mistakes when building aerated concrete walls
Today we will talk about the mistakes that are most often made in the construction of aerated concrete private houses. It would seem, where to make mistakes? After all, the device technology of the building from aerated concrete thoroughly thought out, there is a national standard on them, the leading manufacturers of blocks, in particular Ytong, provide detailed instructions, the blocks are easy to lay and handle. Nevertheless the culture of construction in our country is still lame on both legs, and wrong decisions when working with aerated concrete, unfortunately, are not uncommon.
The negative consequences of these mistakes are the same as in the case of any improperly executed masonry (solid bricks, porous ceramic, foamed concrete, etc.).). The main problem is cracks that spread through the masonry. In principle the appearance of cracks, even cracks, up to 2 mm wide in masonry exterior walls, is not considered a sign of emergency condition of the building. However, it can lead to other troubles:
- Spreading cracks in the exterior and interior finishes. Expensive repairs may be needed.
- Freezing of the walls and, consequently, an increase in heating costs
- Deterioration of the microclimate in the living space.
- In the most unfortunate outcome. violation of the integrity of the structure of the building.
The appearance of cracks can be caused by a number of violations made by builders.
Errors in the construction of the foundation
Aerated concrete masonry is not the most resistant to bending. And if the foundation, on which it is based, is not rigid and stable enough, has significant deviations in geometry, does not match the type of soil and terrain on the site, the masonry may in some places sag and crack. To avoid this, you need to properly design and quality of the foundation. When constructing it, it should be taken into account:
- Features of the soil on the site: its degree of heaving, the level of groundwater. This information can be obtained only on the basis of geotechnical surveys. The neighbor survey method is extremely inaccurate and should not be relied upon.
- The specific terrain: the presence of slopes, height differences.
- All loads on the foundation. They can only be determined by a calculation performed by a professional constructor.
Experts recommend arranging a reinforced concrete foundation under the gas concrete house. works well shallow bands or plates, including very popular today insulated Swedish slab (ISP) and insulated Finnish foundation (UFF, tape combined with insulated floors on the ground). Acceptable, among others, are foundations of FBS blocks with obligatory strapping belt on the top row, such as monolithic.
Errors in laying the first row of blocks
The first row of blocks determines the geometry of the entire masonry. If you do not lay it evenly enough, with deviations from the correct height marks, with off-set diagonals, then the correction of errors with subsequent rows will not work. On the contrary, errors will only increase.
Blocks of the first row are stacked on the usual cement-sand mortar thickness not exceeding 20 mm. But this does not mean that the mortar can level out severe differences in height on the plane of the foundation. The allowable deviation from the horizon line. 30 mm. If it is more, you will have to level the foundation (at the expense of the contractor, who performed his work poorly) and only then begin masonry.
Small height differences between adjacent blocks in the row are eliminated by sanding board or planer. The evenness of masonry control using a laser or optical leveler.
The first row of blocks must be secured against the capillary rise of moisture through the foundation. To this end, between the wall and the foundation, waterproofing is provided: bitumen roll-fed and sealing materials, polymer cement compounds, etc.
Learn more about working with aerated concrete on the courses on construction from Ytong
Mistakes when choosing a glue mix
Application of thin seam adhesive composition
A big mistake. to build walls of aerated concrete with conventional cement-sand mortar, while receiving the same thickness of joints, as in conventional masonry walls. up to 12 mm. Such a thick joint leads to substantial heat loss from the house, negating the energy efficiency advantage of aerated concrete over other masonry materials. And vice versa, if you use special glue for aerated concrete, the thickness of the seam will be only 1-3 mm, heat loss is minimal.
Regular mortar instead of glue is chosen by people who want to save money, but misjudge the possible costs. The mortar joint is 4 times as thick as the glue joint, and therefore costs 4 times as much. While the cost of conventional cement-sand mixture is 2 times cheaper than glue. The result is double overpayment for regular mortar. Plus higher transportation costs.
