We make the formwork for the foundation with our own hands. Making formwork for the foundation with your own hands. Disposable cardboard formwork

Having decided to build something, we ask ourselves the question, how to properly make formwork for the foundation with our own hands? After all, it is the foundation under wooden house will be the basis of the future structure. So, what types of formwork exist and how to choose the right and more suitable option for us.

Types of formwork structures

The main purpose of formwork is to give the future structure strength and its structural appearance. The tasks that formwork needs to cope with are quite simple:

• It must withstand the pressure of the concrete solution on its base.
• Do not change the given shape during the formation of the foundation for the log house.
• It is simple and affordable to erect, and be hermetically sealed from the ground (prevent leakage concrete mixture).

The material from which the formwork is constructed is different; it can be a reusable wooden or steel frame or a single-use structure that increases the overall durability of the foundation and, being its direct basis ( a shining example permanent formwork is a columnar foundation made of metal pipes).

This type formwork is advantageous due to its ease of installation and speed of construction, and after pouring concrete it remains an integral part of the foundation. For permanent formwork, improvised material is usually used, and depending on the type of foundation being built, it can be fiberboard, chipboard, metal frame or polystyrene foam. Another option is a columnar foundation made of pipes, in which pipes (asbestos, metal) with a diameter of 150-200 mm act as formwork.

An obvious advantage of such formwork is the ability to strengthen the foundation due to the material used (especially for columnar foundation and in case of using iron concrete slabs).

This formwork is easier to install and requires less earthworks(after all, you won’t have to remove it later). There will be no need for additional supports and spacers when assembling the formwork.

Types and features of the construction of permanent formwork:

Metal

The most expensive, but quite universal look is formwork made of steel sheets with a thickness of 1 to 2 mm. Pros:

• Such formwork easily accepts the required form foundation due to the ability to bend the steel sheet at the angle you need.
• Good foundation waterproofing.
• 3. For metal formwork monolithic foundation and there will be a tape ideal option(the reinforcement cage can be welded directly to the formwork).
• If the foundation protrudes strongly above the ground level, ease of processing outside.

The downside is cost and cost again.

Reinforced concrete

Relatively expensive option. Pros: depending on the thickness of the concrete slabs, it can significantly reduce concrete consumption without losing its strength.

Disadvantage: the weight of the slabs, and if the slabs are not monolithic and the height of one slab is not enough, then additional spacers will be required.

Figure No. 1

Expanded polystyrene

The bottom option is one of the most practical. The formwork is assembled from separate blocks (Fig. 1), which are clearly fixed to each other. Pros:

• Ease of installation
• Possibility to create the required shape (rounding, angle)
• Waterproofing and insulation

The disadvantages include the difficulty of selecting some elements (those very corners and curves) and not the lowest price.

Wooden

Figure No. 2

This can be either a board or sheets of plywood. Pros: price and availability of material, ease of installation and no need to purchase optional equipment for installation. Cons: Possibly due to various dimensions the material used will have to be used additional funds connecting and strengthening the formwork (Fig. 2).

From scrap materials

This can be slate, corrugated board, pipes (for a columnar foundation) or any suitable material that can provide the desired shape and prevent cement from leaking from the formwork. Pros: The main and probably the only advantage is the low cost of construction. Cons: Difficult to assemble, especially if different materials are used. Concrete leaks. Weak load-bearing capacity, it is unlikely that you will be able to build a sufficiently high and strong body for the formwork, and therefore you should limit yourself to only small buildings. Additional supports and wedges may also be needed.

How to make formwork for the foundation correctly? Permanent formwork is constructed with your own hands in the following several stages.

Stage one. Land works.

Having calculated (this stage will be written in detail below) required power future formwork, digging trenches (don't forget to take into account the thickness of the formwork). Tip: you can leave a margin of 1-2.5 cm between the formwork and the soil (this will simplify installation and after the formwork is split, this space will be filled with soil).

