Fastening the Mauerlat to aerated concrete or foam concrete, as a rule, is carried out using a reinforcing belt located at the top of the wall structures. It is he who becomes the support for the Mauerlat and provides great strength to the entire house.
What is an armopoyas for?
As you know, aerated concrete is characterized by high sensitivity to local loads. That is, if the permissible pressure of the drill used to create holes in the block is exceeded, there is a high probability that it will be covered with cracks or completely split. To prevent such changes, an armored belt is equipped, it also allows you to avoid slipping and deformation of the blocks, which leads to the uneven pressure of the total weight.
What you need to know
The functions of the Mauerlat are to connect the building box and also to share the load with all the walls. Mostly wood is used for the manufacture of fasteners. The best option is a hardwood timber, the surface of which is covered with an antiseptic composition.
It is desirable that the fastening of the Mauerlat to the aerated concrete wall be continuous along the entire perimeter of the wall structures. For fixing the individual elements, a straight lock of a suitable size is used. To ensure rigidity, nails are driven in, as a result, the bars form a single system for mounting rafters, connected with neighboring elements. The bars should be on the inside of the masonry, while to the outside there should be at least 5-6 cm. To support the Mauerlat, a brick parapet is made along the outer edge of the wall, some parts of which are fastened with a direct lock.
Methods for attaching the Mauerlat to aerated concrete walls
Several techniques can be used to suit different conditions:
- fixation with studs mounted in the masonry;
- anchorage based on an armored belt;
In the latter version, the wire is laid between the bricks in such a way that the middle part is located under them, and the outer sides are outside. The length should be sufficient for free threading through the bar and subsequent tightening. The number of straps should correspond to the number of rafters. With the help of a metal wire, the Mauerlat is further fixed to the wall.
Reinforced Belt
Fastening the Mauerlat to aerated concrete with an armored belt is the most preferable, since the blocks differ in an insufficiently dense structure and the complexity of mounting clamps of any kind. It is worth noting the advantages of using a reinforced belt. First of all, this is the alignment of the upper part of the walls and the strengthening of the entire structure of the house; when arranging it, clamps for the Mauerlat are created in advance. In execution, the simplest is the use of U-shaped block elements in the form of a gutter along the perimeter of the external wall structures, while there should be no interruptions. Next, a cut is formed on the corner parts. For the assembly of the frame, reinforcement with transverse lintels is used, then it is laid in a gutter, followed by pouring a concrete mixture. To ensure solidity, the mass is poured in one step. Before this, anchors with wire are fixed on the reinforced belt. Careful compliance with the level is of particular importance. The studs are also fixed to the frame along the line in accordance with the tensioned cord, in a vertical position. Just as in the case of use, the number of rafter legs and anchor clamps must match. It is necessary to first determine the optimal location of the elements in order to avoid overlap with the fixing points of the rafters.
Fastening the Mauerlat to aerated concrete using studs
This option is optimal for small buildings and roofs with a lightweight structure, when there are no significant loads on the roof and walls. Studs are of two types: these are bolts that form a single structure with a steel square, or L-shaped elements. Their fastening is carried out in the course of several rows to the top, while the length should be sufficient for the locknut and the thickness of the bars. The process is similar to the anchor method: the timber is put on the studs when the masonry hardens and is fixed with nuts. There are also other ways of attaching the Mauerlat to aerated concrete, but they are used less often due to their lower reliability.
Sufficient rigidity and reliability of the fastening is formed by tying the bolts to the frame and their additional brickwork with concrete. It is enough to put the Mauerlat on the studs and use the nuts to pull it to the blocks.
If it is necessary to fasten the Mauerlat to aerated concrete without an armored belt, monolithic plugs and pillows in the walls are used. Their dimensions should be within 400 mm, they are recesses with a structure made of reinforcement of small thickness or metal bars, it is on it that the anchors are fixed.
Peculiarities
The use of anchors and studs requires the preliminary creation of holes. A number of difficulties can arise here. For example, the fasteners may not be level enough, even if you use a cord and a level, it is most difficult to work with liquid concrete. First of all, the exact location of the fasteners is set, the points of the upper parts of the bolts are marked on a board with a flat surface, then they are transferred to the Mauerlat, in which the corresponding holes are drilled. Next, the beam is fixed to the wall. The base of the rafters is fixed with bolts, washers and nuts are additionally used.
