Do I need an armored belt for a cinder block garage. How to pour a reinforced belt? Reinforcement of the concrete belt

Remove from wooden barrel steel hoops and it will fall apart. Clean up at home reinforced belt And the building won't last long. This is a simplified, but very clear explanation of the need to strengthen the walls. Anyone who is going to build a solid house will benefit from information about the purpose, types and arrangement of armored belts.

What is this design and what functions does it perform? Armopoyas - a tape made of monolithic reinforced concrete, which is laid on several levels of a building under construction.

The reinforced belt is poured in the foundation, under the floor slabs and under the mauerlats (rafter support beams).

This amplification method performs four important functions:

• Increases the spatial rigidity of the building.
• Protects the foundation and walls from cracks caused by uneven settlement and frost heaving of the soil.
• Does not allow heavy floor slabs to push through fragile gas and foam concrete.
• Reliably connects the roof truss system with walls made of lightweight blocks.

The main material for increasing the rigidity of the walls was and remains reinforced concrete. For small outbuildings, you can use a less powerful brick armored belt. It consists of 4-5 rows of brickwork, the width of which is equal to the width of the bearing wall. In the seam of each row, a grid with a cell of 30-40 mm made of steel wire with a diameter of 4-5 mm is laid on the solution.

Strengthening the walls with a reinforced belt is not always required. Therefore, there is no need to waste money on its device in the following cases:

• under the sole of the foundation lies a solid soil (rocky, coarse or coarse sand, not saturated with water);
• the walls are built of brick;
• under construction cottage, which overlaps wooden beams rather than reinforced concrete panels.

If on the site lie soft soils(pulverized sand, loam, clay, loess, peat bog), then the answer to the question of whether a reinforcing belt is needed is obvious. You can not do without it in the case when the walls are built from expanded clay concrete or cellular blocks (foam or aerated concrete).

These are fragile materials. They do not withstand ground movements and point loads from interfloor floor slabs. The armored belt eliminates the risk of wall deformation and evenly distributes the load from the plates to the blocks.

For wood concrete blocks (the wall thickness is not less than 30 cm, and the strength grade is not lower than B2.5), the armored belt is not needed.

For Mauerlat

The wooden beam on which the rafters rest is called the Mauerlat. She cannot push through the foam block, so it may seem to someone that an armored belt is not needed under her. However, the correct answer to this question depends on the material from which the house is built. Mauerlat fastening without armored belt is allowed for brick walls. They securely hold the anchors with which the Mauerlat is attached to them.

If we are dealing with light blocks, then the armored belt will have to be poured. In aerated concrete, foam concrete and expanded clay blocks, anchor fasteners cannot be securely fixed. Therefore very strong wind can tear off the power plate from the wall along with the roof.

For foundation

Here the approach to the amplification problem does not change. If the foundation will be assembled from FBS blocks, then the armored belt is definitely necessary. Moreover, it must be done at two levels: at the level of the sole (base) of the foundation and at its upper cut. This solution will protect the structure from intense loads that occur during the rise and settlement of the soil.

For reinforced concrete strip foundations, reinforcement with a reinforced belt is also required, at least at the level of the sole. Rubble concrete is an economical, but not resistant to soil movement material, so it needs reinforcement. But the monolithic “tape” does not need an armored belt, since its basis is a steel three-dimensional frame.

There is no need for a device of this design and for continuous foundation slab, which is poured under buildings on soft soils.

For what types floors do you need an armor belt?

Beneath the panels that lean on expanded clay concrete blocks, gas or foam concrete, reinforced belt must be done in without fail.

Under a monolithic reinforced concrete floor, it can not be poured, since it evenly transfers the load to the walls and firmly binds them into a single spatial structure.

Armor belt under wooden floor, which relies on light blocks (aerated concrete, expanded clay, foam concrete) is not required. In this case, under the beams, it will be enough to fill in the support pads of concrete 4-6 cm thick to eliminate the risk of punching blocks.

How to make an armored belt?

