Pros and cons of a pile foundation for a house. Foundation on screw piles. Types of piles by area of application

Screw piles are a popular material for constructing foundations for small buildings. The speed of installation is one of the main factors in their popularization. It only takes one day to prepare the pile foundation:

the piles are screwed into the soil beyond the freezing level of the soil to a solid layer of soil;
after vertical installation, they are leveled and cut at the same level (so that the upper points form a single horizontal plane);
a head is welded from above to the cut site;
the installed elements are tied with a channel into a single structure.

To avoid corrosion on the inside of the pile, its cavity must be filled with concrete mortar. This completes the process. You can immediately begin the next stage of work.

Advantages of screw piles

Screw piles have many advantages. Undeniable advantages:

a wide range of applications (from use as a basis for various types of structures to use in construction for the construction of pile foundations);
environmental friendliness of the foundation made of screw piles and safety for the environment;
relatively low costs for;
Possibility of installation at any time of the year and in any geographical latitude;
service life is measured in several decades;
installation of screw piles does not require shrinkage, which means that operation can begin immediately after installation;
secondary use of piles is permissible if concreting was not carried out during the primary use;
there is no need for preparatory work to level the land plot, which means that harm to the landscape and plants on the site is excluded;
the possibility of strengthening piles by concreting during the operation of the facility, as well as extensions (extensions).

Such a list of advantages can captivate even the most demanding consumer. And if we are talking about the development of swampy soils and screes, then in this case screw piles are almost irreplaceable.

However, there is no ideal product that has no shortcomings. Screw piles also have disadvantages.

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Disadvantages of screw piles

The screw support has a metal base and is therefore susceptible to corrosion. Based on this, it is clear that “eternal” piles do not exist.

Sandblasting and anti-corrosion treatment with non-oxidizing materials before installation is a necessary condition.

While the screw pile is using an auger to rip up the entire thickness of the soil, the coating may suffer a little, but it will not be completely erased, so the pile will be protected. But the best guarantee of the durability of the pile is the quality of the metal. The support barrel must be made of new steel and be solid (without traces of welding). The blade should be perpendicular to the surface of the trunk. Piles can be solid cast or with welded auger blades. Cast products are more durable. If the blade is welded, then the welding must be reliable and of high quality.

The most vulnerable part of the pile is the auger as its thinnest part. At the same time, the load-bearing function of the pile directly depends on the diameter. Pile foundations are used, as a rule, to construct the foundations of small buildings - bathhouses, frame houses. That is, the load on the foundation will be relatively small. Metal corrosion is also a process that is not calculated in days or even months.

In many ways, the intensity of corrosion depends on the composition of the soil and the depth of groundwater. Provided that high-quality metal is used and natural conditions are unfavorable, the depletion of the auger will continue for at least 30 years. But even after this period for easy construction, the pile foundation will perfectly perform its functions, preventing subsidence.

Installing screw piles is not difficult, unless we are talking about rocky soils and hard rocks. They cannot be installed in rocky areas, in soils containing large quantities of large stones, or in soils with layers of limestone.

Problems may arise if the supports are not installed strictly vertically. But this problem is easily dealt with by specialists who thoroughly know the technology of installing pile supports and foundations. A problem that cannot be solved is the lack of a basement. A pile foundation eliminates the possibility of arranging a basement; you can only equip an underground floor, but such a space is unlikely to be warm. Using such a “room” is not very convenient, except perhaps for storing equipment.

The disadvantages of screw piles are in the minority, but the advantages have a huge advantage. So it’s worth trying to put it into practice, especially if the goal is to get the job done quickly and save money.

It so happened that the technology of bungalow construction was of great interest to domestic specialists. The idea of assembling supports from pillars, complemented by a screw blade and eyes, was very unexpected. Our developers, having assessed the pile-screw foundation and the pros and cons of cottages with a free foundation, decided to strengthen the basic elements and expand the calculation scheme. Changes are still occurring and make the technique quite expensive. The price with installation, arrangement of the blind area, and finishing of the base is especially striking. Although no less than the benefits that are promised:

availability of kits;
availability of detailed instructions;
ease of implementation.

However, in this case it would be more correct to start our research with the minuses.