Fastening the Mauerlat to aerated concrete should be carried out after choosing the fastening method and preliminary planning of the number and locations of the clamps. First of all, a reliable insulation is formed between concrete and wood. This is necessary due to the development of intensive decay of the tree; to prevent this process, a waterproofing material is used, laid in two layers. It can be both modern options and familiar ones, such as polyethylene or roofing material.
When using wire, it is enough to make holes at a distance of no more than 35 cm for all fasteners, thread the wire, while the ends are twisted in such a way as to obtain the maximum connection between the wall and the Mauerlat.
It should be noted that they should not be used with a grinder, as this tool is not suitable for wood. Failure to comply with this rule can lead to injuries during operation.
Sliding pairing
The installation of the rafters is carried out after the Mauerlat is tightly fastened. The rafter structure can be hinged or rigidly fixed, the selection of a suitable option depends on the requirements that the Mauerlat attachment points to aerated concrete must meet, the general configuration and the type of structure (suspended or layered).
The hinged version can have different mating. The most common is a rigid mating mount, with no offset and pivot capability. A sliding mate is also used to allow the beam to move and rotate in relation to the beam. The latter option reduces the expansion of the timber caused by temperature exposure and the shrinkage of the building, all this prevents the transfer of bursting loads to the wall structures.
Three techniques are used to create a sliding mate:
- the use of a special metal fastener to connect the rafters;
- bringing the beam out of the walls and fixing it with a plate;
- creating a cut in a rafter board and mounting it on a Mauerlat using a corner, staples or nails.
Hard pairing
Concrete and wooden buildings, as well as timber structures, rarely do without it. Due to the fact that both frame and timber houses are distinguished by noticeable shrinkage, in the absence of the possibility of simultaneous displacement of the building box and the roof, there is a possibility of significant stress occurring, causing damage to the structure of the walls and rafters. To create a rigid mate, support bars with a length of 1 meter are required, fixed to nails and steel corners. with a bar should abut against the Mauerlat structure in accordance with the pressure line. This prevents perpendicular displacements. Corners and nails eliminate lateral displacement, while the latter must be driven in at an angle on both sides, so that they intersect in the bar. A third nail is driven through the beam, which should have a vertical direction.
Conclusion
Fastening the Mauerlat to aerated concrete has its own characteristic features that must be taken into account when arranging, thus, problems with the operation of the roof can be prevented. In the absence of experience and relevant knowledge to create a project and the subsequent installation of a rafter system, it is advisable to turn to professionals who guarantee a reliable roof that will protect the house from cold and atmospheric precipitation for many years. During construction, it is not worth saving at this stage of work, as this can cause additional financial investments and time costs.
For the correct installation and installation of the roof truss system, the competent distribution of heavy loads on the building, builders resort to using an important element - Mauerlat. Mauerlat is a wooden or metal mount that is fixed to the top of the walls. In this case, it should be securely fastened.
If builders use metal rafters, then there is a need for an I-beam Mauerlat. It is attached to a wall made of aerated concrete without an armored belt and performs two functions:
- distributes the loads that are transmitted to the walls of the building;
- roof rafters are attached to the metal Mauerlat.
Selection of building materials
Bars are used in the manufacture of wooden Mauerlat. At the same time, experts advise making a mount from deciduous trees treated with special antiseptic agents. The bars should be laid around the perimeter of the wall. To connect them together, experts install a lock, which must be fixed with nails. This will help create a solid, solid wood structure. It is important that its size be less than the width of the aerated concrete walls. The beam must be fixed on the inner surface in such a way that there is a gap of five centimeters between the outer cut and the mount. Sometimes builders use bricks for a protective belt on the outside of the wall. Before starting the installation work, you should provide waterproofing between the walls and the beams.
Attachment types
There are ways by which you can reliably fix the Mauerlat on aerated concrete. It is necessary that the mount is installed as securely as possible - this will help to avoid displacement of the roof. In the construction industry, it is customary to fix an element using the following means:
Waterproofing during installation
Waterproofing is needed between the Mauerlat and the wall of the building. For this purpose, polyethylene, building materials in rolls or modern waterproofing agents can be used. Such work is extremely important during the construction of a building, otherwise a liquid may condense in the area of contact of materials that can destroy the Mauerlat. Protection against moisture penetration is the final stage of installation.