Another mistake is to use cheap glue instead of more expensive but recommended by the manufacturer of the blocks. How dangerous is cheap? There may be a large amount of tri-calcium aluminate, because of which the composition is not sulfate-resistant. This type of adhesive can crack over time and cause cracking of the masonry joints. In this regard, Ytong recommends using only adhesives under its own brand name. Because this composition has been tested in leading German laboratories, and its quality is not in doubt. information about Ytong glue can be found here
Mistakes in the binding of blocks
The masonry must withstand bending and shearing forces. To do this, properly tie the adjacent rows of blocks. According to Russian regulations, the size of the banding of blocks of height 250 mm should be at least 40% of the block height. That is not less than 100 mm. German standards, which focuses on Ytong, even more stringent. not less than 125 mm. over, it is forbidden to use in masonry cut elements shorter than 50 mm. And the scrap of larger size is allowed to have at a distance of 125 mm from the joint between the blocks of the bottom row. Improperly executed leveling is fraught with cracking.
Errors at the conjugation of supporting walls and partitions
Wall masonry joints with flexible bonds
It is unacceptable to rigidly connect load-bearing walls to partition walls, i.e. to tie them together with blocks or, for example, to connect them with scraps of rebar hammered into the walls. In the place of such joints cracks can appear. The thing is that the load-bearing and non-bearing walls are loaded differently and give unequal subsidence. To compensate for it, they are coupled with flexible ties (anchors) that allow for small deformations.
But load-bearing walls (inside and outside) and partitions, on the contrary, must be rigidly connected to each other. using the binding.
Lack of reinforcement in the sill areas
Contrary to popular belief, masonry with quality aerated concrete do not need to reinforce. However, you should always reinforce the sill areas, because in the corners of openings serious stresses are concentrated and they need to be removed. For this purpose, in the sill row of the sides set the reinforcement: it must protrude beyond the boundaries of the opening on each side for a distance of at least 50 cm. Usually two bars of steel (less often. composite) reinforcement 8-10 mm in diameter are used. The bars are placed in the previously made troughs, and then filled with cement mortar or glue for aerated concrete. When installing the armature in the mortar cross-section of the jamb should be at least 40×40 mm, and when mounted in adhesive composition is enough section 20×20 mm. Each slot is performed at a distance of 50-60 mm from the edge of the masonry. It is also acceptable to reinforce with basalt or fiberglass mesh.
If the builders forgot to reinforce the sill areas, it is likely that the appearance of cracks in the corners of openings can not be avoided.
Lack of reinforcement under the roof leads to cracks
Often builders forget about the reinforced concrete reinforcement, in particular, under the overlap on the wooden beams. Or make serious mistakes in its construction. For example, in the roof area provide reinforcement belt only under the mauerlatum. a bar that supports the rafters. But do not do it on the gables, that is do not close it in a continuous loop around the perimeter of the building. In this case the rafters flatten the walls and cause cracks in the masonry.
Conclusion: It is necessary to continue the reinforcement belt along the gables, closing it.
Strengthening of the house structure after its construction
In the extreme case. to eliminate the spreading by additional racks under the roof.
Arrangement of the armopoyas during the construction of the building
Armopoyas is needed for the even distribution of loads on the walls and foundation of the building. Arms support is arranged in the load-bearing walls under the floor and roof. Usually it is a reinforced concrete beam cross-section not less than 100×100 mm. This beam is built, for example, inside U-shaped aerated concrete blocks or between the standard blocks of small thickness (partition). To prevent the house from freezing, the reinforcement belt is closed from the outside with insulating plates (30-50 mm thick), usually made of polystyrene foam.
Bearing reinforced concrete frame in a low-rise building
Some customers believe that aerated concrete is not strong enough material, and therefore in the construction of a two-or three-story house provide load-bearing framework of cast-in-place reinforced concrete, which is filled with aerated concrete. This is an unreasonable and irrational complication. Masonry of aerated concrete blocks is a load-bearing wall, and therefore there is no benefit from such a framework. But the harm is palpable. Reinforced concrete construction is a large-scale bridge of the cold, it needs to be insulated. Excessive concrete work (formwork, reinforcement, mortar), combined with additional insulation. all this is a significant waste of money and time, which is completely unnecessary.