Figure No. 4

Next, the bottom of the trench is filled with crushed stone or sand (Figure 3) and compacted or applied concrete preparation(foundation screed). This is done to reduce concrete loss when pouring the foundation. If the foundation foundations are reinforced with reinforced rods, then they need to be driven into the ground at this stage.

Second phase. Construction of formwork elements

For permanent formwork, it comes down to adjusting its elements and erecting a structure in accordance with the selected material. At this stage, the reinforcement frame is formed (if provided).

Upon completion of all preparations, the formwork is poured with concrete and if your calculations turned out to be correct, then in 25-30 days you will be able to begin further construction.

Removable wooden formwork

Let's consider one of the available and practical types of formwork (Figure 4). Removable wooden formwork has a number of advantages and, although more modern materials, it is wood that most people give advantages to.

Reasons to choose it:

Although the cost of the material may be high at times, reuse formwork, as well as the ability to use the board, for example, for laying floors and constructing other wooden structures completely pay for it. In order to save money, such formwork can simply be rented and returned later.

• If for the construction of formwork it is used wood material of one type (only board, plywood, etc.) it is easy to fit (you can always saw off the excess).
• Ease of construction (all necessary tools you or your neighbors probably have). In fact, in the very simple version it can only be done using a hammer and saw.

Minuses:

• Difficulty in creating curves.
• At large quantities mortar being poured, the formwork will need to be reinforced with spacers.
• Difficulties may arise when giving the formwork a strictly vertical position (for example, if the board was not nailed quite evenly).

So, how to properly make formwork for the foundation with your own hands, without making mistakes and miscalculations.

After marking and preparing the construction site. They drive into the corners of the future formwork wooden blocks(the structure will be attached to them), so that during the construction of the formwork they remain on its outer side. Next, according to the measurements, wooden panels are prepared and gradually connected to the bars using screws or nails, thereby forming a frame.

If the volume of the solution being poured is large, then to strengthen the structure it is worth driving in additional spacers from the outside at a distance of 70-90 cm from each other. Another way is to tighten the walls of the formwork together with pins (but it is worth remembering that then after disassembling the structure there will be holes in it, which may limit its further use).

When installing, be sure to ensure that the formwork is in strict vertical position! Do not allow large gaps in the structure and, if necessary, seal them with improvised means (if the distances between the formwork segments are 4 mm or more, this means a leak of mortar in the future).

Advice: to ensure that the inside of the formwork is smooth, as well as to eliminate small leaks of mortar, you can use a stapler to nail construction oilcloth or cellophane to it.

Relatively the new kind formwork and is very versatile and easy to use.

Due to the short time of use and considerable price, it is still not widely used in private construction.

Advantages:

• The material retains heat well and does not allow moisture to pass through (you will not have damp corners)
• The ability to order any shape of blocks allows you to give free rein to your imagination when building the foundation.

Figure No. 5

Very easy assembly. The blocks are attached to the reinforcement (installed in the main components of the future building, Fig. 5) and the blocks are connected to each other by metal brackets (Fig. 6). Sometimes a connection with special foam is acceptable.

• With the help of such formwork, you can completely construct the entire building, gradually placing new ones on top of existing blocks and filling them with concrete
• Due to the design features, there are no concrete leaks, and the formwork is perfectly flat (with correct assembly Certainly).

Flaws:

This formwork is permanent and one person (due to the large investment of time and lack of experience) should limit himself to only pouring the foundation on its basis.

Surely this question torments many enthusiasts and experimenters - how to properly make formwork for a foundation with your own hands, giving it a round shape?

Basic preparatory work for the foundation will be the same as for other types of formwork, but the choice of material should be taken more seriously.

• Plastic

If the structure is not impressive, and you decide to build, for example, a gazebo, then plastic will do. It has sufficient flexibility and, if necessary, it can be bent with a little heat, but the strength of such formwork is low.