The technology for constructing a reinforced stiffening belt is no different from the method of pouring a monolithic foundation.

In general, it consists of three operations:

• Manufacturing reinforcing cage;
• Formwork installation;
• Pouring concrete.

Certain subtleties and nuances in the work appear depending on the location of the armored belt.

Reinforced belt under the foundation

Answering the question of how to make a reinforced belt under the foundation (level 1), let's say that its width should be 30-40 cm more than the width of the supporting part of the main concrete "tape". This will significantly reduce the pressure of the building on the ground. Depending on the number of storeys of the house, the thickness of such a stiffening belt can be from 40 to 50 cm.

The reinforced belt of the first level is made under all the load-bearing walls of the building, and not just under the outer ones. The frame for it is made by knitting reinforcing clamps. Welding is used only for preliminary connection (tack) of the main reinforcement into a common spatial structure.

Armoias of the second level (on the foundation)

This design is essentially a continuation strip foundation(rubber concrete, block). To reinforce it, it is enough to use 4 rods with a diameter of 14-18 mm, connecting them with clamps with a diameter of 6-8 mm.

If the main foundation is rubble concrete, then there are no problems with installing formwork under the armored belt. To do this, you need to leave in it free place(20-30 cm) for the installation of a reinforcing cage, taking into account the protective layer of concrete (3-4 cm).

With FBS blocks, the situation is more complicated, since formwork is not placed for them. In this case, wooden spacers should be used, which support the formwork panels from below. Before installation on the shields, trimmings of boards are stuffed, which protrude beyond the dimensions of the formwork by 20-30 cm and do not allow the structure to move to the right or left. To connect the formwork panels, short cross bars are nailed along the top of the boards.

Option for fastening the formwork of the armored belt on the foundation blocks

You can simplify the mounting system by using threaded studs. They are placed in pairs in formwork panels at a distance of 50-60 cm. By tightening the studs with nuts, we get a sufficiently strong and stable structure for pouring concrete without wooden supports and crossbars.

This system is also suitable for formwork, which requires an armored belt for floor slabs.

Studs that will be filled with concrete should be wrapped in glassine or a little machine oil should be applied to them. This will make it easier to remove them from the concrete after it has hardened.

Armopoyas for floor slabs

Ideally, its width should be equal to the width of the wall. This can be done in the case when the facade will be completely lined with slab insulation. If for decoration it is decided to use only plaster mortar, then the width of the armored belt will have to be reduced by 4-5 centimeters in order to leave room for foam or mineral wool. Otherwise, a through cold bridge of very solid dimensions will appear in the zone of laying the stiffening belt.

When making an armored belt on aerated concrete, you can use another solution. It consists in installing two thin blocks along the edges of the masonry. A steel frame is placed in the space between them and concrete is poured. The blocks act as formwork and insulate the belt.

If thickness aerated concrete wall 40 cm, then for this purpose you can use partition blocks 10 cm thick.

With a smaller wall thickness, you can cut out a cavity for an armored belt in a standard masonry block with your own hands or buy a ready-made aerated concrete U-block.

Reinforced belt under Mauerlat

The main feature that distinguishes the armo-belt under the Mauerlat from other types of reinforcement is the presence of anchor studs in it. With their help, the beam is firmly fixed to the wall without the risk of tearing or shifting under the action of wind loads.

The width and height of the reinforcing cage must be such that, after the structure is monolithic, at least 3-4 cm of the concrete protective layer remains on all sides between the metal and the outer surface of the belt.

The need to create an armored belt under the Mauerlat during the construction of the roof is not always obvious to novice builders. They often create a misconception about the reinforced strengthening of the foundation for the construction of the roof as something unnecessary and superfluous. However, the armored belt is an important intermediary that distributes the load of the roof on the walls of the building. Consider why an armored belt is needed under the roof, what functions it performs and how to do it yourself.

In this article

The need for an armored belt

Let's start the consideration of the reinforced base under the roof with its main functions.