Vapor-proof exterior finish
Destruction of finishes due to the use of vapor-proof plaster
Aerated concrete comes to the construction site, having high humidity. In addition, it transmits water vapor tending from the living space to the street (the lower the density of blocks, the higher their water vapor permeability). It is a big mistake to seal gas concrete walls with a vapor-proof finish, such as cement plaster with a density of more than 1300 kg/m 3. Especially right after finishing masonry work. The walls will not dry out from the building and industrial humidity, which will reduce the service life of the aerated concrete, as well as the finish.
Destruction of finish because of the use of vapor-proof plaster
The consequences of using high-density cement plaster
In addition, ceramic facing brick masonry should not be built close to an aerated concrete wall: brick is less vapor permeable than aerated concrete. When constructing such cladding leave a ventilation gap of at least 40 mm between it and the wall. And flexible stainless steel or fiberglass connections between brick and aerated concrete masonry are mandatory.
Attachment of brick cladding to an aircrete wall
Other popular cladding materials. Decorative concrete stone and clinker tiles. They also have low water vapor permeability, and if they will cover more than 25% of the facade area, you need to provide for them with a ventfasade with a subsystem.
Vapor-tight thermal insulation
If you need to insulate gas concrete walls, it is safer to apply vapor-permeable insulation. from stone or glass fiber. But with the polymeric thermal insulation materials (EPPS, EPS, PPU, PIR), which have a very low vapor permeability, everything is more complicated. In principle they can be used, but with a number of reservations:
They should not be mounted on fresh, not fully dried masonry.
The thickness of polymer insulation should provide not less than half of the thermal resistance of the envelope structures. For example, the wall from D500 blocks with a thickness of 300 mm must be insulated with extruded polystyrene plates with a thickness of 100 mm or more.
It is desirable to insulate houses with polymeric materials, where in the permanent mode works supply and exhaust ventilation, which removes from the premises of excessive water vapor.
Learn more about working with aerated concrete on the courses on construction with Ytong
Errors in the construction of the building from aerated concrete
Designing a low-rise building with monolithic reinforced concrete frame, filled with aerated concrete blocks
Aerated concrete blocks have sufficient load-bearing capacity to build load-bearing walls from them. There is no need for a reinforced concrete frame.
The foundation is not rigid and stable enough, has geometric deviations, does not match the type of soil and terrain on the site
Design foundations with the specifics of the soil, terrain, all loads on the base
Lack of waterproofing between the foundation and the first row of blocks
Provide between the foundation and the wall waterproofing bituminous roll-fed or wrapped material, polymer cement compound, etc.