• Boards

Figure No. 7

Such formwork will be assembled according to the barrel principle (Figure 7) and, if necessary, can be reinforced on both sides with pegs driven in at a short distance from each other (10-20 cm). If this is permanent formwork, then it can be formed gradually - make a small part of the formwork and secure it with a small screed, and so on (tip: you can simply dig in the boards below the level of the “foundation cushion”, this will take longer, but will make the formwork more even). And after assembly, if there is a gap between the lower outer part of the formwork and the ground, fill it with gravel or sand. This type can withstand heavy loads.

• Plywood

Like plastic, it is a very weak type of material; besides, plywood cannot always be given the required shape.

• Expanded polystyrene

You can order the block parameters you need, this way you will save money and effort, but it will cost your wallet dearly.

• Metal

Steel sheets 1mm thick can also be used for such formwork. But without the help of additional tools, you alone will hardly be able to give it the desired shape.

Tip: you can search ready-made frames for removable round formwork and if you are lucky, then find the required diameter.

Strip foundation is still one of the most common methods of pouring the foundation for a future structure. The principle is quite simple: a screed is poured onto a sand cushion, after which a reinforcement frame is formed and filled with concrete mixture. But which formwork is preferable to choose for it?

Oddly enough, if the soil is strong enough and the foundation is recessed into the ground, you can do without formwork altogether, just dig a trench - of course, this is rare.

In other cases, any of the formwork methods presented above will do; it all depends on your imagination, available materials and available Money, and most importantly “the right hands”.

And yet, when constructing formwork, most people give preference wooden frame. Perhaps it’s a matter of price and ease of construction, each has its own advantages, but the fact remains a fact (probably for good reason). Perhaps this article will allow you to more accurately determine what you like.

Video:

Calculation of foundation formwork

Everything primarily depends on the chosen material.

So, let's give an example of a “classic” wooden formwork. The standard length for a purchased board is considered to be 6 meters, the width of the board is 100-150 mm, and the thickness is at least 25 mm. Now we divide the perimeter of the foundation by the length of the board (6), and divide the height by the width of the board (0.10-0.15), multiply the results obtained and find out the quantity necessary boards. For reference, on average, 1 cubic meter can contain from 42 (width 100mm) to 64 (at 150mm) boards. The price for 1 cubic meter is 5300-6500 rubles. To the price of the formwork itself, it is worth adding the cost of timber for fastening it and spacers for reinforcement, which can in various cases amount to an additional 3000-4000 rubles.

• Metal. It is calculated according to the same principle as wood based on the parameters of a sheet of 1*1500*2500 mm. Sold by weight at a price of 36,000-38,000 rubles/ton.
• Expanded polystyrene formwork should be calculated by a specialist based on the foundation plan. For complex units, the price will not be much lower than the metal price. And if the project is very intricate, then you may need the help of a professional during the installation process.
• Do not forget that there is a cost to add to any type of formwork. Supplies: nails and staples, reinforcement and spacers. Applications must also be taken into account additional tool, which may have to be purchased.

Advice: The most economical thing (contrary to popular belief and if the foundation design allows) is not to wonder how to properly make formwork for the foundation with your own hands, but simply rent it at the nearest construction site. This will save you time and effort and help you avoid some mistakes.

Features of choosing formwork

Before making the formwork for strip foundation, you need to evaluate the assortment building materials on the market for relevant goods. In addition, formwork can be rented; this may be the only right solution. If you are carrying out construction own home, then this option is not entirely suitable; it acts as an exception in the case when permanent formwork is purchased. If we consider everything possible options, making formwork is the most acceptable option. This suggests the possibility of using a material that will form the basis of the structure during further construction work.

Materials for the manufacture of formwork

If you are wondering how to make formwork for a strip foundation, then you need to decide what materials will be used in the process. A common option for this is plywood, among other things, but it is worth using the laminated version of this material, as it can withstand pouring more than once. If edged boards are used, then it is preferable to make panels.

Features of self-production of formwork

When assembling panels using edged boards, it is necessary to take into account that there should be no gaps between the elements; this is only the leakage of the solution.