Disadvantages that interfere with insulation

A pile-screw foundation requires the use of imitation timber

Some Russian contractors hide the fact that the pile-screw foundation technology was developed to speed up the construction of low-rise buildings. The weight limit for a pipe system (for a long period) is 9-10 tons. We are talking about options whose structure and technical characteristics are considered standard. The shrinkage of such models will be relatively high, even if the craftsmen take into account the pros and cons of the soil, climate, and time of year. Hence the prohibitions on:

use of thermal panels;
roof reinforcement;
the use of heavy materials (the classic screw foundation sags under brick structures and log houses).

The deformation is small, but wear still accelerates. The rods gradually crack and become slightly crumpled. The blades, thanks to which the installation is completed in 2-3 days, bend when screwed in. Rust penetrates into the pillar through damaged areas. That’s when former happy clients stop leaving rave reviews on forums and begin to nervously consult with old-timers. The latter know in practice the difficulties and costs of adjustments, as well as the sources of trouble. There will definitely be three or four experts who, when telling how to insulate a foundation on screw piles, will indicate specific reasons:

the trunks are metal, the cold easily penetrates through them;
the underground floor is open, the wind is blowing here;
moisture is retained in the base, dampness aggravates.

When a pile-screw foundation is discussed in the smoking rooms of Internet resources, different pros and cons are mentioned. Performers interested in increasing sales vividly describe the benefits; customers speak eloquently about negative properties. Everyone only agrees that after 25-30 years the pile-screw circuit becomes loose. The ceilings lose their support and warp a little. Over time, the screw foundation becomes mobile and crooked, the results of which are:

the appearance of cracks on the walls through which heat escapes;
roof displacement (icy moisture penetrates into the attic);
violation of the tightness of the floor.

Of course, similar shortcomings with the traditional approach also arise quite often. However, they are less noticeable, because extensions and trees help maintain the microclimate. These factors are not present here. It’s not for nothing that professional videos that explain how to install a screw foundation with your own hands are always filmed in large and clean areas. When a full installation of a pile-screw foundation is ordered, the price is determined taking into account the labor costs for demolition of services and uprooting of trees. It turns out to be a significant amount. Plus the cost of insulation. Well, there are points due to which the price can be reduced.

Insulation-facilitating benefits

In the technology used to create a screw foundation, environmental friendliness equalizes the pros and cons. The initial stage consists only of digging marking holes. Therefore, for those who apply for a pile-screw foundation, the prices of preparatory measures seem modest. When screwing in the blades, the integrity of the soil is slightly compromised. And it is known that installing a circuit without much impact on the ground provides three advantageous points. This:

stabilization of the water-thermal state of the conditional subfloor;
maintaining relatively high soil temperatures;
good susceptibility of the subgrade to insulation.

When considering the pros and cons of a house on stilts, they remember first of all that a pile-screw foundation is favorable for large-scale plans

The components of a pile-screw system are connected by welding. It is possible to buy a welding machine on shares; it is not difficult to operate. And service centers meekly compromise: the price lists of most companies include both the price with installation and the cost of just a set of piles. The possibility of self-installation compensates for the disadvantages associated with openness and unaesthetic appearance. By saving on the services of craftsmen, it is easier to allocate decent funds to solve the problem of how to insulate a pile-screw foundation and maintain its functionality.

A pile-screw foundation allows you to fantasize about insulation

Fewer complications mean wider prospects for strengthening, which makes the screw-based structure truly comfortable. Reviews from homeowners and reports from craftsmen allow us to judge it competently. On forums, screw foundations are praised and criticized, clearly explaining the pros and cons of various projects. Be sure to emphasize what is allowed here:

backfill with sand, black soil, pebbles, expanded clay;
cover the bottom of the structure with a geomembrane or polyethylene film;
fill the space with CBPB, fill it with bricks, foam blocks;
Fill the base with bitumen and liquid rubber.

Against the backdrop of versatility, variable prices look even more attractive. Moreover, even the price varies with installation, which is difficult to adjust. Iron poles cost less than steel ones. Purchasing cast rods does not hurt your pocket as much as buying welded rods. The numbers vary, the technical specifications differ slightly. Screwing in by hand, on which the simplified technology of a pile-screw foundation is based, does not cost much, but takes up precious time. Mechanical screwing guarantees speedy installation, but forces you to fork out more money.

Each approach has its pros and cons, which independent testers have long identified. The peculiarity of the situation: all the shortcomings and advantages can hardly be called pure. If the standards would allow the installation of brick and timber cottages on a screw foundation, the price with installation would rise to the skies, and there would be absolutely not enough money for insulation. Now the budget will be distributed relatively evenly without any problems. If the piles became eternal, capable of staying in the ground forever without human intervention, homeowners would save on major repairs. Dangerous trend. Environmental friendliness is always ambiguous. On the one hand, it ensures safety for health, on the other hand, it reduces the reliability of the structure.