Irregularities, deviations from height marks, displaced diagonals in the first row of masonry
Level the foundation, lay the blocks of the first row on the cement-sand mortar, remove small differences in height between the blocks with an abrasive board or planer. Check the evenness of masonry by means of a leveller
Laying blocks on the ordinary cement-sand mortar. The use of adhesive solution that is not recommended by the manufacturer of aerated concrete
Starting from the second row of blocks use the glue mortar for thin joint masonry, recommended by the aerated concrete manufacturer
Perform the interlocking of blocks size of not less than 100 mm
Gap in the reinforcement of the last row of the top floor: apply reinforcement under the mullion, but without continuing along the gables
Before pouring the concrete make sure that the contour of the reinforcement belt is continuous around the perimeter of the building
The lack of reinforcement in the sill areas
Reinforce the sill row of blocks using two bars of rebar with a diameter of 8-10 mm, laid in the trenches. The bars should extend beyond the boundaries of the opening on each side by at least 500 mm
U-block lintel mounting for openings over 2.5 m in clearance
The rigid coupling of supporting and non-supporting walls (with the help of interlocking blocks)
Perform such conjugations with flexible links
No movement joint between the non-bearing partition walls and the floor, and between the non-bearing aerated concrete partition wall and the bearing wall
Execute in the appropriate places U-shaped expansion joint thickness of 20-30 mm and fill it with installation foam or fiber insulation
Insulate walls made of aerated concrete with vapor-tight polymer thermal insulation materials (EPPS, EPS, PPU, PIR) without compliance with the requirements of the aerated concrete manufacturer
Exterior walls made of 375 mm thick aerated concrete blocks with a density of D400 do not need to be insulated. If you still want to insulate the facade, you must use a vapor-permeable insulation (mineral wool). If you apply a polymer material, it can be attached only on the finally dry masonry. The thickness of such insulation must ensure at least half of the thermal resistance of the building envelope. Provide for supply and exhaust ventilation in the living areas of the building, insulated with polymer materials
Lack of external waterproofing of the first floor units with a plinth height of less than 500 mm
Before finishing work, waterproof the lower part of the masonry with sealing or sticking insulating materials so that the plinth to a height of 500 mm is protected from moisture
Finish the walls with vapor permeable materials or materials with lower vapor permeability than aerated concrete
Use vapor-permeable plasters. When cladding the facade with ceramic bricks, leave a ventilation gap of at least 40 mm between the cladding and the wall. When cladding the walls with concrete stone or clinker tiles, provide for a ventilated facade system (provided that such cladding will cover more than 25% of the facade area)
Advantages and disadvantages
Gas concrete blocks have such positive qualities:
- not subject to rotting;
- Have a high frost resistance and thermal insulation;
- Are made of mineral components;
- environmentally safe;
- have low natural radioactivity;
- quickly and easily installed;
The disadvantages of gas blocks are much less. The main disadvantage. pores, because of which the material needs additional waterproofing and mechanical protection.
Ways of laying
Preparation of mortar
To date, there are two methods of laying of aerated concrete products with their own hands, this masonry aerated concrete blocks on the cement mortar and the adhesive mixture. But, in spite of the chosen method of laying, the first row must be laid on the cement mortar. The dosage of the components should be such, so that the resulting masonry mixture does not flow, because otherwise the unit will not lend itself to fixing. If the construction is large in volume, it is much more convenient to knead the mortar not with your own hands, but with the help of a concrete mixer.
In order the resulting mortar had a homogeneous texture, it is better to use equipment, working on low speed for mixing. To mix the adhesive from five kilograms of dry mixture, pour a liter of water into the vessel. Pour the dry glue little by little into the jar and whisk it at once. Allow to infuse for ten minutes, then whisk thoroughly again. The adhesive mixture can be considered ready when it is similar to a thick sour cream consistency. If the glue dried and hardened, it is forbidden to dilute it with a new mixture or water.
A similar mortar can be used to make the paving in blocks. It is made by mixing all the ingredients and a special binder. Such compositions are characterized by ease of preparation and reliability of use.
The formulation of such mixtures can vary slightly, depending on the required task. If it is necessary to obtain a more plastic mixture, then clay is added to the composition. Such a mixture in operation does not crumble and does not crumble, allowing you to accurately and easily lay the building material. The use of special plasticizing components in the cement mixture for aerated concrete allows high-quality installation of facade walls. Such a mixture is very economical, gives good thermal properties, easy to use and masonry. Due to its advantages, many workers still more often work with this mixture, and not with glue.
What to choose?
When performing construction work, specialists are interested not only in how to lay aerated concrete, but also what mixture to choose. After all, both the first and the second option have a lot of advantages. It is necessary to take into account that both mixes have a much greater thermal conductivity than the blocks. From this it is obvious that the thermal insulation of the whole building depends on the joint width. If you use a cement mixture, the joint width will be about 9 millimeters. In the case of the adhesive, the width of the joints does not exceed 3 millimeters.