You can use elements of different lengths and widths; when assembling, it is preferable to use nails, and in order to strengthen the panels and prevent them from diverging, cross members should be used. If you are thinking about how to make formwork for the foundation, step-by-step instruction, presented in the article, will allow you to carry out the work correctly. Shields need to be knocked down inside, and from the reverse the nails must be bent. Taking into account the dimensions of the future foundation, you can calculate the distance between the crossbars of the panels, this will eliminate deformation. Among other things, when making formwork you need to take into account the height future design. The higher the base, the thicker the formwork bars should be. This also applies to crossbars. At the next stage, you can begin assembling the panels; the quality of the foundation will depend on this work.

If you are seriously thinking about the question of how to properly make formwork for a strip foundation, then you need to consider that screws can also be used for fastening, which is the most common option. Highlighting the peculiarity of screws, we can say that their use involves insertion into wood; this fastening is considered the most successful for installing formwork. It is characterized by strength and reliability. The position of the formwork elements must be adjusted using a level and square. The verticality of the shields can be checked by simply building level, while the hydraulic level should be used to check the overall level of the structure.

Many craftsmen, before making formwork for a strip foundation, also think about how to carry out the dismantling work. These manipulations can be carried out very simply. In order to facilitate this work, the surfaces of the shields must be wrapped in paper, which must be pre-treated with oil.

Features of manufacturing removable formwork

Before making formwork for a strip foundation, it is worth considering that it can be permanent; in this case, you can use not only wood, but also aluminum and steel sheets, can be combined. Quite often, a polyvinyl chloride-based coating is used, which facilitates the process of installing and dismantling formwork. Steel formwork are usually used for the construction complex structures. At the same time, it is being built monolithic formwork. To make the process easier, you can use metal frames, into which wooden boards are inserted.

Requirements for the formation of formwork

If you are going to form the formwork for such a structure yourself, it is important to know, because otherwise you cannot avoid mistakes. When it is necessary to ensure as small a gap as possible between elements, removable formwork should have less adhesion to concrete. If during molding cracks of 1 to 5 mm were formed, then they must be removed using tow. If the resulting cracks have a more impressive width, then slats need to be driven into them. In order to tie the walls of the formwork, you can use wire rod.

If you are thinking about how to properly make formwork for the foundation, then you need to remember about the arrangement sand preparation, it must be formed so that the thickness is 150 mm.

Materials for using permanent formwork

If you will be making the formwork for the foundation yourself, you need to know how to make it yourself. If you decide to do permanent formwork, then you can use wood concrete or polystyrene foam. The first version of the material is made using the technology of mixing wooden raw materials in the form of chips and mortar. If you use this type of formwork, you will get walls that are already thermally insulated. This will allow you to get a design that is much cheaper brickwork, among other things, it will occupy less space. Expanded polystyrene, although considered suitable material for formwork, but is not entirely safe.

Features of the construction of permanent formwork

In order to carry out work using expanded polystyrene or wood concrete, the blocks must be connected using special locks that are provided on the products. The technology will be used the same as that used in the construction brick wall. Reinforcement will need to be inserted into special grooves, which will give additional rigidity to the structure, after which it will only be necessary to pour concrete. Such formwork is used, as a rule, in the construction of houses with a small number of floors.

A blind area must be built around any building, or rather along its perimeter. This coating protects the building from the destructive effects of melt and sediment waters, which can wash away the soil under the foundation of the house and lead to its subsidence, as well as destroy the foundation structures. This one is important protective element around the house is made of concrete or asphalt concrete. In order to complete the blind area, you need to build formwork. At first glance, this is not difficult to do, but there are some nuances that must be observed so that the blind area has the correct slope from the walls of the building. In our article we will tell you how to make formwork around the house.

Features and functions of the blind area

Externally, the blind area looks like an ordinary concrete or asphalt path, which is tightly adjacent to the walls of the building and encircles its perimeter. The width of this covering is standardized by SNiP and can be at least 1 m. It is worth remembering that the outer edge of the blind area should protrude beyond the boundaries of the roof overhang by at least 200-300 mm.

Important: installation of this protective coating is carried out after façade finishing work has been completed on the house.

