laying geotextiles and forming a bed based on gravel and sand.

What are the additional requirements for digging a hole? Carrying out work in the dry season to prevent soil erosion.

Pillow organization

The foundation for a block house, depending on the soil, is laid on reinforced concrete slabs, sand, gravel mixture or crushed stone with medium fractions.

Reinforced concrete option

You can make a heavy strip foundation, working with elements made of concrete blocks, by laying reinforced concrete products as a cushion. Activities are subject to the following algorithm:

Laying a sand base with a thickness of 0.3 - 0.5 (based on the type of soil).

Medium or coarse sand is selected for the substrate, since it shrinks less and the foundation for a house made of blocks does not deform.

Features of sand-based pillows

A sand cushion is useful to create a prefabricated foundation made of blocks. The substrate is characterized by ease of implementation and low cost. A prefabricated strong foundation made of FBS concrete blocks will distribute the load of the building onto the ground.

Application of sand and gravel cushion

The structure, made from a mixture of gravel and medium-sized sand, is distinguished by good load-bearing capacity and ease of implementation. In comparison with a sand foundation, the laid frame - a strong strip foundation, massive of dense concrete blocks - will have a high cost. The advantage of using sand and gravel is the good density of the materials - they can withstand the weight of a high-rise building.

Pouring a concrete pad

Option suitable for buildings with increased load. Step-by-step instructions for reinforcing and pouring concrete dough:

The formwork is being installed. Use the materials you used to decorate your site - plywood, OSB, boards with waterproofing.

A reinforcing frame is made based on a mesh belt and profile rods with vertical jumpers.

The concrete mixture is poured in one go.

The composition is laid along the upper side of the formwork frame. Foundation made of FBS blocks - advantages and structural characteristics of the base

Block laying technology

The construction of a FBS foundation requires preliminary preparation of drawings. Simple scheme will allow you to understand how to lay the first row of blocks on the foundation, and after that the next one. Bandaging must be performed with a displacement of the elements by 25 cm.

Nuances that are important to consider

An algorithm developed by specialists will tell you how to make a foundation out of blocks.

According to the rules:

the optimal length of products should be 2.4 m - this reduces the number of seams;
coupling with reinforced concrete pads by filling voids with concrete mixture is required;
installation of ventilation ducts with a total area of 0.004 units of the basement space.

In case of weak soil, the first ridge is reinforced with a monolithic reinforced concrete belt.

Technological sequence of laying

For the rigidity of the main structure, a foundation placed on prefabricated blocks laid by hand is relevant. The measures are carried out taking into account the location of the corners on the same line, the presence of elements near the communication holes and the tightness of all products.

Correctly making a foundation from FBS blocks means following a step-by-step methodology:

When placing a foundation made of durable FBS blocks on the ground, learn how to properly lay blocks on concrete dough. Work in a similar way to brickwork.

Performing a T-shaped dressing with an overlap in? element height (dense soils) and full height (soils subject to compression).

Filling the solution only with a shovel and then leveling it.

Filling vertical seams after making a row of blocks with your own hands.

Verticality control with beacons (deviation angle of 2-3 degrees is allowed).

Formation of technological openings, slightly larger than those indicated in the project for quick fastening of anchors or bricks.

The last row of the structure is widened by installing 40 cm elements on 60 cm blocks - this increases the spatial rigidity of the house. The foundation from FBS blocks is the basis of construction

Final stage of events

When planning how to properly build a foundation on strong blocks, working with your own hands, do not forget about waterproofing and backfilling measures. Manipulations are carried out on any soil and include the following:

Waterproofing. The made block layer is treated with roofing material, bitumen, and liquid rubber backfill. The constructed monolith dries for several days, after which it is covered with sand with fine fractions and compacted.

The final manipulations consist of organizing drainage and blind areas.

A foundation made of concrete blocks is a structure that, if you become familiar with the algorithm in detail, will not be costly in terms of time and money.