Given that the price of glue is more, we can initially assume that its use will significantly increase the cost of installation work. But, taking into account its minimum consumption, in reality the costs increase only a little, and the building comes out much warmer. But if you use a cheaper cement mix, it becomes clear that a lot more of it is needed, and the installation costs will inevitably go up. From this comparison it is clear that the use of adhesive in laying on the blocks is a more rational solution, beneficial and correct.
Before you start the installation work with your own hands, you need to unpack the blocks and place them next to the row paving. When carrying out construction work on the installation it is better to use a special adhesive mixture. In the case of such a choice, you will be protected from the formation of cold moths in the masonry areas. It is not recommended to use cement mixture, because, despite its low cost, the consumption is much higher, and the joints look sloppy and too wide. Also such a choice worsens the thermal insulation of the future home.
Before you start the masonry installation of blocks, it is worth putting special beacons. Install them in the perimeter of the façade, at the joints. They are needed for leveling, to fix with their help a special wire, which controls the evenness of walls and partitions. Fasten the wire with galvanized nails. Also, we must not forget that the masonry instruction is an important element of any construction operations.
Mixing the mixture
For preparation it is necessary to prepare a special container and an industrial mixer. To mix the mixture, use a special dry mixture and warm water. Kneading continues until the mixture becomes homogeneous in consistency. It should be worked out for 20 minutes, because of this small doses are kneaded. During the operation of the adhesive, it is necessary to stir it constantly, so that it loses its homogeneity.
If the construction takes place at low temperatures, it is necessary to use a special type of masonry mixture. It contains special components that prevent freezing, allowing it to retain its characteristics even at low temperatures.
The masonry walls are not laid until the products have been fully marked. Marking is carried out along the axes of all surfaces of the future facade. Material is then taken, delivered to the place of installation and distributed along the chosen axes. When performing the tying procedure, use incomplete material, which will be located at the corners.
It follows that first we need to make a cut of the products. It is not difficult to perform, because the cutting is done with a saw or hacksaw. To ensure that all the structures were evenly cut, it is worthwhile to use a special ruler when marking. It is necessary to prepare in advance the materials that will later be reinforced.
First prepare the blocks that are necessary for laying the first row, then make grooves for reinforcing bars during the installation of the facade.
Laying and reinforcing
The process of assembling the walls and partitions of the future building is not complicated, but it is important to do it right. Only then the entire process will take place quickly, and the construction will be of high quality. First prepare the building material and special mixture for the work. To perform the first row, you must perform the procedure of reinforcement. After that, the surface is applied glue and distribute it with a special comb. The thickness of the seam should not exceed 4 millimeters.
Masonry installation should be done with a binding, each item must be shifted to a distance equal to half of one structure. If the tie-over is not performed, it will adversely affect the properties of the walls. Do not grout the joints, which have come out of the joints, but remove them with a trowel. For the evenness of masonry use a special cord. The evenness of the work done is determined by the construction level and a special ruler.
When properly installing the walls with their own hands can not be disregarded and the issue of waterproofing. To perform it, use a special grid. Make sure to fasten the waterproofing grid on the walls in the area of contact with the foundation. Once the partitions have been erected, they must not be left unprotected. It is worth to immediately perform facade and insulation operations. In the case where it is not possible to do it immediately, then the row tries to cover with a special polyethylene mesh, until it is possible to finish everything. Reinforcement is planned even when preparing for construction. This is a must if the wall is too long or if the box will be under increased pressure.
Laying and reinforcing aerated concrete blocks.
Under this procedure is subject to all lintels, the length of which is more than 90 centimeters. And also all the bottom joints of the openings. This operation can be applied in two ways, using metal rods or a special grid. During installation, special grooves are cut into the blocks, into which the rods are inserted and the adhesive is poured. After that follows the laying of the next row.
The mesh during the construction of the building is required to increase the strength of the facade and to prevent cracking in the walls. The metal mesh is placed at intervals of 3 rows of aerated concrete blocks. Most often such materials are used to perform reinforcement:
Checking the correctness of masonry
After laying the building material with your own hands, it is worth checking the thickness of the layer of glue and the quality of the work done. In this will help a building level, the rule and a special ruler. The ruler is leaned against the erected wall, the building level is placed on top. If it is located accurately, you can find out the deviations in the work. It is desirable to do it not only at the end of the process, but also in the course of the entire installation work. If the deviations in the thickness or location of the walls do not exceed the allowable values, then there is no need to redo everything.