Load conversion

The rafter legs transfer the load to the Mauerlat, the main concentration of which is in the places where the rafters rest on the walls of the house. The task of the Mauerlat and armored belt is to transform this load, making it uniform. Mauerlat is affected by two types of loads. This is the weight of the roof itself, the snow accumulated on it, the impact of wind gusts on the roof and other natural phenomena.

Another load is associated with the bursting of the walls of the building by the rafters. With an increase in the weight of the roof, it increases significantly. Modern materials for the construction of buildings, such as expanded clay concrete, aerated concrete, with a number of positive characteristics unable to withstand such a bursting load. Before mounting a Mauerlat on them, it is imperative to create a reinforced belt.

Brick walls have greater resistance to point loads, therefore, to mount a Mauerlat on them, it is enough to use anchors or embedded parts. However, experts recommend the use of an armored belt for brick walls if the building is being built in an earthquake-prone region.

Roof fastening to the house

The most important and main task of the Mauerlat is the strong fastening of the roof to the house. Thus, the Mauerlat itself must be securely mounted to the building.

The main tasks of the reinforced base under the roof can be reduced to the following points:

• Maintaining the strict geometry of the building in all situations: seasonal fluctuations in the soil, earthquakes, shrinkage of the house, etc.;
• Alignment of walls in a horizontal projection, correction of inaccuracies and flaws made during the construction of walls;
• Ensuring the rigidity and stability of the entire structure of the building;
• Uniform and distributed distribution of the load of the roof on the walls of the building;
• The possibility of a strong attachment to the reinforced base of important elements of the roof, primarily the Mauerlat.

Calculation of the reinforced base under the roof

The process of reinforcing the base under the Mauerlat begins with planning and calculations. It is necessary to calculate the dimensions of the armored belt. By building standards it should be a width equal to the width of the wall, and not less than 25 cm. The recommended height of the reinforced base is around 30 cm. The armored belt and the Mauerlat laid on it should encircle the entire house.

If the walls are built from aerated concrete, then the top row is made of stone in the form of the letter U, which creates the formwork. It is necessary to lay reinforcing elements in it and pour the entire structure with a cement solution.

Before actually starting construction works it is also necessary to prepare the necessary tools and Construction Materials. To create a reinforced base under the roof, you will need:

• Concrete mixer for high-quality mixing of cement mortar;
• A specialized vibrator that accelerates cement mortar in the formwork, preventing the creation of voids from the air in the structure;
• Materials for the construction of formwork;
• Fittings.

Installation technology

Installation of the armored belt begins after masonry work. It is necessary to wait for the masonry to dry completely.

Creation of formwork and laying of reinforcement

The first stage is the construction of formwork. In buildings made of aerated concrete blocks, the last row of masonry is made from blocks in the form of the letter U. If these are not available, then the outer part of the formwork is created from sawn 100 mm blocks, and the inner part is made from boards. Installation is carried out with strict observance of the horizontal level.

A frame of reinforcement is laid in the formwork. Its longitudinal part is formed from 4 reinforcement bars with a diameter of 12 mm or more. Cross mounts are made of rods of 8 mm in diameter, subject to a step of no more than 25 cm. In the projection, the frame looks like a square or rectangle. The frame parts are mounted with an overlap of up to 20 cm. The joints are connected with a knitting wire. In solution, such a reinforced frame exists as a monolithic one.

Laying the frame provides for compliance with certain rules:

• The thickness of concrete from the frame to the formwork is not less than 5 cm;
• To comply with this rule, stands made of bars of the desired height are placed under the frame.

An important part of the work is the strengthening of the formwork frame. If this is not done, then it will be crushed by the weight of concrete. This can be done in various ways:

Installing fasteners for Mauerlat

After working with the formwork and laying the reinforcement, you can proceed with the installation of fasteners for the Mauerlat. We recommend using threaded rods. It is convenient to purchase studs with a diameter of 12 mm. The length of the studs is calculated taking into account the fact that their bottom is attached to the frame, and the top protrudes 2-2.5 cm above the Mauerlat.