Nuances of installation work
As a basis, a timber with a size of 10x10 to 15x15 cm is used. Experts believe that it is preferable to install a solid wood structure around the perimeter of the wall surface. In this case, you need to fasten the wooden blocks into a single Mauerlat using a lock. Its dimensions will depend on the characteristics of the bar. After you decide on the type of fastening of the structure to aerated concrete, calculate the location and number of elements, you can begin installation. First of all, workers need to prepare the workplace by insulating the space between the Mauerlat and the concrete masonry. It is important to remember that the area of contact between wooden beams and the concrete surface is wood rotting. A waterproofing building material laid under the Mauerlat structure will help to avoid the destructive effects of moisture. For good waterproofing, two dense layers of material are used. You can use roofing material or more expensive products.
In addition, it should be borne in mind that when using studs or anchors, holes must be made in advance in the surface of aerated concrete. But this task is more difficult to solve than it might seem at first glance. The difficulty lies in the fact that the use of a building level cannot be installed in an even vertical position, especially in a liquid concrete mixture. Therefore, to begin with, it is worth determining where the bolts will be located, and how much they will deviate from the concrete. For this purpose, experts use a flat wooden board. The exact location of the bolts is marked on it. To do this, the board is applied to the extreme bolts and marks where the others should be. After that, the builders transfer the points directly to the block, drill holes according to the marked points. Then place the holes on the fixed bolts and tighten the wooden block with the nuts. With a metal wire, work is much easier. To do this, 2 holes are drilled in the bar, the distance between which should be about thirty centimeters.
Workers thread metal wire into the prepared holes, twisting the ends.
When it comes to arranging the roof, how to fix the Mauerlat to aerated concrete without an armored belt begins to interest a lot of future homeowners who have chosen gas silicate blocks for the walls. A reinforced layer between the roof and the main part of the house is definitely needed. But it is quite expensive, and it takes enough time and effort, since it is quite laborious. And if there is a workaround to go without her equipment, why not take advantage of it? You just need to know what to do in the first place for this.
How to fix the Mauerlat to aerated concrete without an armored belt, and whether to decide on this step, you can only know exactly what you are risking, and how safe your home will be as a result. And for this you need to analyze some characteristics and recommendations. Therefore, in order not to be unfounded, first we will understand the terms and purpose of individual elements of the structure.
What is Mauerlat
People who are quite far from roofing work can very vaguely imagine what the roof over their head consists of. The mysterious term "Mauerlat" does not mean anything to almost anyone, except for professional roofers. Meanwhile, it is a kind of encirclement, laid along the entire outer perimeter of the house and located between the erected walls and the roof. Its installation has 2 main goals:
- point load distribution, which is provided by the base of the rafters along all the walls of the house. Without such a distribution, the severity of the roofing system, falling on individual sections, will quickly lead to subsidence of loaded places, cracks in the thickness of the bearing wall, skewing of the roof, and in the future - its possible collapse or collapse of the house box itself;
- fastening rafters(and with them the entire roof structure) with the rest of the building. Without such a fixation, the structure will consist, as it were, of two separate parts, without forming a single whole. As you understand, in this case, there can be no talk either about reliability or about protection from external weather conditions.
Why do you need a reinforced belt?
With all the advantages of some building materials, both modern and well-known, they are certainly accompanied by some disadvantages. Gas silicate, foam concrete, aerated concrete, shell rock, expanded clay concrete have the main disadvantage - fragility and softness.
If you fix the Mauerlat directly in them, they quickly begin to collapse in the places of fixation. However, even when using durable building materials such as cinder block or brick, you should not give up the armopoyas. Especially for those whose house is being built in seismically active zones. The reasons why you should agree to his equipment (albeit gritting your teeth), you can mention the following:
- shrinkage is characteristic not only of wooden log cabins, but also of other buildings. For cellular concrete, it is especially characteristic, and it often flows unevenly along the walls. Its passage takes place without consequences for the geometry of the structure precisely due to the presence of a reinforcing belt. It also prevents deformations during seasonal soil movements;
- armopoyas increases rib stiffness and its strength throughout the entire box of the house;
- if anyone does not know, the rafters exert bursting pressure on the walls. It is especially high in winter, when an additional mass of snow and freezing of ice in the form of icicles are added to the weight of the roof (moreover, these precipitations can significantly increase the weight of the structure). The reinforcing belt helps the walls resist expansion more effectively.
- And all these arguments are complemented by the ability to more reliably and simply fix roof structures on the walls.
How to do without an armopoyas?
If there is absolutely no way to equip such a useful gasket, builders can only suggest 2 ways in which this step can be ignored.