Pile-screw foundations have long been used by the military for the construction of various structures.

However, now they have begun to be actively used in civil engineering, although the pros and cons of pile-screw foundations are still actively discussed by specialists and amateur builders.

The load-bearing element of a pile-screw foundation is a screw pile. It is a steel pipe with a pointed tip and a screw blade welded onto it.

The tip may be cast or molded from the body of the pipe. The tip with the blade - the screw - transfers the load from the above-ground part of the structure to the ground and at the same time plays the role of supporting the pile.

In addition, the screw tip prevents the pile from being squeezed out of the ground when it freezes. This function is especially important when constructing lightweight structures (for example, wooden) in water-saturated clay areas.

From the above we can conclude that the screw tip is the most critical part of the pile, therefore all the pros and cons of a screw foundation depend on its characteristics.

Advantages of pile-screw foundations

The main advantages of pile-screw foundations are:

installation speed: you can install piles under a medium-sized house in just one day;
undemanding to the topography of the construction site: even on hilly terrain it is possible to build a screw foundation without excavation work, and therefore without disturbing the landscape. The height difference of the site is compensated by correctly selected pile lengths;
possibility of construction on any type of soil;
ease of installation of piles: in most cases they can be screwed into the ground manually using a special key;
low cost: a pile-screw foundation is 70% cheaper than a strip foundation;
independence of construction work from the time of year: screw piles are perfectly screwed into the ground at any degree of freezing;
the possibility of starting construction of the above-ground part of the building immediately after installing the foundation.

Reducing the volume of auxiliary work is also important: during the installation of a pile-screw foundation, no construction waste is generated.

Disadvantages of pile-screw foundations

You can build a house on screw piles if you have evidence of their good quality (certificates, passports, factory test reports, etc.).

The disadvantage of a pile-screw foundation is the susceptibility of the metal to electrochemical corrosion.

If there is a railway within a radius of 50 meters from the house, an electrical substation or cellular communication facilities, the service life of the pile will be reduced due to the increased level of stray currents in the soil (if it is water-saturated).

A house built on screw piles does not have a basement, which can also be attributed to the disadvantages of this type of foundation. You can surround the piles around the perimeter with brickwork, but in winter such a room is unlikely to be warm.

Calculation

The purpose of calculating a pile-screw foundation is to determine the minimum number of screw piles

Step 1: Determine the total load on the foundation

The total load includes:

building weight: it is defined as the sum of the weights of all building materials that make up the walls, roof and other parts of the building;
payload arising during the operation of the premises. According to SNiP 2.01.07-85*, for every square meter of a residential building there is 150 kg of payload. For office premises this parameter is 200 kg/sq. m;
snow load: for the III snow region of the Russian Federation it is taken as 180 kg per square meter of roof surface.

The resulting amount increases by 1.1 - 1.2 (safety factor).

Step 2: determining the load-bearing characteristics of the soil

This parameter determines the maximum possible load of the screw pile. To calculate it, geological research data is required.

Private developers often do not have such documents on hand; in this case, you can use the value of the minimum permissible load on the pile, which is indicated by manufacturers in the accompanying documentation.

The table shows approximate values of the permissible load on the pile and recommendations for use depending on the diameter of its shaft:

Note: the table shows the average permissible load of piles. This parameter depends on the steel grade, wall thickness and some other features of the product’s production.

Step 3: Determining the minimum number of piles

The minimum number of piles is determined using a simple arithmetic operation: the total load is divided by the minimum permissible load of the selected pile.

The resulting value is adjusted based on the requirement: the distance between the piles should be 1.5 - 3 meters.

Lifetime

Almost all manufacturers of screw piles promise high durability of their products - up to 150 years. One could agree with this if the metal were in ideal conditions. But given the many factors that contribute to an increase in the rate of corrosion development, one can argue with this statement.

If we take into account that the pipe is subject to corrosion from the inside and outside, the results of the analysis are disappointing: the service life of a pile-screw foundation is only 30 years (if the metal does not have a protective coating).

The life of piles can be extended to approximately 100 years if the pipe is coated inside and outside with bitumen and hot or cold galvanizing is used.

But these measures will only help on slightly corrosive soils. In addition, after several decades (60 or 70) inside the metal, destruction processes may begin that are invisible from the outside.

The most realistic estimate of the service life of screw foundations is 40-70 years.