Installation of studs is carried out taking into account:

• There is at least one hairpin between two rafters;
• The maximum installation step is no more than 1 meter.

Pouring with cement mortar

The main feature of the reinforced base under the Mauerlat is its strength. It can only be reached by pouring concrete mortar at once.

For creating concrete mix concrete is used not less than M200. The best blend for filling the belt is prepared according to the following proportions:

• 1 part of cement M400;
• 3 parts of washed sand and the same amount of rubble.

The use of plasticizers will help to increase the strength and hardening rate of the mixture.

Since a lot of mixture is required to create an armored belt at once, it is advisable to use a concrete mixer and a special pump for supplying the solution. In the absence of equipment, the help of several people will be required for the preparation and continuous supply of the finished mixture.

After pouring concrete into the formwork, it is important to expel all air from possible air pockets. For this, a special vibrator device and simple fittings can be used, with which the mixture is pierced around the entire perimeter.

Mauerlat installation

Removal of the formwork from the armo-belt is possible as soon as the concrete hardens sufficiently, and installation on the Mauerlat structure can be started no earlier than 7-10 days after the armo-belt has been poured.

Before laying the Mauerlat parts must be prepared in a special way:

• Mauerlat beam is treated with antiseptics;
• Compounds it individual elements performed by the method of direct lock or oblique cutting;
• Mauerlat is applied to the armored belt and places for studs are marked. Mounting holes are drilled.

The laying of the Mauerlat is preceded by covering the reinforced base with a layer of rolled waterproofing, as a rule, roofing material is used for these purposes.

Mauerlat is fastened with a large washer and nut; locknuts are used for safety. After tightening all the fasteners, the remaining tops of the studs are cut off with a grinder.

Summing up

A reinforced base under the Mauerlat is more of a necessity than a luxury. Roof structure renders quite big impact on the walls of the house, which, although evenly distributed due to the Mauerlat, can adversely affect the strength of the entire building.

The creation of an armored belt is necessary in buildings made of gas and expanded clay concrete due to the fragility of these materials, in areas with high seismic activity. It is also advisable to strengthen the walls under the Mauerlat when creating heavy roofing structures.

Reinforcement of the upper part of the walls is not hard work requiring the involvement of specialists. Subject to a number of rules and the involvement of assistants, it can be done on its own.

Armopoyas is a metal structure made by hand from reinforcement. Its purpose is to increase strength bearing walls and maintaining integrity under impact natural conditions and during ground movement. During the construction of the house, several such belts are mounted. The formwork for the armored belt is laid in order to create load-bearing walls or ceilings. It is poured with concrete until completely solidified.

The advantage of this formwork is the ease of installation, the minimum number of necessary materials and tools, small financial expenses and ease of disassembly. For stripping, you will need to remove the fasteners and remove the boards after the concrete has set. In the future, they can be reassembled and formwork made for another building.

The principle of creating a structure for an armored belt does not differ from the technology of formwork for a foundation or window openings.

Construction for a house made of aerated concrete

According to the scheme described above, you can make a formwork with your own hands for any type of house. The device is suitable for brick, aerated concrete, concrete. Armopoyas promotes high-quality connection of the roof to the frame of the building. In an aerated concrete house, it is attached using additional blocks or formwork. The first option is easier, but more expensive. Cheaper to do it yourself wooden structure. Instructions help to build it correctly:

Scheme of a section of an armored belt in a formwork for a gas block

1. Drill boards with a height of 30 cm to the wall of aerated concrete.
2. Every 50-70 cm fasten screeds to increase the strength of the structure and prevent deformation under the influence of heavy concrete.
3. Lay reinforcement inside with a diameter of 8 to 12 mm. The choice depends on the location of the house. If the walls are exposed negative impacts environment, then rods with a maximum diameter will do. In regions with a calm seismic situation, you can save on rebar by choosing inexpensive models with a minimum diameter.
4. Lay the rebar on special sprockets, which creates an active bottom layer on the aerated concrete blocks.
5. Tie the rods with wire.
6. Pour concrete, compact and level the layer.