Steel wire, woven into the walls, largely replaces the reinforcing belt. A series of 3-4 to the top of the wall along the entire perimeter between the aerated concrete blocks, a wire segment is embedded. It should be fastened starting from the middle, and the length is calculated in such a way that it is enough to pull the Mauerlat bar to the top of the wall. To fix the Mauerlat element, a hole is made in the bar. The number of ligaments is not limited, but in most cases it corresponds to the number of rafter legs.
A chemical anchor, also called glued, liquid, and also injection mass, is recognized as more durable. In a rough description, it consists of 2 parts: a metal rod and a synthetic-polymer adhesive mass. Its main difference from its mechanical counterpart is the absence of bursting tension created by the hardware itself. An ordinary anchor is held in the material to be fastened exclusively due to friction and expansion, while the chemical one penetrates into the pores of aerated concrete, fastening it tightly to the hardware.
Roughly speaking, even a piece of reinforcement can be used as a bar. The main thing for the success of undertakings is to drill a sufficiently deep hole under the anchor, 2-3 layers of masonry. High humidity is not an obstacle for the use of chemical anchors - even work under water. The service life of such fasteners is determined by the manufacturer at half a century.
The only limitation, if you decide to prefer this method, how to fix the Mauerlat to aerated concrete without an armored belt - nothing can be welded to chemical anchors. Welding a rod with any other object leads to the destruction of the resins that make up the mass, after which it is useless to expect any strength from the fastener.
Mauerlat is a special wooden, less often metal, structural element of the roof. It is necessary for even distribution of the roof pressure on the bearing supports, as well as for attaching the rafter frame to the aerated concrete wall. The reliability and durability of the entire structure depends on how accurate and strong the connection of the support will be.
Mauerlat should be correctly performed from a log or bar of at least 10x10 cm in size, treated with aseptic solutions, dried, without cracks and knots. If raw wood is used, then a prerequisite is the presence of an anchor adjusting nut, which subsequently must be tightened once a year for 5 consecutive years.
Rarely, it is allowed to use a channel or a beam for construction, but in this case, the rafters must be metal, and the load on aerated concrete increases significantly, and reinforced fastenings are mainly needed, and the cost of such a project will not fit into every budgetary framework.
Mounting Guide
Initially, in order to evenly distribute pressure on the building frame, a reinforced concrete strapping belt is erected to avoid pushing the aerated concrete. It is a concrete tape with dimensions of 20x15 cm, running along the entire perimeter of the aerated concrete wall.
A reinforcing belt is constructed according to the following scheme:
- Assembling the formwork along the top of the wall.
- Placement of U-shaped blocks inside the timber frame.
- Reinforcement with rods 10 mm.
- Installation of studs with a thread with a diameter of 14 mm, tied into the reinforcement cage, for reliable installation of the Mauerlat at a distance of 1 m from each other.
- Filling of molds with concrete M-200 mortar.
An important point in the technology for preparing fasteners is the calculation of the number of studs and their location. The number of rafter legs and fasteners must be the same. They are installed in such a way that they do not intersect with the connection points of the Mauerlat with the rafter system. The height is selected taking into account the size of the bar plus 4 cm.
After a week, the formwork is removed and the belt is ready for further work. Fasteners are embedded in the concrete, bonding to the reinforcement cage, providing the most reliable connection possible. A bar is applied to the studs, and the attachment points are imprinted on the latter with blows of a sledgehammer. Holes of the required diameter are drilled. The Mauerlat fits snugly onto the fasteners and is fixed with washers and nuts.
There are options when, instead of a reinforcing belt, a so-called monolithic pillow is assembled. Its length, as a rule, is not more than 40 cm, and also contains a reinforcing cage with a tied anchor, poured with a concrete mixture. This feature is typical mainly for brick walls.
How to properly mount a Mauerlat without an armored belt?
If the construction of a reinforcing belt is almost impossible, then fastening to the wall of a one-story house made of aerated concrete is carried out without it.
There are several types of fasteners that it is quite possible to do with your own hands using:
- steel wire;
- anchors;
- studs;
- dowels.
Also, the subsequent fastening of the Mauerlat to aerated concrete can be carried out in two ways:
1. Mechanical - using bolts with thread M 12-14 and dowels with special harpoons. After screwing the elements into the base, the dowel parts expand in the cellular blocks of aerated concrete, firmly seizing inside. The negative side of this method is the high cost of hardware.