Video about the pros and cons of a pile-screw foundation

Foundations on screw piles are increasingly used for the construction of residential private houses and buildings for various purposes. The use of supports that are immersed in the ground by rotation allows you to reduce the time required to construct foundations. But screw piles cannot be called a universal solution - this type of foundation has a number of disadvantages and limitations in application.

Design Features

A screw pile consists of a steel pipe and a blade welded to its lower end - by design, it is a drill that can be effectively screwed into the ground. The screw tip, equipped with a blade, is the key element of the pile.

During installation, it acts as a mechanism responsible for driving the pile, and then serves as a support, transferring loads from the constructed structure to the ground. At the same time, the blades turn the pile into a kind of anchor, preventing it from moving upward under the influence of soil movements during frost heaving.

This is primarily relevant when constructing small wooden buildings on alumina soils with a high level of water saturation. A reinforced concrete foundation, even laid below the freezing level, will be pushed upward by frost heaving - the impact in this case is tangential to the structure from the side. A lightweight structure does not have enough mass to balance the impact.

The extension of the steel pile support (blade) in its lower part is located below the freezing level and is reliably adhered to the ground. The forces of frost heaving acting on the body of the pile itself cannot push it upward. In this case, the steel pipe does not deform, since under the tangential influence of frost heaving the load is no more than 0.2 MPa, and the tensile strength of steel is from 330 MPa.

Scope of application

The main area of use of screw piles is the arrangement of economical foundations for commercial buildings and private wooden houses, and the construction of enclosing structures.

Product markings indicate the standard size of screw piles. The first number is the diameter of the barrel in millimeters, the second is the diameter of the screw blade. When choosing a standard size, the operating loads on the foundation are taken into account:

diameter 76 mm - for light enclosing structures;
diameter 89 mm - for verandas, canopies, gazebos, brick pillars;
diameter 108 mm – light houses made of timber, logs, frame buildings;
diameter 133 mm - heavy houses made of logs, buildings made of foam concrete and aerated concrete blocks.

A screw pile is a load-bearing element of the foundation; its main functional part is a screw (tip with a blade). The operational properties of the foundation depend on its parameters. Manufacturers offer two types of screw piles: with a welded or cast tip.

Welding tip

Support elements with a welded tip are cheap products of low quality, especially if they are made by hand. A drill blade is welded to the bottom of a steel pipe with a pointed end. If the blade is positioned incorrectly, such a pile cannot be immersed vertically in the ground - it will “move” to the side.

Another problem with welded tips is the low quality of welding and the metal itself from which the blade is made. The blades of such products are easily deformed and even come off if, during the immersion process, the support encounters stones in the ground. The separation of the blade can be felt during installation work - the pipe will turn too easily.

If, due to poor quality welding and anti-corrosion treatment, the seam collapses several years after the foundation has been laid, the pile will lose support. This threatens uneven subsidence of the foundation under loads, destruction of the grillage, and then the wall structures. The building quickly falls into disrepair.

Critical reviews of screw pile foundations are primarily based on the experience of constructing underground foundations using low-quality support elements with a welded screw tip.

Inexpensive products of this type are suitable for the construction of temporary lightweight buildings, various types of fences and canopies. For house construction, using supports with a welded blade is risky.

Cast tip

Cast screws for piles are manufactured only in production conditions, which makes it possible to monitor the quality of the products. In this case, the technology of precision casting in a vacuum is used; the manufacturing material is high-strength steel ST-35, ST-25. Finished products undergo heat treatment to increase strength characteristics.

Solid tips compared to welded ones are characterized by:

accuracy of geometric parameters;
higher blade thickness (13 mm versus 5 mm for welded ones, if we compare the thickness of the base of a blade with a diameter of 300 mm);
immersion in the ground without deformation from small stones and construction debris.

A solid tip is inserted into the lower part of the pipe and welded around the circumference. This design has a high load-bearing capacity and can be used for the construction of heavy log houses (provided the diameter of the pile is correctly selected).

The cost of a support element with a cast tip is approximately 25% higher than the cost of welded products. If for construction you choose piles made of steel pipes with high-quality galvanization and an external anti-corrosion polymer coating, the foundation supports can last for about a hundred years.

The cast tip itself does not require anti-corrosion treatment - the protective layer on the working part is rubbed off on the ground during the screwing process. The thickness and quality of the blade are sufficient to ensure that the corrosion process does not affect the reliability and durability of the structure.