When calculating the cost of construction work, the cost of erecting foundations is a quarter of all costs of constructing a building. Each individual developer would not mind saving significant money on this part of the construction work, while maintaining a balance between price and quality, and in the case of foundations, also strength and reliability. For a technical and economic comparison, we can consider the cost of constructing popular types of foundation structures: monolithic concrete and prefabricated from FBS blocks.

Monolithic and prefabricated foundations: comparative characteristics

To make a comparison and draw a conclusion - which foundation is cheaper: monolithic or prefabricated from FSB blocks, you need to understand their structure and installation.

Monolithic concrete and prefabricated load-bearing structures can have two types of designs: strip and column. There are many differences in the construction of these types of foundation structures:

	Monolithic made of concrete	Prefabricated from FBS blocks
Preparatory stage: excavation work		Required to be completed in full
Financial costs for purchasing or renting removable formwork	Required in full	Not needed
Labor costs for installation and dismantling of formwork	Required, but can be reduced when using permanent formwork structures	Not needed
Time and season of work	Significant, including the period of strengthening concrete mixture and warm season	Minimum

Block structures are recommended for use for the device buried foundations.

Ready-made FBS significantly speeds up the laying of the underground part of the house, and therefore prefabricated foundations are cheaper than other types.

Comparison of monolithic and block foundations

In the comparison table you can see the main differences in the design and installation of foundations:

The volume of excavation work for the installation of both types of load-bearing structures is approximately the same, with a slight advantage for a monolithic structure, which will require a little more space during reinforcement and installation of the formwork system.
The price of precast reinforced concrete and ready-mixed concrete for a monolithic concrete mass is almost the same.
Foundation blocks are laid on a layer of cement-sand mortar using a truck crane.
Monolithic tape requires significantly more costs for the purchase of materials for formwork and reinforcement, the manufacture of reinforcement cages and their installation, the production of concrete (for small volumes) or purchase with delivery by a concrete truck - a mixer of ready-mixed concrete and laying the concrete mixture into the tape structure. Here we also need to add labor costs for compacting the concrete mixture by vibration and caring for the concrete for 3 to 7 days until it gains 70% strength.
The cost of replacing a truck crane for unloading and installing a prefabricated block structure is about 12,000 rubles. The installation of FBS can be completed in a few days by a team of workers - installers in the amount of 3 people. If you carry out the simplest calculations, you can draw the following conclusions: the total cost of renting a truck crane, wages for installers and purchasing cement mortar will be two or three times cheaper than performing similar works during the construction of a monolithic load-bearing structure.

Based on the listed conditions for the work and economic feasibility, we can make an unambiguous conclusion that a strip foundation made of FBS blocks will be better in all respects than a monolithic one .

Savings when installing a block structure

There are several additional opportunities to reduce the cost of constructing block structures. For example:

When installing, use used blocks in good condition, the price of which will be several times lower than new ones.
The possibility of constructing a block foundation in winter, when installation work Big seasonal discounts are offered.
When constructing a prefabricated foundation, a combination of both FBS blocks and small-sized stones (cinder block or brick).

Such simple measures can significantly reduce the cost of constructing a prefabricated load-bearing foundation for a house.

Features of choice

Despite the comparative price indicators, one cannot be so clear about the choice: FBS or monolith. There are times when it is better to opt for a more expensive foundation design and at the same time ensure maximum reliability and strength of the entire structure.

It is known that any monolithic structure will be stronger than a prefabricated one made from individual fragments. This truth applies perfectly to foundation arrays. The reinforced concrete block itself is a single monolith, but a structure assembled from individual foundation blocks will not be completely intact and monolithic. This must be taken into account when choosing the type of supporting base.

If the building site has a soil foundation with possible horizontal displacement, the prefabricated foundation may end up in an extremely unstable position, which can lead to loss of integrity of the foundation mass.

If the soils on the site have unstable surface layers or the site is located on steep terrain or hills, it is better to give preference to a monolithic concrete foundation.