2. Chemical - special capsules with a polymer resin adhesive are used. This option is more affordable. The essence of the method lies in the fact that the chemical reagent, spreading in the pores of aerated concrete, firmly grabs the metal rod with the wall. In this case, the prepared hole should be 2-3 layers of masonry deep.
A chemical anchor provides a more durable connection than a mechanical one. Such are suitable for use in thin-walled structures, since they do not give expansion. Thus, additional hydro and thermal insulation of aerated concrete is provided. The only drawback is the impossibility of carrying out welding work, if necessary, due to the destruction of the polymer resin under the influence of high temperatures.
The best mounting option without an armored belt and the simplest is steel wire. In this case, the scheme of actions is as follows: 3-4 rows of blocks to the edge of the wall, it folds in half and is threaded under the bricks so that the ends come out freely. The length of the string is calculated with a margin so that it is enough to thread it through the drilled holes in the bar at a distance of 25-30 cm and twist it together as tightly as possible. The number of straps must match the number of rafters.
Anchoring is used in the absence of a reinforcing belt, but is most often used in conjunction with its construction. Then the installation technology will differ by replacing the concreted studs with the installation of anchors with harpoon dowels after the mortar has set or with a tie in a reinforcing cage.
Fastening with studs is performed when the structure and the roof are small and the pressure on the support does not imply large loads. Independently, this process is carried out using bolts or special metal L-shaped or T-shaped rods with a length of at least 1 m and a diameter of 8-24 mm. Such steel elements are embedded in the wall 2-3 rows of masonry to the upper edge.
Important: the deepening of the rod is carried out by an amount equal to two heights of the Mauerlat. After the masonry has hardened, a bar is put on and attracted by nuts to the aerated concrete.
The instruction for fastening the support with dowels implies the use of wooden plugs, pre-treated with moisture-proof agents. Such devices are mounted in a wall of aerated concrete or fixed under the timber itself. Mauerlat is fixed with metal staples. The number of fasteners should be equal to the number of rafters.
Tips and general instructions
1.creation of an additional stiffness axis;
2. obstacle to deformation and violation of the geometry of the structure during seasonal shrinkage;
3. leveling the surface of the walls horizontally, for example, with uneven masonry;
4. Uniform distribution of the static load on the building frame.
When using studs and anchors, it is important to properly prepare the holes. Align a strict vertical for a secure fit. Especially for the chemical method of setting, where after drilling it is necessary to thoroughly clean and rinse the holes for a better setting of the reagent. In some cases, a cone-shaped expansion is created with a drill for the entry of a larger amount of adhesive mass and, accordingly, a stronger connection.
One of the important conditions: before fastening the wooden support, waterproofing made of bitumen-polymer material is laid. Roofing material in this case is used less often, like plastic film. The fact is that when materials come into contact with wood - concrete, an active process of decay of the wooden component occurs. For this reason, it is recommended to lay the Mauerlat with modern waterproofing materials in two layers.
It is quite problematic to carry out work on the construction of the roofing system, to securely fasten the structure to the aerated concrete wall, especially in the absence of proper experience in construction. Therefore, it is better to entrust such events, starting with the design of the future roof, to professional contractors.
Mounting the Mauerlat is not difficult, but it requires some skills and accurate calculations. A competent owner may well cope with this on his own. Let's try to figure out what and how best to fix the Mauerlat to aerated concrete, and also talk about the importance of waterproofing.
What is the Mauerlat mount
In the process of building a house, special attention is paid to Mauerlat - it is entrusted with an important mission in the construction of the roof. The rafter system gives a very large load on the walls, in order to avoid this, beams are installed around the perimeter, and the rafter legs are already attached to them - thus, the load is evenly distributed on the walls of the house.
Fixing the Mauerlat can be done in three ways, using - studs, anchors or steel wire. Usually the method depends on the overall dimensions of the building or house. Experts have long come to the unanimous opinion that fastening the Mauerlat to aerated concrete should be accompanied by the creation of an armored belt. Then the structure will be ideally strong and rigid, less prone to shrinkage.
Since the wooden logs of the Mauerlat are responsible for the reliable fixation of the rafter beams, they must be secured as efficiently and powerfully as possible. Otherwise, they will not be able to take on some of the load properly.