The blind area performs several functions at once:

1. When snow melts or rain falls, precipitation can soak into the soil near the house and cause destruction foundation structures or basement flooding. Much more precipitation collects around the house, as it actively drains from the roof of the building and its walls.
2. Thanks to the blind area, the soil around the building does not freeze to such a great depth as in places open soil. Thanks to this, the basement or basement becomes warmer, which affects the temperature throughout the house.
3. In addition, frozen soil can also negatively impact foundation structures. This path near the building protects building construction from the forces of frost heaving, which can lead to movement of the foundation and cracking of the walls of the building.
4. The presence of a neat blind area around the house improves its aesthetic qualities.

To perform this coating you can use following materials:

• Concrete is most often used because it is the most available material, which you can prepare yourself. To pour concrete, you need to properly arrange the formwork. That is why in our article we will look at the intricacies of this process.
• You can also make a blind area from paving slabs.
• Around large public, multi-apartment residential buildings and shopping centers the blind area is made of asphalt.

Rules for formwork and blind areas

Before you get down to work and start making formwork near your house with your own hands, you should remember a few simple rules that will allow you to complete everything at the highest level:

1. If work will be carried out in hot weather, then the surface of the formwork and concrete (after pouring it) must be periodically moistened with water. Thanks to this, dried wood will not absorb moisture from the concrete, thereby reducing its strength. Wetting and covering concrete covering in the first few days after pouring will avoid too rapid and uneven evaporation of moisture, which can lead to cracking of the surface.
2. In order to correctly determine the width of the blind area, the slope, its depth and design, it is important to take into account the geological and climatic features construction areas. By following this rule, you will make a high-quality and durable blind area.
3. It is better to install this covering around the building before the onset of cold weather.
4. This protective concrete product should surround the entire house with a continuous strip. That is, there should be no gaps or areas of unprotected soil in the coating. Otherwise, through such uncoated gaps, water will easily seep into the ground and cause destruction of the foundation structures.
5. Between the blind area and base part At home, an expansion joint must be made, since these structural parts cannot be connected to each other. The width of the temperature gap is 2 cm. The seam must be sealed with sealant so that water does not leak into it.
6. When making formwork, you should ensure that there are no significant gaps in its structure through which uncured concrete mixture can flow.
7. The slope of the coating must be at least 10 ppm from the walls of the house, that is, 1 cm of slope per meter of width.

Necessary materials

For the manufacture of formwork you can use different materials, which are selected depending on the complexity of the design and its purpose:

• unedged or edged board;
• panel formwork can be made of particle boards (chipboards);
• Moisture-resistant plywood or oriented strand board (OSB) are also suitable for these purposes;
• some types of formwork that can withstand heavy loads are made of steel and aluminum alloys;
• permanent formwork is made of expanded polystyrene reinforced with fiber additives.

To form the blind area, unedged boards or plywood sawn in strips are suitable. Since poured concrete can slightly expand the formwork structures, as supports and load-bearing frame bars with a cross section of 30x30 are used, from which a durable structure is made.

Important: to make a protective coating around the house, removable formwork is usually used, which is dismantled after the concrete has hardened.

It is equally important to correctly determine the material for making the blind area. The covering can be made from compacted crushed stone, but in this case it is necessary to arrange a good drainage from the roof so that the flowing precipitation does not erode the fragile crushed stone covering.

A little better and more durable than crushed stone coverings will be a blind area made of cement mortar, laid on top of compacted crushed stone. This option provides better protection for the foundation of the house from destruction by melt and sediment waters. And it is this option for arranging the blind area that involves the implementation of formwork.

More expensive and quality option blind area devices - laying monolithic concrete slabs or reinforced slab products. But such materials cannot be used on heaving and clay soils, as well as at high groundwater level, since the structure can quickly deform.

In case of execution concrete blind area you will need the following tools and materials for work:

• crushed stone, sand and cement;
• polyurethane sealant for insulation expansion joints between the covering and the house;
• reinforcing mesh;
• nails, screws;
• roofing felt or plastic film;
• edged (unedged) boards or strips of plywood according to the height of the coating being poured;
• level, rule;
• spatula, bayonet shovel;
• container for mixing concrete.