For laying a gas or foam concrete wall, the following tools will be required:
Основные ошибки при возведении перегородок из газобетона #5
- Drill with a whisk. quickly and efficiently knead masonry mortar;
- A trowel to distribute the mortar used for laying tiles;
- Any saw that allows you to quickly saw construction foam blocks;
- wooden or rubber mallet
- a spirit level (liquid or laser level).
Instead of a hand saw, you can also use an angle grinder with a cutting disc for wood.
The fact is that foam, unlike solid brick, is quite soft and at a certain point it is relatively easy to break. Do not knock on the blocks with an ordinary hammer. they quickly sag, and the material loses its strength, which depends on the ability of the walls to reliably hold the ceiling, attic floor slab and roof.
How to prepare the glue
Before proceeding to the preparation of the adhesive solution, you should carefully study the manufacturer’s instructions, which specify the necessary proportions for this type of product. To ensure that the adhesive mixture turns out to be of high quality, it is important to observe the following rules:
- The water for mixing must be warm.
- Pour the dry mixture into the water, not vice versa (then the mass will be homogeneous, without lumps).
- Use a construction mixer with low speed to get a mix of the right consistency.
- If the work is carried out in winter, the glue must be mixed in a heated room, and it must have a t of at least 10 C.
- Do not use the mixture longer than the specified time. working time with summer glue 30-40 minutes after mixing, winter composition should be used within 2-3 hours.
Professionals prepare a solution in 2 stages. after the first mix wait 2-3 minutes, then mix again and proceed to the surface of the blocks.
Attention! The surface of aerated concrete blocks should be cleaned of dirt and dust, otherwise the bond will not be strong.
Features of masonry aerated concrete blocks
Aerated concrete. building material, which is created by mixing certain components that are processed at high temperatures. The material is lightweight, high strength characteristics, good thermal insulation. Another advantage. easy processing blocks. Aerated concrete is well sawn, chiseled, sanded, chiseled with simple tools. Consider the peculiarities of masonry aerated concrete blocks, starting with the selection of tools and materials, ending with masonry work.
Masonry technology with their own hands aerated concrete
Aerated concrete structures have recently gained popularity among many construction companies. It is an affordable and simple way to build a durable home, garage or other needed structure. Installation with their own hands to master it is not difficult even for beginners. Knowing the details of working with the material, the construction process will not cause certain difficulties, and the result will last for many years.
Proper approach to choosing aerated concrete is half the success of construction. It affects the strength and insulating qualities of the future building.
Aerated concrete blocks have advantages over other masonry materials. They have less weight due to the porous structure due to the peculiarities of their composition. In fact, it is a mixture of sand, cement, lime and aluminum powder, with the addition of foaming plasticizers.
Guidelines for the selection of quality material includes the selection, taking into account the density of gas blocks. It is denoted by the letter D in the documentation. The trick is that by increasing the porosity, insulation properties increase, but the strength of aerated concrete suffers.
Based on the indicators of the density of aerated concrete blocks, there is a difference:
Based on these characteristics, the best solution for a particular type of work is selected. For example, for masonry walls of aerated concrete as part of a reliable and durable residential building, should use a value of not less than D500.
It is worth giving preference to well-known brands of manufacturers of aerated concrete, as makeshift materials can not provide the proper quality of masonry aerated concrete blocks.
The standard size of aerated concrete is 62,5×25 cm. Its width may vary depending on the application. Thus, the thickness of aerated concrete walls is set by the standard:
Another important innovation, which allows saving construction mortar, is the technology of aerated concrete production using the “tongue and groove” joint system. Such a fastener will allow you to perform operations with bricks yourself without the help of outsiders.