Please note: products with molded tips should be selected very carefully. Violation of production technology leads to a decrease in the quality of products and their reliability - for example, to reduce costs, finished tips are not heat treated or low-quality metal is used. Such casting is fragile and the tip is not able to perform its functions. You can also find casting fakes on the market.

It is recommended to purchase screw piles with cast tips directly from a reliable manufacturer, checking the product certificates. To ensure the reliability of the foundation, installation work is carried out using specialized equipment and in the process the torque of twisting the supporting elements is controlled. If the installation of the piles was carried out on your own, after completion of the installation work, a pressure test is carried out for each element.

Piles from tubing

A separate category includes welded screw piles made from tubing. For their manufacture, a thick-walled pipe (6.5-7.5 mm) made of corrosion-resistant steel is used. The welded blade is made of high-strength structural steel.

The cost of constructing a foundation using screw supports from tubing is close to that of constructing foundations on reinforced concrete. However, a significant advantage is the ability to perform foundation work in a short time, including on difficult soils.

Types of foundations

Using screw supports, you can construct several types of foundations:

pile tape (supports are located under the future walls and fastened with a grillage - horizontal beams made of wood, metal or reinforced concrete);
standard option - the support is screwed under each column or load-bearing element of the frame;
pile field - the supports are located with the same spacing over the entire area of the future foundation;
single elements - supports are used to support individual parts of the building (terrace, porch with canopy, etc.).

Pile-screw foundation: pros and cons

The advantages of using screw piles include:

quick and inexpensive installation - installation of support elements can be completed in one day;
immersion of elements into the ground without the use of special equipment, if the properties of the soil allow;
minimal amount of excavation work - there is practically no need to remove soil under the supports;
possibility of construction on most soils (with the exception of rocky and swampy);
carrying out work at any time of the year - supporting elements are screwed even into frozen soil;
reduction of construction time - the grillage is installed immediately after installing the supports, and if it is not made of monolithic concrete, you can immediately begin building walls;
a minimum amount of auxiliary work related to the removal of excess soil and garbage collection;
savings - the cost of a pile-screw foundation is 60-70% lower than a strip foundation;
Possibility of use during construction on difficult terrain - there is no need to level the site, construction can be carried out on a slope using piles of various lengths.

Disadvantages of a pile-screw foundation:

the metal is subject to electrochemical corrosion and deteriorates over time;
the rate of destruction increases several times if stray currents spread in the soil due to increased saturation of water and nearby electrical facilities (electrical substation, railway, cellular antenna, etc.);
during installation, the support may become deformed and the blade may come off;
a screw foundation does not make it possible to build a house with a basement;
serious measures are required to insulate the floor.

Conclusion

The main part of the disadvantages of foundations of this type is associated with low quality or incorrect choice of screw piles. High-quality supporting elements, selected taking into account the loads and characteristics of the soil, can last for decades, as evidenced by foreign experience.

If you plan to build a residential building, you should not skimp on the quality of screw piles for the foundation - these should be supports with a cast tip, a thick layer of galvanization of the pipe itself and a reliable polymer outer coating.

The basis of any house is the foundation. Depending on the type of soil, the wishes of the customer and the size of the future building, the foundation can be made using different technologies. The settlement of the future house, the possibility of flooding in the spring and the service life of the walls without cracks depend on the quality of the foundation.

Types of foundations

1. Tape. Most often used in Used for houses with a relatively large mass, for example, stone ones. Such a base can be a prefabricated or monolithic structure. The latter is created using formwork into which concrete is poured. The prefabricated foundation consists of blocks.

2. Monolithic. It is more durable than tape. It is a reinforced concrete slab located under the entire house. selected for buildings located on soil prone to subsidence. Such a foundation will protect the house from cracks and ensure the reliability of the structure under any conditions.

3. Columnar. Consists of which act as point supports. From above, all parts of the foundation are connected by a strapping beam. Separately standing pillars cannot provide sufficient stability to the building, so only one-story wooden houses can be built on such a foundation.

4. Pile. It is used for the construction of multi-story buildings. A pile foundation for a house is suitable for all types of soil. We need to talk about it in more detail. It differs from others in the absence of preparatory excavation work, that is, for its construction there is no need to dig a foundation pit. Depending on the type of soil, piles 4-6 meters long are selected. Before you make a pile foundation for your house, you need to decide on the type of supports to be used.