If the formwork is installed for the purpose of fixing the roof, then before pouring the concrete, studs are installed for fixing the ceilings. They can be of any length, but it is more convenient to work with specimens less than 1 meter long.

Experts will help to make the formwork for the armored belt for the house from aerated concrete in case of difficulties. Before work, it is recommended to make calculations to prevent mistakes and purchase the right amount building materials.

Nuances when working with a wooden structure

Formwork device from wooden planks requires a smart approach. If the structure is installed incorrectly, there is a risk of breakage and rupture of the boards under the influence of concrete mortar. To do the work with your own hands correctly, you need to consider several nuances:

• the formwork device consists of boards, which must be fixed with careful control over the verticality and horizontality of the structure;
• the surface of the boards in contact with concrete is cleaned and leveled;
• for reuse elements, easy dismantling of the structure and prevention of concrete leakage, the shields are upholstered with a film on the inside;
• if you impregnate the boards with used oil or hydrophobic grease, it will be much easier to do the stripping with your own hands;
• boards are not allowed to be reused. If they were exposed precipitation, then they will certainly be destroyed during repeated operation;
• a fixed structure is rarely made, more often it is assembled from polystyrene foam blocks, with already built-in fittings. This is laid by stringing elements on rods;
• before work, it is worth making a choice between the initial manufacture of the armored belt and the formwork. In some cases, it is easier to lay the reinforcement on aerated concrete blocks, and then proceed to assemble the wooden structure.

The formwork for the rebar frame is made independently without the use of expensive materials and special equipment. But only competently organized and carried out work guarantees the creation of a reliable and solid construction. If there are difficulties during the assembly process, it is recommended to get the advice of professionals to prevent serious errors that could lead to the destruction of the structure.

Armopoyas, also known as a reinforcing belt, a reinforcing reinforced concrete belt, a reinforced unloading belt, as well as a seismic belt - this is a solid reinforced concrete structure around the house, following the contour of its walls.

It consists of a frame made of reinforcement and wire. The frame is immersed in a mixture of sand, cement and gravel. This mixture is called reinforced concrete.

The armored belt is the same foundation, but it is located between the floors of the building. A correctly filled belt serves to give strength to the walls by redistributing the load from all elements of the building.

• with a shallow foundation;
• when building a building on a mountain or hillside;
• if there are rivers or ravines nearby;
• if the soil under the building is subsiding;
• in the zone of seismic activity.

Most often, the armored belt is poured when the last row of building stone is laid on the wall. It can be a gas block, foam block, cinder block and other fragile material. The reinforcing belt increases the resistance of the structure to the force of the wind, the shrinkage process of the house, and seasonal temperature fluctuations.

If it is not necessary to build an armored belt for walls made of cinder block, then a structure made of foam blocks and gas blocks must necessarily have an armored belt. It is impossible to attach a bar to the wall of gas silicate stone, on which they will be installed rafter legs. Only a reinforced belt will help.

For two-story house you will have to fill in 2 such belts. The first armored belt is poured after the laying of the walls of the 1st floor is completed. Slabs will be laid on it later ceiling. After the completion of the laying of the 2nd floor, the next armo-belt is performed. Supports for the truss structure will be attached to it.

Formwork for armored belt

The height of the reinforced belt is usually 30 cm. Sometimes it can be a little less or more. Its width is equal to the thickness of the wall. For the construction of formwork, boards with a thickness of 20 mm or more are used. The bottom edge of the board is attached to the outer and inside self-tapping walls. The upper ones are connected by scraps of boards. You should get a kind of trough 30 cm high. In several places, the formwork walls can be fastened together with a knitting wire. You can make fastening jumpers every m. They will not allow the boards to bend under the weight of concrete.

Back to index

Creating a reinforcement cage

The frame is assembled from horizontally laid reinforcement rods with a diameter of 8-12 mm. They must be ribbed. Concrete mass clings to such rods more tightly. They are laid out in 2 threads. On top of the longitudinal rods, transverse crossbars are superimposed in the form of a ladder with a step of 70 cm. The frame is welded or tied with a knitting wire. In the corners of the building, the reinforcement can be additionally reinforced with corners welded to it.