Construction of strip foundations on difficult terrain:

Criteria for choosing the type of foundation

The desire to save money when constructing load-bearing elements of the foundation is not always the main criterion for choosing a particular structure. There are basic situations for the construction of load-bearing structures:

When constructing one-story brick, slag concrete, stone buildings or multi-story buildings with foam concrete walls, it is allowed to construct buried foundations from FBS blocks. More massive houses and structures are recommended to be installed on a monolithic solid foundation.
If the foundation has a shallow structure, it is better to make it from monolithic concrete using a reinforcing metal frame. FBS blocks can be used in stable, strong soils.
The combined technology of creating a foundation with a combination of laying FBS blocks and pouring a reinforcing monolithic concrete belt, which will simultaneously serve as the base of the building, has proven itself well.

You can make a foundation strip using any of the following methods. It is necessary to carefully weigh all the nuances of constructing foundation structures in each specific situation.

Arguments for choosing a monolithic strip foundation

There are times when there is no point in making a choice: a structure made of FBS or a monolith. There are conditions under which it is necessary to perform a monolithic concrete foundation in the form of a continuous tape:

If the site has heaving soil foundations.
There is a risk of increased seismicity in the construction area.
Significant loads on the foundation, as a result of which the structure will be subject to bending moments.

Considering all these factors, we can conclude that the savings should be reasonable. The main thing for the foundation is strength, stability and reliability of the entire structure and ensuring the integrity of the entire structure.

It is difficult to say unequivocally which type of load-bearing base will be cheaper: monolith or FBS. To make an accurate comparison, it is recommended to link construction to the individual conditions of the site, the nature of the terrain and soil types.

To build any house, you need to lay the foundation. There are high-quality and relatively inexpensive ways to lay the foundation under a house. The fastest and most accessible foundation is considered to be a foundation made of FBS blocks.

Although, from the point of view of many builders, monolithic foundation considered ideal, it has its limitations. In particular, to gain strength, concrete in a monolithic structure must be left for at least 4 weeks. And the foundation for a house made from ready-made elements does not require long-term maintenance and that’s all construction works can be laid in one spring-autumn season.

Many people wonder whether it is possible to make a foundation from FBS blocks with your own hands? Yes, of course, if it is a small, lightweight building or house. For example, a bathhouse or a summer kitchen. For this purpose, there are lightweight types of block concrete elements.

This article presents step-by-step instruction: how to properly do the preparatory work and carry out the entire construction of the foundation of the house.

Advantages of a foundation made of FBS blocks:

During construction, there is no need to construct formwork and reinforce the foundation;
Building with prefabricated concrete elements saves a lot of time. This is due to the fact that there is no need to wait until the foundation gains strength. This means that you can immediately move on to the next stages of building a house;
There is no need to prepare large quantities of concrete;
There is no need to call a concrete mixing truck.
The construction of a foundation from FBS blocks can be carried out in wet weather. Rain and snow are not scary for him;
Of the large construction equipment, only the services of a construction crane are required to install concrete elements.

Attention! A foundation made of concrete blocks can be erected in areas where the soil is dense and dry. Even with a small heaving of the soil, the foundation will begin to deform and its solidity will be disrupted.

Selection of foundation blocks

FBS are produced by vibrocompression at factories, according to quality standards for reinforced concrete products (GOST 13015 and GOST 13579-78). For their production, high-strength grades of concrete are used (B 22.5, B7.5, etc.), and increased strength is provided by reinforcement with steel class BP-I, A-III or A-1.

The heavy type of concrete has high strength and load-bearing characteristics. Increased water-repellent parameters for silicate species. Also, for specific needs, various fillers for concrete are used, expanding the possibilities of its use in construction.

For regions with severe temperature conditions, blocks are produced in which special frost-resistant additives are introduced into the concrete composition. Thanks to this, such a foundation made of FBS blocks will withstand an extended temperature range.

For construction light foundation It is advisable to lay concrete elements with a porous expanded clay filling, which will also provide additional thermal insulation.