In the budget option under the masonry blocks used cement mortar, prepared by their own forces with sand at a ratio of 1:3. Some experienced builders recommend adding a small amount of any plasticizer in the preparation instructions for evenly mixing the mixture.
Modern technology has thought of a line of more reliable and digestible means, especially when used in the winter. Ready masonry mix is made from a number of innovative components, giving the connection not only the necessary strength and reliability, but also frost resistance, and reduce the thickness of the adhesive layer.
Glue for aerated concrete allows you to create a thickness of the glue layer of not more than 3 mm. This is important to prevent the formation of thermal bridges, and thus enhance heat-saving properties of the building.
However, the installation of aerated concrete blocks of the first row should preferably be carried out with cement mortar, while the laying of blocks on polyurethane adhesive is allowed to produce in subsequent rows. Also, some masters do not advise to use precast for the construction of load-bearing walls.
Pros and cons of aerated concrete as masonry blocks
The positive characteristics of aerated concrete allow you to effectively use this material for the construction of country houses and cottages. Stacking technology of aerated concrete blocks is quite simple, thanks to these characteristics of the material:
- The small weight of aerated concrete blocks provides not only ease of transportation and carrying out loading and unloading work, but also the ease of laying;
- aerated concrete is easy to work with;
- Precise geometric dimensions increase the ease of execution, quality of installation work and high speed of their implementation;
- The ability to acquire any shape makes it easy to solve any design projects.
Also, when building walls of aerated concrete it is necessary to consider the following disadvantages:
- Brittleness of the material and low resistance to mechanical stresses requires the observance of protective measures during transportation, storage and installation work;
- Any natural movement of the soil, shrinkage of the material, errors in the construction of the foundation cause the formation of numerous cracks on the surface of the walls;
- The high indicators of hygroscopicity of the material, due to which the incomplete constructions poorly endure the winter and require the preservation of the object;
- In the construction of the walls have to do reinforcement;
A house made of aerated concrete has a rather impressive number of disadvantages. However, most of them can be completely eliminated or significantly reduce their impact if the technology of construction of a house of aerated concrete blocks, starting with the construction of the foundation and finishing the interior decoration will be followed precisely. The involvement of experienced masters, who have many years of experience working with this material, will ensure high-quality performance and reliability of the building.
Quick instructions for masonry
The first row of blocks must be necessarily laid on a waterproofing layer that will protect the material from moisture infiltration from the foundation. The very first row of blocks is placed not on the glue, but on the usual cement mortar. It is desirable to start masonry from the corners, pulling between them marking cord.
If the gap remaining in the row has a shorter length than the whole block, you can cut out a filler block of the specified dimensions. The next rows are placed on the glue mortar with the mandatory binding of blocks, as in case of masonry.
The glue is applied to the gas blocks with a trowel or a special carriage, the width of which is equal to the width of the masonry. The sides of the blocks is also desirable to dab the adhesive, especially if the subsequent decoration of one side of the room will be missing.
The layer of glue should not be thick, as it provides an excellent connection of joints, even at its most minimal consumption. for glue varies enough and depend on its volume and brand manufacturer.
The leveling of the blocks is done with a rubber or wooden mallet.
Please note that the reinforcement does not reinforce the masonry, but only prevents the cracking of the walls. Nevertheless this operation is recommended for all large structures. Not all rows are reinforced, but only some of the most vulnerable areas. These are the locations of lintels, supporting zones, the first row of masonry, the areas under window openings. The reinforcement of the upper part of the gas blocks along the length.
Material for reinforcement can be of two types:
- A frame of two rows of steel wires connected rigidly by thinner lintels. A single layer of the skeleton is laid.
- Steel reinforcement of 6-8 mm. Reinforcement requires the laying of two parallel rows of reinforcement.
Before laying the reinforcement it is necessary to make a chink in the aircrete. A standard floor saw is used for this purpose. Dust off and fill in the gaps with glue. Then the reinforcing material is placed in them, removing any glue residue.