The frame elements should go deep into the concrete by about 5 cm, so brick fragments are placed under the reinforcement from below to raise it. If the load is assumed to be quite high, not a ladder is used for reinforcement, but a three-dimensional structure of 4 longitudinal reinforcing bars, which are connected in the form of a parallelepiped. At the ends and in the middle they are connected by welding. The remaining connection points should be correctly connected with wire, since welding weakens the structure of the metal.

Back to index

Formwork pouring

It is recommended that before pouring the upper armored belt, lay pieces of wire in the formwork after 80-100 cm. It will be attached to the belt in the future wooden bars on which the rafter legs are installed. For filling use ordinary building concrete from a mixture of sand, cement and gravel. The proportions are approximately the following: 1 part of cement, 3 parts of sand, 4-5 parts of crushed stone. It is recommended to pour the entire formwork in 1 cycle. The solution must be periodically compacted by piercing it with a piece of reinforcement to release air.

In the hot time of the day, you need to water the structure abundantly and cover it. plastic wrap. This is done so that the concrete does not crack during intensive drying, and the moisture does not evaporate too quickly. So the concrete will quickly gain strength. After 4-5 days, the formwork can be carefully dismantled. But for the full maturation of concrete will take 2-3 weeks. It is recommended for a better connection of concrete with the wall to make a kind of hedgehog from nails hammered into blocks or pieces of wire.

In the construction of private residential buildings from block materials(brick, aerated concrete and others) for additional protection from movements and deformations of the walls and load-bearing structures an armored belt is always provided. This reinforced concrete structure, arranged along the entire perimeter of the building, reduces and redistributes external and internal stresses on the walls and foundation, resulting from seismic activity and ground movements, wind exposure, and stresses from the internal structures of the house.

Due to possible changes in the soil and features internal structure building walls on different areas houses can receive different levels of loads that cause compression and torsion of the material. If the load reaches critical values, cracks form.

For low one-story houses the foundation copes well with the role of the armo-belt. But with a significant height of the walls (two or more floors), critical loads are created in the upper part, for the uniform redistribution of which a special additional structure is needed - a concrete belt with metal reinforcement. Its presence increases wind protection for the walls of the house and bursting loads from the mass of the upper floor and roof.

Expert opinion

Sergey Yurievich

The practice existing in construction proves that the width of the armored belt is quite sufficient if it corresponds to the thickness of the wall. The height can vary in the range of 150-300 millimeters. For the construction, profiled metal can be used (corner, single-tee or double-tee beams, fittings). Note that the armo-belt itself in such a house or in an aerated concrete extension performs the functions of an I-beam, which is most resistant to stress.

Armor belt under Mauerlat

The functions of the armored belt under the Mauerlat are the same - ensuring the strength and reliability of the wall structure. Features of the design in its dimensions. As a rule, the minimum section is 250 x 250 mm, and the height should not exceed the width of the wall. The main requirement is the continuity of the structure and the same strength along the entire perimeter of the walls of the house: at a minimum, the armored belt must be monolithic. In order to achieve continuity, it is recommended to use concrete of the same brand for pouring (at least M250).

Mounting the Mauerlat to the armored belt

Expert opinion

Sergey Yurievich

Construction of houses, outbuildings, terraces and verandas.

The easiest way to attach the Mauerlat to the armored belt is with threaded studs.

The diameter of the studs should be 10-14 mm. At the base, crossbars should be welded.

Using raw concrete to fill the armored belt under the Mauerlat, you should take care of the placement of the studs in advance:

• they should be rolled in advance to the reinforcing cage placed inside the concrete;
• the distance between the studs should be the same;
• so that the concrete does not contaminate the threads in the outer part of the studs, they must be covered with cellophane and wrapped with wire;
• that part of the studs that will be inside the concrete should be protected from corrosion - paint is quite suitable for this (oil or nitro-based - it does not matter, you can also use primer).