If construction is carried out on acidic soil, then manufacturers suggest laying a foundation of FBS blocks with crushed granite stone embedded in concrete. This ensures greater resistance of the structure to acidic environments.

The blocks differ in their dimensions and cross-sectional shape: T-shaped or trapezoidal. Main standard sizes of FBS:

Width from 30 to 80 cm;
Height from 30 to 60 cm;
Length from 60 to 240 cm.

The reinforced concrete pads laid in the first row of the base of the FBS foundation itself (see video) have a trapezoidal shape with a wide base. These are so-called concrete pads, or slabs.

The rectangular blocks have grooves at the ends, which are filled with mortar during construction, creating so-called concrete locks, which provide additional strength to the structure.

How to decipher the alphanumeric markings of FBS blocks

For example, FBS 24.3.6-P means:

Three numbers separated by a dot (sometimes there is a hyphen): the first number indicates the length, the second number the width, the third the height of the product;
The last letter indicates the type of concrete (C – silicate, T – heavy, P – porous).

Advice! Make a preliminary layout of structural elements in a computer program, taking into account displacements during installation. Once you know the required sizes and quantities, you can order FBS from the seller. Brief step-by-step installation instructions are described in our video at the end of the article.

Attention! In places where communications will be connected to the house, special elements with holes are installed.

Marking and preparing the pit

Before you start building a foundation from blocks, you need to properly conduct geological research to determine the depth of the zero cycle and determine the depth of soil freezing.

The next step is to prepare the site. Remove the top fertile layer of soil. The surface is leveled and communications are connected to the future foundation. If necessary, drainage for the future drainage system is made in advance.
On the prepared area, you need to make markings for the building using a theodolite or pegs, string and a level.
Next we proceed to earthworks. A pit is dug in the form of several trenches, repeating the location of the load-bearing walls of the building, according to the plan. If a large building is being constructed, it is advisable to hire an excavator.

Important! The width of the trenches is made such that blocks can be freely placed in them and waterproofed. The size of the blocks themselves is selected depending on the mass and number of storeys of the future house, according to the load capacity.

Laying the base of the FBS foundation

Then a layer of crushed stone of fraction 20-40 is poured to a height of 15-20 cm and thoroughly compacted.
It is necessary to ensure that the bedding under the blocks is level horizontally.
Next, using a crane, the foundation pads are lowered onto the prepared bedding.

Advice! If during construction a concrete pad is not made, and the blocks are laid directly on the sand, then it is necessary to use a masonry mesh.

Installation of FBS blocks

Foundation blocks are installed on the foundation pads, placing them as close to each other as possible. The structural elements are laid by analogy with brickwork - in a staggered manner, starting from the corners of the building onto the concrete mortar.

Advice! If you plan to build a massive building, then when laying blocks it is advisable to use a metal mesh to strengthen the structure. This is especially recommended in regions with increased seismic activity.

During the installation process, the blocks are installed in a trench and tied together with reinforcement. The cavities between the blocks are filled with binder cement mortar. The viscosity of the solution should be such that it gets into all the voids of the blocks.

Important! When laying, it is always necessary to use a level to avoid curvature of the structure.

Manufacturing of reinforcing belt

First, the formwork is made. The reinforcement in the belt is laid either in the form of a single-layer mesh or in the form of a spatial frame. In this case, the choice of reinforcement depends on the thickness of the belt. Then the solution is poured.

For your information! The belt can be made of brick, on which the floor slabs will then be laid.

Waterproofing foundation from FBS

After installing the blocks, all masonry joints must be opened and filled with a special mixture with a waterproofing additive. A good mastic is suitable for this purpose. It is convenient because you don’t need to heat or wrap anything. And in particularly wet areas or with frequent precipitation, waterproofing work is carried out on the outside.

Then the trench is filled in. And the block foundation is ready!

Advice! To solve problems with drainage, you can use the old-fashioned method: pour a layer of clay into the trench and compact it thoroughly.

The foundation for the house is made of FBS. Foundation made of FBS blocks: technology for constructing a durable prefabricated foundation. Prices for mastics