Formwork technology

After you have decided on the material for making the blind area, calculated its width and the required slope, you can start working:

1. First of all, it is necessary to mark the future covering around the house. To do this, set the calculated distance away from the walls, hammer pegs in the corners and pull on a fishing line or cord.
2. After this, within the markings along the perimeter of the building, remove fertile layer soil 20 cm thick. The soil at the bottom of the resulting depression is carefully leveled and compacted.
3. Now we begin to assemble the formwork. First, a frame is made from timber. To do this, bars are fixed at the corners of the depression in the soil with a height slightly higher than the thickness of the coating being made. Next, along the stretched fishing line, the same bars are installed in increments of 50-100 cm. For greater rigidity, the bars are fastened together with longitudinal bars. Wooden elements connected using nails or self-tapping screws.
4. After this, we attach an unedged or edged board so that the beam is on the outside of the structure, that is, on the side of pouring concrete there is a solid Smooth surface boards We fasten the boards to the frame with nails.

Attention: to prevent concrete from leaking between the boards, the gaps between adjacent elements should not be more than 0.3 cm.

1. To prevent the formwork structure from bursting and deforming after pouring the concrete, oblique struts are attached to the frame from the outside. The installation step of such spacers is 50 cm. We attach the spacers to the frame bars using self-tapping screws or nails.
2. To make it easier to remove the formwork after pouring and hardening of concrete, its inner surface can be covered with thick plastic film or one layer of roofing material. This material will also perform other additional functions:
   • will not allow moisture from the concrete to be absorbed into the formwork boards, thereby reducing the strength of the concrete coating;
   • if there are significant gaps between the formwork boards (especially when using unedged boards) the coating will prevent concrete from flowing into the cracks.

1. Along the walls of the house it is necessary to install an edged board with a thickness of 2 cm and a height slightly higher than the height of the covering in this place. There is no need to firmly fix the board, since after the concrete hardens it will be removed. Using this board we will create the necessary temperature gap between the coating and the walls of the house.

Execution of coverage

After the formwork has been assembled, you can begin to make a concrete covering around the house. In this case, adhere to the following sequence of actions:

1. First, a sand cushion 10 cm high is made. The sand layer is leveled, moistened with water and compacted.
2. After this, a layer of crushed stone 10-15 cm high is made. It is also carefully compacted. At the same time, you should not forget about the necessary slope of the blind area from the walls of the building, so already at the stage of making the crushed stone cushion, you can take care of creating a slope.
3. A reinforcing mesh is laid on top of the crushed stone.
4. Now you can start pouring the concrete solution. You can use a factory mixture or prepare the composition yourself.

Important: in order for the coating to have sufficiently high strength and not crack over time, concrete must be poured at a time, without long breaks in work.

1. The solution being poured must be thick enough so that it can be laid in a thicker layer against the walls of the house, thereby creating the necessary slope. Correct filling is checked using a level. The surface is leveled according to the rule.
2. During the hardening process in the first days concrete surface moistened with water and covered with plastic film.
3. After removing the formwork and removing the boards that are laid along the walls of the house, the resulting temperature gap is filled with polyurethane sealant.

How to make formwork around a house with your own hands

Not a single construction site is complete without concreting, and where concrete mortar- there is formwork there. The design used in manufacturing deserves special attention. After all, the quality of the foundation for the house largely depends on its reliability.

Pouring formwork can cause the following problems:

• expansion during concreting;
• partial destruction;
• local leaks of concrete mixture.

To avoid this and find out what to make a structure from reliably and cheaply and what requirements are imposed on the materials, use practical experience experts from the FORUMHOUSE website.

What to make formwork from

The quality of the design largely depends on what material it is made from. The formwork for is made from: laminated plywood, OSB boards, DSP sheets, flat slate, non-removable polystyrene foam sheets. It's even in use old furniture, as well as “used” pallets.