Parameters of a suitable bar for the role of Mauerlat
Planks of deciduous trees (most often oak) are well suited for this. The recommended size is 10x10, or more - 15x15. Be sure to treat the wood with an antiseptic to protect it from decay. With the help of a direct lock and additional nails for reliability, the Mauerlat is fastened together, evenly covering the top of the walls.
Important: it happens that you have to take "raw" wood, in such cases, do not forget that for 5 years you will need to tighten the anchor nut annually due to frequent shrinkage of wood - take care of the possibility of adjusting it. Over time, this will not be necessary.
Before installing the Mauerlat, the top of the walls must be covered with a layer of waterproofing, otherwise, upon contact with the wall surface, the tree will begin to deteriorate. For this, you can use ordinary roofing material, but modern builders still do not recommend it - it is better to choose a high-quality bitumen-polymer material. It will provide more reliable waterproofing.
Fastening with anchors
It is this mount that is used with the armored belt - together they create 
very robust and reliable construction. Armopoyas is a kind of frame made of 12 mm reinforcement, which fits into a special groove.
What you need:
Concrete grade M-200
U-shaped blocks - they will be a receptacle for reinforcement and concrete
Reinforcement with a thickness of 10-12 mm to create a frame.
Rods 6 mm thick, for transverse intersections of the armopoyas
U-blocks will help you lay out the groove on the surface of the walls without resorting to chipping aerated concrete - just install the blocks along the upper edge of the walls.
You should have a continuous "ditch" - for this you need to put blocks with sawn sides in the corners.
Then, in the resulting groove, install a reinforced belt.
Attach a threaded anchor to the belt, for this use a wire, and as a guide - pull a fishing line or thick thread.
Now you can fill it all with concrete.
After the concrete is dry, apply a waterproofing layer.
Important: the anchors should protrude beyond the concrete - you will put on the Mauerlat on them. The pouring of the concrete mixture should take place without interruption, so to speak, in one go at once the right amount.
Despite the existence of other methods of attachment to aerated concrete, the use of a reinforced belt cannot be compared with any other in terms of quality and power.
Metal studs - where this type of fastening is appropriate
This option is good for very small houses or other buildings where there is no strong load on the walls made of aerated concrete. Well, or for some reason there is no way to build an armored belt. In other cases, metal studs are rather weak and do not withstand excessive pressure, therefore experts do not advise using them to mount the Mauerlat on the walls of large buildings.
Stages of work:
To insert studs into aerated concrete, you must drill holes in it with a distance of one to one and a half meters.
Insert the CPT 12 studs into the aerated concrete.
Then the hairpin must be filled with a solution.
Before putting the Mauerlat on the studs, install a layer of waterproofing - you can use roofing material, but as mentioned above, it is better to use a more modern material.
Lay the Mauerlat timber on the insulation, pushing it onto the washers.
Tighten the nuts.
At the junction, the Mauerlat is pulled together with staples.
Important: it happens that during the work there are already gables - it is better to remove them. Lay the bars along the edges of the walls, then saw off the rafter legs - in this way, it will be possible to redirect the spacer from the rafter to the bar.
Fastening the Mauerlat with a wire without an armored belt
This method is much simpler than the first two, but less durable and strong - it is well suited where you need to fix the Mauerlat to aerated concrete as quickly as possible. Used in the construction of small, simple buildings. If, in the method with construction studs, an armo-belt is installed if necessary, then everything happens without it in any case. Its advantage is that you only need steel wire for work.
Work process:
At the stage of erecting walls when laying aerated concrete blocks, you need to push the wire between the joints of the bricks, and wedge it in. This should be done so that its middle is tightly fixed in blocks. It is advisable to start mounting the wire somewhere three to four rows before the completion of the wall.
The steel wire should be long. Keep in mind that part of it will be under the bricks, and the ends should penetrate into the hole in the beam, braid it, and then they must be tightly tightened and secured. Thus, the Mauerlat will be able to quite confidently hold the entire structure of the rafter system, taking some of the load from the walls onto itself.
Do not forget that the Mauerlat must be fastened in such a way that there is at least 5 cm free space between the beams and the outer edge of the wall.
Wooden boards need to be sanded well so that there are no cracks or knots.
Waterproofing is one of the important points - if it is not laid, then moisture will form between the wood and aerated concrete, and it will ruin the timber very quickly.
Raw wood is allowed, but must comply with building codes.
As you can see, attaching the Mauerlat to aerated concrete without an armored belt or with it is not so difficult as it might seem at first glance. But in any case, it will be useful to consult with an experienced builder.