Types of piles used for foundations

1. Drivers. With their help, the foundation is provided with the greatest stability. When designing a building, architects calculate the total weight of the building and divide it between each pile. While driving it into the ground, it is subjected to the load that it must withstand. The completion of the pile’s deepening means that it has reached the soil layer on which the future building can stand.

It is additionally achieved by the fact that the earth around the hammered reinforced concrete tubular or square element is compacted. The pile is gradually driven into the ground using a special pneumatic hammer. It is impossible to do this on your own. Therefore, the construction of a pile foundation of this type cannot be recommended for independent construction, for example, on a summer cottage.

2. Screw. Such piles are steel pipes, at the ends of which threaded elements are welded on the outside. In appearance and operating principle, such piles can be compared to huge self-tapping screws that are screwed into the ground. Thanks to the screw thread, the support area of the pipes increases, which helps to keep them even more securely in the ground. If the soil has low bearing capacity, then pipes with threads along the entire length are used.

Such a pile foundation, the pros and cons of which will be discussed below, is suitable for independent construction. Drilling screw piles into the ground can be done using special equipment or manually. The last method requires two or more strong people. For connection with the screwing technique, two holes are located on the pile head. When digging into the ground, it is important to control the vertical position of the pipe. After reaching the required level, concrete is poured into the pipe cavity.

The disadvantages of a pile-screw foundation are the need to accurately calculate the depth of the building support. Here the type of soil, the mass of snow and the depth of its freezing in winter must be taken into account.

Reliable screw piles must be of high quality; otherwise, the threads may come off or become damaged during deepening. The result of this will be the loss of bearing capacity by the foundation element. Screw steel piles are protected from corrosion by a layer of factory paint.

3. Bored. To install this type of piles, preliminary creation of a well is required. When developing it in dense soil that does not crumble, the formwork does not need to be installed. In this case, you only need to set a limit for the head. Concrete is poured directly into the well. Working with loose soils requires casing a well with pipes.

Piles are installed in the corners of the future house, along the external and internal walls. The number of supports and the distance between them depends on the weight of the building. The well can be created using special manual mechanisms. The disadvantage of bored piles is the impossibility of determining the moment of reaching a solid layer of soil.

The best option in terms of speed of creation and price is considered to be a screw pile foundation. The pros and cons of its design require detailed analysis.

Advantages of a pile-screw foundation

High installation speed;

Ease of installation;

The ventilated base prevents the floor from rotting;

Construction of the foundation is possible even in the cold season;

Affordable price.

Disadvantages of a pile-screw foundation

Insufficient coating with a protective layer of paint provokes the formation of corrosion;

Impossibility of deepening piles into soil containing large stones;

Difficulty installing the foundation close to other buildings;

The cost of building a warm basement is comparable in cost to the foundation itself.

Combining piles with a grillage

It is advisable to combine free-standing piles with a grillage into a single structure. This will help it resist the forces of frost heaving of the soil.

A pile foundation, the disadvantages of which can be considered insignificant, requires preliminary calculations and preparatory work.

Preliminary calculations for the construction of a pile-screw foundation

Before purchasing all-metal hollow pipes, you need to decide on their number and diameter. Each pile can withstand loads of up to 6 tons. Their number is determined based on the material of the future building. For a wooden house, it is enough to install piles every 2.0-2.5 m. When using heavier materials, they will need to be deepened at a distance of 1.5-2.0 m.

The length of piles for low-rise construction usually does not exceed 3.5 m. In some regions this figure may be higher. The diameter of the products is usually 57-133 mm. After calculating the required number of piles and their length, you can purchase all materials.

Preparatory work before installation of a pile-screw foundation

Difficult terrain, marshy or peaty soil will not require a large amount of excavation work in order to build a pile foundation. The pros and cons of this are obvious. Eliminating the need to dig a pit significantly reduces the time needed to construct a foundation. But without testing the soil, it is difficult to determine the depth of freezing and the type of soil. When contacting special companies, all these indicators can be found out for a specific area.

Construction sequence

A pile foundation, the pros and cons of which are already known, is not difficult to install yourself. To do this you need:

Mark the site;

Screw the piles manually or using machinery;

Cut or tighten the supports to the required level;

Fill the pipe cavity with concrete;

Mount the grillage from the required material.

Thus, a brief description of the sequence gives an understanding of how to make a pile foundation yourself. Construction companies can obtain calculations of ready-made buildings with this type of foundation.

Pile foundations, reviews of which are mostly positive, are not common in Russia. Today the situation is gradually changing, and more and more owners are choosing it for their country houses.