But the undisputed leader is ordinary wood.

How to make a structure from boards

Forum members advise how to make formwork panels. To assemble horizontal panels, it is recommended to use edged boards measuring 100x25 mm and 150x30 mm, and for vertical panels, use timber 100x50 mm, resting him against the shield with his edge.

The vertical installation step is transverse (beam 50x100 mm) - from 70 to 100 cm. To make the formwork more rigid, two 50x100 mm beams are installed horizontally on each side, top and bottom.

With a well-thought-out design and competent execution, the strength of boards of these standard sizes is sufficient to withstand the pressure of large volumes of concrete mixture on the walls of the structure.

When choosing boards for this design, you must immediately consider the option of their further use. Because formwork for the foundation will require more than one cube; it is irrational to use boards only once. In order for the boards to remain “industrial wood” after dismantling, it is necessary to protect them from direct contact with concrete.

How to attach the film

Before concreting, the inside of the structure is lined with a durable polyethylene film for formwork that needs to be secured with a stapler. Construction is best done using self-tapping screws. In this case, it can be easily disassembled, minimizing damage to the formwork boards.

Dmitrievich-50 member of FORUMHOUSE

After dismantling the formwork, I put a 30x120 mm board on the sheathing. Before this, I cleaned the surface of the boards from staples. The main thing is to disassemble everything carefully.

UKSUS70 FORUMHOUSE member

The foundation is poured into pre-arranged formwork. This structure must be installed in compliance with the following established rules and normal. Familiarize yourself with the features of existing types of formwork, the procedure for their calculation, instructions for the construction of the most common structures and get to work.

Of course, before erecting the formwork, you need to decide on the type of foundation that you will build. We recommend reading the following materials on our portal:

- First of all, we suggest you familiarize yourself with step-by-step technology construction of a strip foundation. In which, among other things, it talks about the method of constructing wooden formwork.

Materials for the manufacture of formwork

Foundation formwork can be made from different materials.

Metal

Universal and most expensive formwork option. To assemble the structure, steel sheets with a thickness of 1-2 mm are used.

Metal formwork is perfect for arranging strip and monolithic foundation structures. it will be possible to weld directly to the formwork sheets, which will help increase the rigidity of the foundation.

The main advantage of the metal is the simplicity and convenience of its processing - the sheets can be bent to the required shape of the concrete base without any problems.

The main disadvantage of metal formwork is that it is very high price, when compared with other existing options.

Reinforced concrete

A relatively expensive type of formwork.

This formwork is constructed from concrete slabs. Depending on the thickness of the slabs used, when pouring the foundation it will be possible to slightly reduce the consumption of concrete mixture, which will save on the construction of the foundation without deteriorating the strength and other important characteristics designs.

Among the shortcomings it should be noted heavy weight slabs, which requires the involvement special equipment to install them.

Moreover, if the formwork is made from finished slabs and the dimensions of one element are not enough, you will have to install additional spacers, which is also not in the best possible way will be reflected in the final cost of the structure.

Expanded polystyrene

Very high quality and practical option. The formwork is assembled from ready-made individual polystyrene foam blocks. The formwork elements are extremely easy to install. They can be processed to the required shape without any problems.

The main disadvantages are difficulties at the stage of selecting certain structural elements (usually roundings and corners) and relatively high cost.

Available materials

During the process of arranging the formwork, make sure that its walls are installed exclusively vertically.

It is important that there are no large gaps in the structure. Seal gaps with suitable materials at hand. IN in this case A gap with a width of more than 4-5 mm is considered large - such a gap will be quite enough for concrete mortar to leak.

Additionally, to prevent minor leaks of the solution, you can attach it to inner surface formwork walls with polyethylene film.

It is recommended to dismantle removable formwork only after the foundation has reached the required strength. On average, this takes 3-5 weeks. The gaps left after dismantling the formwork are usually filled with soil. In some situations they are filled with concrete or cement

Good luck!

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Video - DIY foundation formwork