The outer part (length) of the studs should be sufficient so that, in addition to the Mauerlat itself, two nuts and a washer can be screwed to them. AT ideal the attachment points of the Mauerlat to the armored belt should be located as accurately as possible in the middle between roof structures. At the very least, the rafter legs should not coincide with the studs, otherwise you will get additional problems when installing the roof, so you should pay attention to the accuracy of marking and installation in advance.

Armopoyas for floor slabs

The presence of heavy floor slabs creates increased loads on the walls. To wall materials did not deform under their weight, an armored belt is used at the height of the junction of the floors. Such a reinforced concrete tape should be built under all floors around the entire perimeter of the house. The distance from the slabs to the armored belt should not exceed the width of one or two bricks during the construction of brick buildings and other objects from stone materials or with slag-filled walls (ideally - 10-15 cm).

Expert opinion

Sergey Yurievich

Construction of houses, outbuildings, terraces and verandas.

Do not forget that inside the armored belt under the floor slabs there must be a reinforcing cage. We will dwell on its features a little later. It is important that there are no voids in the armored belt under the floor slabs.

Brick armored belt (video)

The armored belt made of brick is a common brickwork, enhanced reinforcing mesh. Sometimes, to enhance strength, the brick is placed not horizontally, but vertically on the ends. However, many craftsmen recommend making a brick armo-belt only in conjunction with a full-fledged reinforcement of the wall with a reinforced concrete belt.

Formwork for armored belt

For the formwork device, which is mandatory when pouring a concrete armored belt, you can use:

• factory structures (offered for rent by many construction companies);
• polystyrene (foam of fine porosity);
• shield prefabricated formwork from boards, moisture-resistant plywood or OSB.

Given that the casting of the armored belt must be uniform and carried out simultaneously along the entire perimeter of the house wall structure, the formwork must also be mounted in advance on the entire object.

Expert opinion

Sergey Yurievich

Construction of houses, outbuildings, terraces and verandas.

It should be noted that top part formwork should provide a perfectly horizontal position for the armored belt (this is especially important when it is necessary to correct the flaws in the masonry of the walls). Therefore, when constructing formwork for concreting the armored belt, a water level should be used.

Armopoyas under the roof

The functions of the armored belt under the roof can be formulated in the following paragraphs:

• ensuring strict geometry of the building box during shrinkage of the wall structure from seasonal soil changes;
• the rigidity and stability of the building;
• dispersal and uniform distribution of loads from the roof to the box of the house.

The armored belt under the roof also performs a function that provides the possibility of a strong fastening of the mauelat and truss system, installation of overlap (including - from reinforced concrete slabs) between the upper floor and the attic of the house.

Reinforcement for armored belt

Reinforcing mesh (framework) for the armored belt is necessary to strengthen and give greater strength concrete structure. Might have a square go rectangular shape by section. It consists of four working longitudinal rods and intermediate jumpers.

For fastening the reinforcement to each other, electric welding or knitting wire is used. Optimum diameter reinforcement - 10-12 mm. To increase rigidity, a separate rod is laid inside the reinforcing cage. Longitudinal jumpers are fastened together every 200-400 mm. To stiffen the corners of the armo-belt, an additional bent rod is inserted to each side of the corner of the wall at a distance of approximately 1500 mm.

Composition of concrete for armored belt

As we said above, concrete grade M250 and higher is suitable for the armored belt. The pouring of the structure must be carried out continuously, therefore it is more advisable to pre-order the delivery of the required amount by mixers at the nearest concrete plant.

Otherwise, you will need:

• two concrete mixers;
• sand;
• cement (recommended not lower than grade M400);
• gravel or crushed stone;
• water.

Two concrete mixers will be needed to ensure the continuity of pouring the armored belt with fresh concrete. A specialist in the preparation of the concrete mixture and a number of auxiliary workers will also be needed to load the concrete mixers and carry the finished concrete to the installation site of the armored belt.

Video instruction on the construction of an armored belt with your own hands